form_with/fields: Don't output ids by default

Continuing 67f81cc where we decided not to output ids
by default in the new form helpers.

Went with @dhh's suggestion of just requiring ids on
fields being labelled:
https://github.com/rails/rails/issues/25197#issuecomment-231797117

Seems okay enough.

4 files changed, 243 insertions, 206 deletions

diff --git a/actionview/lib/action_view/helpers/form_helper.rb b/actionview/lib/action_view/helpers/form_helper.rb
index e7ea267211..55389950ed 100644
--- a/actionview/lib/action_view/helpers/form_helper.rb
+++ b/actionview/lib/action_view/helpers/form_helper.rb
@@ -595,6 +595,16 @@ module ActionView
       #
       # Where <tt>@document = Document.find(params[:id])</tt>.
       #
+      # When using labels +form_with+ requires setting the id on the field being
+      # labelled:
+      #
+      #   <%= form_with(model: @post) do |form| %>
+      #     <%= form.label :title %>
+      #     <%= form.text_field :title, id: :post_title %>
+      #   <% end %>
+      #
+      # See +label+ for more on how the +for+ attribute is derived.
+      #
       # === Mixing with other form helpers
       #
       # While +form_with+ uses a FormBuilder object it's possible to mix and
@@ -690,6 +700,8 @@ module ActionView
       #     form_with(**options.merge(builder: LabellingFormBuilder), &block)
       #   end
       def form_with(model: nil, scope: nil, url: nil, format: nil, **options)
+        options[:skip_default_ids] = true
+
         if model
           url ||= polymorphic_path(model, format: format)
 
@@ -986,6 +998,16 @@ module ActionView
       # or model is yielded, so any generated field names are prefixed with
       # either the passed scope or the scope inferred from the <tt>:model</tt>.
       #
+      # When using labels +fields+ requires setting the id on the field being
+      # labelled:
+      #
+      #   <%= fields :comment do |fields| %>
+      #     <%= fields.label :body %>
+      #     <%= fields.text_field :body, id: :comment_body %>
+      #   <% end %>
+      #
+      # See +label+ for more on how the +for+ attribute is derived.
+      #
       # === Mixing with other form helpers
       #
       # While +form_with+ uses a FormBuilder object it's possible to mix and
@@ -1003,7 +1025,8 @@ module ActionView
       # to work with an object as a base, like
       # FormOptionHelper#collection_select and DateHelper#datetime_select.
       def fields(scope = nil, model: nil, **options, &block)
-        # TODO: Remove when ids and classes are no longer output by default.
+        options[:skip_default_ids] = true
+
         if model
           scope ||= model_name_from_record_or_class(model).param_key
         end
@@ -1469,7 +1492,7 @@ module ActionView
       private
         def html_options_for_form_with(url_for_options = nil, model = nil, html: {}, local: false,
           skip_enforcing_utf8: false, **options)
-          html_options = options.except(:index, :include_id, :builder).merge(html)
+          html_options = options.except(:index, :include_id, :skip_default_ids, :builder).merge(html)
           html_options[:method] ||= :patch if model.respond_to?(:persisted?) && model.persisted?
           html_options[:enforce_utf8] = !skip_enforcing_utf8
 
@@ -1603,7 +1626,7 @@ module ActionView
       def initialize(object_name, object, template, options)
         @nested_child_index = {}
         @object_name, @object, @template, @options = object_name, object, template, options
-        @default_options = @options ? @options.slice(:index, :namespace) : {}
+        @default_options = @options ? @options.slice(:index, :namespace, :skip_default_ids) : {}
 
         convert_to_legacy_options(@options)
 
@@ -1910,6 +1933,8 @@ module ActionView
 
       # See the docs for the <tt>ActionView::FormHelper.fields</tt> helper method.
       def fields(scope = nil, model: nil, **options, &block)
+        options[:skip_default_ids] = true
+
         convert_to_legacy_options(options)
 
         fields_for(scope || model, model, **options, &block)
diff --git a/actionview/lib/action_view/helpers/tags/base.rb b/actionview/lib/action_view/helpers/tags/base.rb
index cf8a6d6028..b8c446cbed 100644
--- a/actionview/lib/action_view/helpers/tags/base.rb
+++ b/actionview/lib/action_view/helpers/tags/base.rb
@@ -13,6 +13,7 @@ module ActionView
 
           @object_name.sub!(/\[\]$/, "") || @object_name.sub!(/\[\]\]$/, "]")
           @object = retrieve_object(options.delete(:object))
+          @skip_default_ids = options.delete(:skip_default_ids)
           @options = options
           @auto_index = Regexp.last_match ? retrieve_autoindex(Regexp.last_match.pre_match) : nil
         end
@@ -81,9 +82,12 @@ module ActionView
           def add_default_name_and_id(options)
             index = name_and_id_index(options)
             options["name"] = options.fetch("name") { tag_name(options["multiple"], index) }
-            options["id"] = options.fetch("id") { tag_id(index) }
-            if namespace = options.delete("namespace")
-              options["id"] = options["id"] ? "#{namespace}_#{options['id']}" : namespace
+
+            unless skip_default_ids?
+              options["id"] = options.fetch("id") { tag_id(index) }
+              if namespace = options.delete("namespace")
+                options["id"] = options["id"] ? "#{namespace}_#{options['id']}" : namespace
+              end
             end
           end
 
@@ -154,6 +158,10 @@ module ActionView
           def name_and_id_index(options)
             options.key?("index") ? options.delete("index") || "" : @auto_index
           end
+
+          def skip_default_ids?
+            @skip_default_ids
+          end
       end
     end
   end
diff --git a/actionview/lib/action_view/helpers/tags/label.rb b/actionview/lib/action_view/helpers/tags/label.rb
index b31d5fda66..cab15ae201 100644
--- a/actionview/lib/action_view/helpers/tags/label.rb
+++ b/actionview/lib/action_view/helpers/tags/label.rb
@@ -73,6 +73,10 @@ module ActionView
           def render_component(builder)
             builder.translation
           end
+
+          def skip_default_ids?
+            false # The id is used as the `for` attribute.
+          end
       end
     end
   end
diff --git a/actionview/test/template/form_helper/form_with_test.rb b/actionview/test/template/form_helper/form_with_test.rb
index c80a2f61b9..4efc93ca08 100644
--- a/actionview/test/template/form_helper/form_with_test.rb
+++ b/actionview/test/template/form_helper/form_with_test.rb
@@ -301,10 +301,10 @@ class FormWithActsLikeFormForTest < FormWithTest
 
     expected = whole_form("/posts/123", "create-post", method: "patch") do
       "<label for='post_title'>The Title</label>" +
-      "<input name='post[title]' type='text' id='post_title' value='Hello World' />" +
-      "<textarea name='post[body]' id='post_body'>\nBack to the hill and over it again!</textarea>" +
+      "<input name='post[title]' type='text' value='Hello World' />" +
+      "<textarea name='post[body]'>\nBack to the hill and over it again!</textarea>" +
       "<input name='post[secret]' type='hidden' value='0' />" +
-      "<input name='post[secret]' checked='checked' type='checkbox' id='post_secret' value='1' />" +
+      "<input name='post[secret]' checked='checked' type='checkbox' value='1' />" +
       "<input name='commit' data-disable-with='Create post' type='submit' value='Create post' />" +
       "<button name='button' type='submit'>Create post</button>" +
       "<button name='button' type='submit'><span>Create post</span></button>"
@@ -322,9 +322,9 @@ class FormWithActsLikeFormForTest < FormWithTest
 
     expected = whole_form("/posts") do
       "<input type='hidden' name='post[active]' value='' />" +
-      "<input id='post_active_true' name='post[active]' type='radio' value='true' />" +
+      "<input name='post[active]' type='radio' value='true' />" +
       "<label for='post_active_true'>true</label>" +
-      "<input checked='checked' id='post_active_false' name='post[active]' type='radio' value='false' />" +
+      "<input checked='checked' name='post[active]' type='radio' value='false' />" +
       "<label for='post_active_false'>false</label>"
     end
 
@@ -345,10 +345,10 @@ class FormWithActsLikeFormForTest < FormWithTest
     expected = whole_form("/posts") do
       "<input type='hidden' name='post[active]' value='' />" +
       "<label for='post_active_true'>" +
-      "<input id='post_active_true' name='post[active]' type='radio' value='true' />" +
+      "<input name='post[active]' type='radio' value='true' />" +
       "true</label>" +
       "<label for='post_active_false'>" +
-      "<input checked='checked' id='post_active_false' name='post[active]' type='radio' value='false' />" +
+      "<input checked='checked' name='post[active]' type='radio' value='false' />" +
       "false</label>"
     end
 
@@ -371,12 +371,12 @@ class FormWithActsLikeFormForTest < FormWithTest
     expected = whole_form("/posts") do
       "<input type='hidden' name='post[active]' value='' />" +
       "<label for='post_active_true'>" +
-      "<input id='post_active_true' name='post[active]' type='radio' value='true' />" +
+      "<input name='post[active]' type='radio' value='true' />" +
       "true</label>" +
       "<label for='post_active_false'>" +
-      "<input checked='checked' id='post_active_false' name='post[active]' type='radio' value='false' />" +
+      "<input checked='checked' name='post[active]' type='radio' value='false' />" +
       "false</label>" +
-      "<input id='post_id' name='post[id]' type='hidden' value='1' />"
+      "<input name='post[id]' type='hidden' value='1' />"
     end
 
     assert_dom_equal expected, output_buffer
@@ -392,9 +392,9 @@ class FormWithActsLikeFormForTest < FormWithTest
 
     expected = whole_form("/posts") do
       "<input type='hidden' name='post[1][active]' value='' />" +
-      "<input id='post_1_active_true' name='post[1][active]' type='radio' value='true' />" +
+      "<input name='post[1][active]' type='radio' value='true' />" +
       "<label for='post_1_active_true'>true</label>" +
-      "<input checked='checked' id='post_1_active_false' name='post[1][active]' type='radio' value='false' />" +
+      "<input checked='checked' name='post[1][active]' type='radio' value='false' />" +
       "<label for='post_1_active_false'>false</label>"
     end
 
@@ -411,11 +411,11 @@ class FormWithActsLikeFormForTest < FormWithTest
 
     expected = whole_form("/posts") do
       "<input name='post[tag_ids][]' type='hidden' value='' />" +
-      "<input checked='checked' id='post_tag_ids_1' name='post[tag_ids][]' type='checkbox' value='1' />" +
+      "<input checked='checked' name='post[tag_ids][]' type='checkbox' value='1' />" +
       "<label for='post_tag_ids_1'>Tag 1</label>" +
-      "<input id='post_tag_ids_2' name='post[tag_ids][]' type='checkbox' value='2' />" +
+      "<input name='post[tag_ids][]' type='checkbox' value='2' />" +
       "<label for='post_tag_ids_2'>Tag 2</label>" +
-      "<input checked='checked' id='post_tag_ids_3' name='post[tag_ids][]' type='checkbox' value='3' />" +
+      "<input checked='checked' name='post[tag_ids][]' type='checkbox' value='3' />" +
       "<label for='post_tag_ids_3'>Tag 3</label>"
     end
 
@@ -436,13 +436,13 @@ class FormWithActsLikeFormForTest < FormWithTest
     expected = whole_form("/posts") do
       "<input name='post[tag_ids][]' type='hidden' value='' />" +
       "<label for='post_tag_ids_1'>" +
-      "<input checked='checked' id='post_tag_ids_1' name='post[tag_ids][]' type='checkbox' value='1' />" +
+      "<input checked='checked' name='post[tag_ids][]' type='checkbox' value='1' />" +
       "Tag 1</label>" +
       "<label for='post_tag_ids_2'>" +
-      "<input id='post_tag_ids_2' name='post[tag_ids][]' type='checkbox' value='2' />" +
+      "<input name='post[tag_ids][]' type='checkbox' value='2' />" +
       "Tag 2</label>" +
       "<label for='post_tag_ids_3'>" +
-      "<input checked='checked' id='post_tag_ids_3' name='post[tag_ids][]' type='checkbox' value='3' />" +
+      "<input checked='checked' name='post[tag_ids][]' type='checkbox' value='3' />" +
       "Tag 3</label>"
     end
 
@@ -466,15 +466,15 @@ class FormWithActsLikeFormForTest < FormWithTest
     expected = whole_form("/posts") do
       "<input name='post[tag_ids][]' type='hidden' value='' />" +
       "<label for='post_tag_ids_1'>" +
-      "<input checked='checked' id='post_tag_ids_1' name='post[tag_ids][]' type='checkbox' value='1' />" +
+      "<input checked='checked' name='post[tag_ids][]' type='checkbox' value='1' />" +
       "Tag 1</label>" +
       "<label for='post_tag_ids_2'>" +
-      "<input id='post_tag_ids_2' name='post[tag_ids][]' type='checkbox' value='2' />" +
+      "<input name='post[tag_ids][]' type='checkbox' value='2' />" +
       "Tag 2</label>" +
       "<label for='post_tag_ids_3'>" +
-      "<input checked='checked' id='post_tag_ids_3' name='post[tag_ids][]' type='checkbox' value='3' />" +
+      "<input checked='checked' name='post[tag_ids][]' type='checkbox' value='3' />" +
       "Tag 3</label>" +
-      "<input id='post_id' name='post[id]' type='hidden' value='1' />"
+      "<input name='post[id]' type='hidden' value='1' />"
     end
 
     assert_dom_equal expected, output_buffer
@@ -491,7 +491,7 @@ class FormWithActsLikeFormForTest < FormWithTest
 
     expected = whole_form("/posts") do
       "<input name='post[1][tag_ids][]' type='hidden' value='' />" +
-      "<input checked='checked' id='post_1_tag_ids_1' name='post[1][tag_ids][]' type='checkbox' value='1' />" +
+      "<input checked='checked' name='post[1][tag_ids][]' type='checkbox' value='1' />" +
       "<label for='post_1_tag_ids_1'>Tag 1</label>"
     end
 
@@ -506,7 +506,7 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", "create-post", method: "patch", multipart: true) do
-      "<input name='post[file]' type='file' id='post_file' />"
+      "<input name='post[file]' type='file' />"
     end
 
     assert_dom_equal expected, output_buffer
@@ -522,7 +522,7 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch", multipart: true) do
-      "<input name='post[comment][file]' type='file' id='post_comment_file' />"
+      "<input name='post[comment][file]' type='file' />"
     end
 
     assert_dom_equal expected, output_buffer
@@ -561,7 +561,7 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/44", method: "patch") do
-      "<input name='post[title]' type='text' id='post_title' value='And his name will be forty and four.' />" +
+      "<input name='post[title]' type='text' value='And his name will be forty and four.' />" +
       "<input name='commit' data-disable-with='Edit post' type='submit' value='Edit post' />"
     end
 
@@ -579,10 +579,10 @@ class FormWithActsLikeFormForTest < FormWithTest
 
     expected = whole_form("/posts/123", "create-post", method: "patch") do
       "<label for='other_name_title' class='post_title'>Title</label>" +
-      "<input name='other_name[title]' id='other_name_title' value='Hello World' type='text' />" +
-      "<textarea name='other_name[body]' id='other_name_body'>\nBack to the hill and over it again!</textarea>" +
+      "<input name='other_name[title]' value='Hello World' type='text' />" +
+      "<textarea name='other_name[body]'>\nBack to the hill and over it again!</textarea>" +
       "<input name='other_name[secret]' value='0' type='hidden' />" +
-      "<input name='other_name[secret]' checked='checked' id='other_name_secret' value='1' type='checkbox' />" +
+      "<input name='other_name[secret]' checked='checked' value='1' type='checkbox' />" +
       "<input name='commit' value='Create post' data-disable-with='Create post' type='submit' />"
     end
 
@@ -609,10 +609,10 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/", "create-post", method: "delete") do
-      "<input name='post[title]' type='text' id='post_title' value='Hello World' />" +
-      "<textarea name='post[body]' id='post_body'>\nBack to the hill and over it again!</textarea>" +
+      "<input name='post[title]' type='text' value='Hello World' />" +
+      "<textarea name='post[body]'>\nBack to the hill and over it again!</textarea>" +
       "<input name='post[secret]' type='hidden' value='0' />" +
-      "<input name='post[secret]' checked='checked' type='checkbox' id='post_secret' value='1' />"
+      "<input name='post[secret]' checked='checked' type='checkbox' value='1' />"
     end
 
     assert_dom_equal expected, output_buffer
@@ -626,10 +626,10 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/", "create-post", method: "delete") do
-      "<input name='post[title]' type='text' id='post_title' value='Hello World' />" +
-      "<textarea name='post[body]' id='post_body'>\nBack to the hill and over it again!</textarea>" +
+      "<input name='post[title]' type='text' value='Hello World' />" +
+      "<textarea name='post[body]'>\nBack to the hill and over it again!</textarea>" +
       "<input name='post[secret]' type='hidden' value='0' />" +
-      "<input name='post[secret]' checked='checked' type='checkbox' id='post_secret' value='1' />"
+      "<input name='post[secret]' checked='checked' type='checkbox' value='1' />"
     end
 
     assert_dom_equal expected, output_buffer
@@ -643,7 +643,7 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/search", "search-post", method: "get") do
-      "<input name='post[title]' type='search' id='post_title' />"
+      "<input name='post[title]' type='search' />"
     end
 
     assert_dom_equal expected, output_buffer
@@ -657,10 +657,10 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/", "create-post", method: "patch") do
-      "<input name='post[title]' type='text' id='post_title' value='Hello World' />" +
-      "<textarea name='post[body]' id='post_body'>\nBack to the hill and over it again!</textarea>" +
+      "<input name='post[title]' type='text' value='Hello World' />" +
+      "<textarea name='post[body]'>\nBack to the hill and over it again!</textarea>" +
       "<input name='post[secret]' type='hidden' value='0' />" +
-      "<input name='post[secret]' checked='checked' type='checkbox' id='post_secret' value='1' />"
+      "<input name='post[secret]' checked='checked' type='checkbox' value='1' />"
     end
 
     assert_dom_equal expected, output_buffer
@@ -672,7 +672,7 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/", skip_enforcing_utf8: true) do
-      "<input name='post[title]' type='text' id='post_title' value='Hello World' />"
+      "<input name='post[title]' type='text' value='Hello World' />"
     end
 
     assert_dom_equal expected, output_buffer
@@ -684,7 +684,7 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/", skip_enforcing_utf8: false) do
-      "<input name='post[title]' type='text' id='post_title' value='Hello World' />"
+      "<input name='post[title]' type='text' value='Hello World' />"
     end
 
     assert_dom_equal expected, output_buffer
@@ -698,10 +698,10 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/", "create-post") do
-      "<input name='post[title]' type='text' id='post_title' value='Hello World' />" +
-      "<textarea name='post[body]' id='post_body'>\nBack to the hill and over it again!</textarea>" +
+      "<input name='post[title]' type='text' value='Hello World' />" +
+      "<textarea name='post[body]'>\nBack to the hill and over it again!</textarea>" +
       "<input name='post[secret]' type='hidden' value='0' />" +
-      "<input name='post[secret]' checked='checked' type='checkbox' id='post_secret' value='1' />"
+      "<input name='post[secret]' checked='checked' type='checkbox' value='1' />"
     end
 
     assert_dom_equal expected, output_buffer
@@ -717,10 +717,10 @@ class FormWithActsLikeFormForTest < FormWithTest
 
     expected = whole_form("/posts/123", method: "patch") do
       "<label for='post_123_title'>Title</label>" +
-      "<input name='post[123][title]' type='text' id='post_123_title' value='Hello World' />" +
-      "<textarea name='post[123][body]' id='post_123_body'>\nBack to the hill and over it again!</textarea>" +
+      "<input name='post[123][title]' type='text' value='Hello World' />" +
+      "<textarea name='post[123][body]'>\nBack to the hill and over it again!</textarea>" +
       "<input name='post[123][secret]' type='hidden' value='0' />" +
-      "<input name='post[123][secret]' checked='checked' type='checkbox' id='post_123_secret' value='1' />"
+      "<input name='post[123][secret]' checked='checked' type='checkbox' value='1' />"
     end
 
     assert_dom_equal expected, output_buffer
@@ -734,10 +734,10 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      "<input name='post[][title]' type='text' id='post__title' value='Hello World' />" +
-      "<textarea name='post[][body]' id='post__body'>\nBack to the hill and over it again!</textarea>" +
+      "<input name='post[][title]' type='text' value='Hello World' />" +
+      "<textarea name='post[][body]'>\nBack to the hill and over it again!</textarea>" +
       "<input name='post[][secret]' type='hidden' value='0' />" +
-      "<input name='post[][secret]' checked='checked' type='checkbox' id='post__secret' value='1' />"
+      "<input name='post[][secret]' checked='checked' type='checkbox' value='1' />"
     end
 
     assert_dom_equal expected, output_buffer
@@ -752,7 +752,7 @@ class FormWithActsLikeFormForTest < FormWithTest
 
     expected = whole_form("/posts/123", method: "patch") do
       "<div class='field_with_errors'><label for='post_author_name' class='label'>Author name</label></div>" +
-      "<div class='field_with_errors'><input name='post[author_name]' type='text' id='post_author_name' value='' /></div>" +
+      "<div class='field_with_errors'><input name='post[author_name]' type='text' value='' /></div>" +
       "<input name='commit' data-disable-with='Create post' type='submit' value='Create post' />"
     end
 
@@ -770,7 +770,7 @@ class FormWithActsLikeFormForTest < FormWithTest
 
     expected = whole_form("/posts/123", method: "patch") do
       "<div class='field_with_errors'><label for='post_author_name' class='label'>Author name</label></div>" +
-      "<div class='field_with_errors'><input name='post[author_name]' type='text' id='post_author_name' value='' /></div>" +
+      "<div class='field_with_errors'><input name='post[author_name]' type='text' value='' /></div>" +
       "<input name='commit' data-disable-with='Create post' type='submit' value='Create post' />"
     end
 
@@ -800,10 +800,10 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", "namespace_edit_post_123", "edit_post", method: "patch") do
-      "<input name='post[title]' type='text' id='namespace_post_title' value='Hello World' />" +
-      "<textarea name='post[body]' id='namespace_post_body'>\nBack to the hill and over it again!</textarea>" +
+      "<input name='post[title]' type='text' value='Hello World' />" +
+      "<textarea name='post[body]'>\nBack to the hill and over it again!</textarea>" +
       "<input name='post[secret]' type='hidden' value='0' />" +
-      "<input name='post[secret]' checked='checked' type='checkbox' id='namespace_post_secret' value='1' />"
+      "<input name='post[secret]' checked='checked' type='checkbox' value='1' />"
     end
 
     assert_dom_equal expected, output_buffer
@@ -877,7 +877,7 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      "<input name='post[comment][body]' type='text' id='post_comment_body' value='Hello World' />"
+      "<input name='post[comment][body]' type='text' value='Hello World' />"
     end
 
     assert_dom_equal expected, output_buffer
@@ -897,7 +897,7 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form do
-      "<input name='posts[post][0][comment][1][name]' type='text' id='posts_post_0_comment_1_name' value='comment #1' />"
+      "<input name='posts[post][0][comment][1][name]' type='text' value='comment #1' />"
     end
 
     assert_dom_equal expected, output_buffer
@@ -912,8 +912,8 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      "<input name='post[123][title]' type='text' id='post_123_title' value='Hello World' />" +
-      "<input name='post[123][comment][][name]' type='text' id='post_123_comment__name' value='new comment' />"
+      "<input name='post[123][title]' type='text' value='Hello World' />" +
+      "<input name='post[123][comment][][name]' type='text' value='new comment' />"
     end
 
     assert_dom_equal expected, output_buffer
@@ -928,8 +928,8 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      "<input name='post[1][title]' type='text' id='post_1_title' value='Hello World' />" +
-      "<input name='post[1][comment][1][name]' type='text' id='post_1_comment_1_name' value='new comment' />"
+      "<input name='post[1][title]' type='text' value='Hello World' />" +
+      "<input name='post[1][comment][1][name]' type='text' value='new comment' />"
     end
 
     assert_dom_equal expected, output_buffer
@@ -943,7 +943,7 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      "<input name='post[1][comment][title]' type='text' id='post_1_comment_title' value='Hello World' />"
+      "<input name='post[1][comment][title]' type='text' value='Hello World' />"
     end
 
     assert_dom_equal expected, output_buffer
@@ -957,7 +957,7 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      "<input name='post[1][comment][5][title]' type='text' id='post_1_comment_5_title' value='Hello World' />"
+      "<input name='post[1][comment][5][title]' type='text' value='Hello World' />"
     end
 
     assert_dom_equal expected, output_buffer
@@ -971,7 +971,7 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      "<input name='post[123][comment][title]' type='text' id='post_123_comment_title' value='Hello World' />"
+      "<input name='post[123][comment][title]' type='text' value='Hello World' />"
     end
 
     assert_dom_equal expected, output_buffer
@@ -985,7 +985,7 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      "<input name='post[comment][5][title]' type='radio' id='post_comment_5_title_hello' value='hello' />"
+      "<input name='post[comment][5][title]' type='radio' value='hello' />"
     end
 
     assert_dom_equal expected, output_buffer
@@ -999,7 +999,7 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      "<input name='post[123][comment][123][title]' type='text' id='post_123_comment_123_title' value='Hello World' />"
+      "<input name='post[123][comment][123][title]' type='text' value='Hello World' />"
     end
 
     assert_dom_equal expected, output_buffer
@@ -1019,9 +1019,9 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      "<input name='post[123][comment][5][title]' type='text' id='post_123_comment_5_title' value='Hello World' />"
+      "<input name='post[123][comment][5][title]' type='text' value='Hello World' />"
     end + whole_form("/posts/123", method: "patch") do
-      "<input name='post[1][comment][123][title]' type='text' id='post_1_comment_123_title' value='Hello World' />"
+      "<input name='post[1][comment][123][title]' type='text' value='Hello World' />"
     end
 
     assert_dom_equal expected, output_buffer
@@ -1038,8 +1038,8 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      '<input name="post[title]" type="text" id="post_title" value="Hello World" />' +
-        '<input id="post_author_attributes_name" name="post[author_attributes][name]" type="text" value="new author" />'
+      '<input name="post[title]" type="text" value="Hello World" />' +
+        '<input name="post[author_attributes][name]" type="text" value="new author" />'
     end
 
     assert_dom_equal expected, output_buffer
@@ -1065,9 +1065,9 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      '<input name="post[title]" type="text" id="post_title" value="Hello World" />' +
-      '<input id="post_author_attributes_name" name="post[author_attributes][name]" type="text" value="author #321" />' +
-      '<input id="post_author_attributes_id" name="post[author_attributes][id]" type="hidden" value="321" />'
+      '<input name="post[title]" type="text" value="Hello World" />' +
+      '<input name="post[author_attributes][name]" type="text" value="author #321" />' +
+      '<input name="post[author_attributes][id]" type="hidden" value="321" />'
     end
 
     assert_dom_equal expected, output_buffer
@@ -1084,9 +1084,9 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      '<input name="post[title]" type="text" id="post_title" value="Hello World" />' +
-      '<input id="post_author_attributes_name" name="post[author_attributes][name]" type="text" value="author #321" />' +
-      '<input id="post_author_attributes_id" name="post[author_attributes][id]" type="hidden" value="321" />'
+      '<input name="post[title]" type="text" value="Hello World" />' +
+      '<input name="post[author_attributes][name]" type="text" value="author #321" />' +
+      '<input name="post[author_attributes][id]" type="hidden" value="321" />'
     end
 
     assert_dom_equal expected, output_buffer
@@ -1103,8 +1103,8 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      '<input name="post[title]" type="text" id="post_title" value="Hello World" />' +
-      '<input id="post_author_attributes_name" name="post[author_attributes][name]" type="text" value="author #321" />'
+      '<input name="post[title]" type="text" value="Hello World" />' +
+      '<input name="post[author_attributes][name]" type="text" value="author #321" />'
     end
 
     assert_dom_equal expected, output_buffer
@@ -1121,8 +1121,8 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      '<input name="post[title]" type="text" id="post_title" value="Hello World" />' +
-      '<input id="post_author_attributes_name" name="post[author_attributes][name]" type="text" value="author #321" />'
+      '<input name="post[title]" type="text" value="Hello World" />' +
+      '<input name="post[author_attributes][name]" type="text" value="author #321" />'
     end
 
     assert_dom_equal expected, output_buffer
@@ -1139,9 +1139,9 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      '<input name="post[title]" type="text" id="post_title" value="Hello World" />' +
-      '<input id="post_author_attributes_name" name="post[author_attributes][name]" type="text" value="author #321" />' +
-      '<input id="post_author_attributes_id" name="post[author_attributes][id]" type="hidden" value="321" />'
+      '<input name="post[title]" type="text" value="Hello World" />' +
+      '<input name="post[author_attributes][name]" type="text" value="author #321" />' +
+      '<input name="post[author_attributes][id]" type="hidden" value="321" />'
     end
 
     assert_dom_equal expected, output_buffer
@@ -1159,9 +1159,9 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      '<input name="post[title]" type="text" id="post_title" value="Hello World" />' +
-      '<input id="post_author_attributes_id" name="post[author_attributes][id]" type="hidden" value="321" />' +
-      '<input id="post_author_attributes_name" name="post[author_attributes][name]" type="text" value="author #321" />'
+      '<input name="post[title]" type="text" value="Hello World" />' +
+      '<input name="post[author_attributes][id]" type="hidden" value="321" />' +
+      '<input name="post[author_attributes][name]" type="text" value="author #321" />'
     end
 
     assert_dom_equal expected, output_buffer
@@ -1180,11 +1180,11 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      '<input name="post[title]" type="text" id="post_title" value="Hello World" />' +
-      '<input id="post_comments_attributes_0_name" name="post[comments_attributes][0][name]" type="text" value="comment #1" />' +
-      '<input id="post_comments_attributes_0_id" name="post[comments_attributes][0][id]" type="hidden" value="1" />' +
-      '<input id="post_comments_attributes_1_name" name="post[comments_attributes][1][name]" type="text" value="comment #2" />' +
-      '<input id="post_comments_attributes_1_id" name="post[comments_attributes][1][id]" type="hidden" value="2" />'
+      '<input name="post[title]" type="text" value="Hello World" />' +
+      '<input name="post[comments_attributes][0][name]" type="text" value="comment #1" />' +
+      '<input name="post[comments_attributes][0][id]" type="hidden" value="1" />' +
+      '<input name="post[comments_attributes][1][name]" type="text" value="comment #2" />' +
+      '<input name="post[comments_attributes][1][id]" type="hidden" value="2" />'
     end
 
     assert_dom_equal expected, output_buffer
@@ -1207,11 +1207,11 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      '<input name="post[title]" type="text" id="post_title" value="Hello World" />' +
-      '<input id="post_author_attributes_name" name="post[author_attributes][name]" type="text" value="author #321" />' +
-      '<input id="post_author_attributes_id" name="post[author_attributes][id]" type="hidden" value="321" />' +
-      '<input id="post_comments_attributes_0_name" name="post[comments_attributes][0][name]" type="text" value="comment #1" />' +
-      '<input id="post_comments_attributes_1_name" name="post[comments_attributes][1][name]" type="text" value="comment #2" />'
+      '<input name="post[title]" type="text" value="Hello World" />' +
+      '<input name="post[author_attributes][name]" type="text" value="author #321" />' +
+      '<input name="post[author_attributes][id]" type="hidden" value="321" />' +
+      '<input name="post[comments_attributes][0][name]" type="text" value="comment #1" />' +
+      '<input name="post[comments_attributes][1][name]" type="text" value="comment #2" />'
     end
 
     assert_dom_equal expected, output_buffer
@@ -1234,10 +1234,10 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      '<input name="post[title]" type="text" id="post_title" value="Hello World" />' +
-      '<input id="post_author_attributes_name" name="post[author_attributes][name]" type="text" value="author #321" />' +
-      '<input id="post_comments_attributes_0_name" name="post[comments_attributes][0][name]" type="text" value="comment #1" />' +
-      '<input id="post_comments_attributes_1_name" name="post[comments_attributes][1][name]" type="text" value="comment #2" />'
+      '<input name="post[title]" type="text" value="Hello World" />' +
+      '<input name="post[author_attributes][name]" type="text" value="author #321" />' +
+      '<input name="post[comments_attributes][0][name]" type="text" value="comment #1" />' +
+      '<input name="post[comments_attributes][1][name]" type="text" value="comment #2" />'
     end
 
     assert_dom_equal expected, output_buffer
@@ -1260,11 +1260,11 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      '<input name="post[title]" type="text" id="post_title" value="Hello World" />' +
-      '<input id="post_author_attributes_name" name="post[author_attributes][name]" type="text" value="author #321" />' +
-      '<input id="post_author_attributes_id" name="post[author_attributes][id]" type="hidden" value="321" />' +
-      '<input id="post_comments_attributes_0_name" name="post[comments_attributes][0][name]" type="text" value="comment #1" />' +
-      '<input id="post_comments_attributes_1_name" name="post[comments_attributes][1][name]" type="text" value="comment #2" />'
+      '<input name="post[title]" type="text" value="Hello World" />' +
+      '<input name="post[author_attributes][name]" type="text" value="author #321" />' +
+      '<input name="post[author_attributes][id]" type="hidden" value="321" />' +
+      '<input name="post[comments_attributes][0][name]" type="text" value="comment #1" />' +
+      '<input name="post[comments_attributes][1][name]" type="text" value="comment #2" />'
     end
 
     assert_dom_equal expected, output_buffer
@@ -1283,11 +1283,11 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      '<input name="post[title]" type="text" id="post_title" value="Hello World" />' +
-      '<input id="post_comments_attributes_0_name" name="post[comments_attributes][0][name]" type="text" value="comment #1" />' +
-      '<input id="post_comments_attributes_0_id" name="post[comments_attributes][0][id]" type="hidden" value="1" />' +
-      '<input id="post_comments_attributes_1_name" name="post[comments_attributes][1][name]" type="text" value="comment #2" />' +
-      '<input id="post_comments_attributes_1_id" name="post[comments_attributes][1][id]" type="hidden" value="2" />'
+      '<input name="post[title]" type="text" value="Hello World" />' +
+      '<input name="post[comments_attributes][0][name]" type="text" value="comment #1" />' +
+      '<input name="post[comments_attributes][0][id]" type="hidden" value="1" />' +
+      '<input name="post[comments_attributes][1][name]" type="text" value="comment #2" />' +
+      '<input name="post[comments_attributes][1][id]" type="hidden" value="2" />'
     end
 
     assert_dom_equal expected, output_buffer
@@ -1307,11 +1307,11 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      '<input name="post[title]" type="text" id="post_title" value="Hello World" />' +
-      '<input id="post_comments_attributes_0_id" name="post[comments_attributes][0][id]" type="hidden" value="1" />' +
-      '<input id="post_comments_attributes_0_name" name="post[comments_attributes][0][name]" type="text" value="comment #1" />' +
-      '<input id="post_comments_attributes_1_id" name="post[comments_attributes][1][id]" type="hidden" value="2" />' +
-      '<input id="post_comments_attributes_1_name" name="post[comments_attributes][1][name]" type="text" value="comment #2" />'
+      '<input name="post[title]" type="text" value="Hello World" />' +
+      '<input name="post[comments_attributes][0][id]" type="hidden" value="1" />' +
+      '<input name="post[comments_attributes][0][name]" type="text" value="comment #1" />' +
+      '<input name="post[comments_attributes][1][id]" type="hidden" value="2" />' +
+      '<input name="post[comments_attributes][1][name]" type="text" value="comment #2" />'
     end
 
     assert_dom_equal expected, output_buffer
@@ -1330,9 +1330,9 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      '<input name="post[title]" type="text" id="post_title" value="Hello World" />' +
-      '<input id="post_comments_attributes_0_name" name="post[comments_attributes][0][name]" type="text" value="new comment" />' +
-      '<input id="post_comments_attributes_1_name" name="post[comments_attributes][1][name]" type="text" value="new comment" />'
+      '<input name="post[title]" type="text" value="Hello World" />' +
+      '<input name="post[comments_attributes][0][name]" type="text" value="new comment" />' +
+      '<input name="post[comments_attributes][1][name]" type="text" value="new comment" />'
     end
 
     assert_dom_equal expected, output_buffer
@@ -1351,10 +1351,10 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      '<input name="post[title]" type="text" id="post_title" value="Hello World" />' +
-      '<input id="post_comments_attributes_0_name" name="post[comments_attributes][0][name]" type="text" value="comment #321" />' +
-      '<input id="post_comments_attributes_0_id" name="post[comments_attributes][0][id]" type="hidden" value="321" />' +
-      '<input id="post_comments_attributes_1_name" name="post[comments_attributes][1][name]" type="text" value="new comment" />'
+      '<input name="post[title]" type="text" value="Hello World" />' +
+      '<input name="post[comments_attributes][0][name]" type="text" value="comment #321" />' +
+      '<input name="post[comments_attributes][0][id]" type="hidden" value="321" />' +
+      '<input name="post[comments_attributes][1][name]" type="text" value="new comment" />'
     end
 
     assert_dom_equal expected, output_buffer
@@ -1369,7 +1369,7 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      '<input name="post[title]" type="text" id="post_title" value="Hello World" />'
+      '<input name="post[title]" type="text" value="Hello World" />'
     end
 
     assert_dom_equal expected, output_buffer
@@ -1386,11 +1386,11 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      '<input name="post[title]" type="text" id="post_title" value="Hello World" />' +
-      '<input id="post_comments_attributes_0_name" name="post[comments_attributes][0][name]" type="text" value="comment #1" />' +
-      '<input id="post_comments_attributes_0_id" name="post[comments_attributes][0][id]" type="hidden" value="1" />' +
-      '<input id="post_comments_attributes_1_name" name="post[comments_attributes][1][name]" type="text" value="comment #2" />' +
-      '<input id="post_comments_attributes_1_id" name="post[comments_attributes][1][id]" type="hidden" value="2" />'
+      '<input name="post[title]" type="text" value="Hello World" />' +
+      '<input name="post[comments_attributes][0][name]" type="text" value="comment #1" />' +
+      '<input name="post[comments_attributes][0][id]" type="hidden" value="1" />' +
+      '<input name="post[comments_attributes][1][name]" type="text" value="comment #2" />' +
+      '<input name="post[comments_attributes][1][id]" type="hidden" value="2" />'
     end
 
     assert_dom_equal expected, output_buffer
@@ -1407,11 +1407,11 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      '<input name="post[title]" type="text" id="post_title" value="Hello World" />' +
-      '<input id="post_comments_attributes_0_name" name="post[comments_attributes][0][name]" type="text" value="comment #1" />' +
-      '<input id="post_comments_attributes_0_id" name="post[comments_attributes][0][id]" type="hidden" value="1" />' +
-      '<input id="post_comments_attributes_1_name" name="post[comments_attributes][1][name]" type="text" value="comment #2" />' +
-      '<input id="post_comments_attributes_1_id" name="post[comments_attributes][1][id]" type="hidden" value="2" />'
+      '<input name="post[title]" type="text" value="Hello World" />' +
+      '<input name="post[comments_attributes][0][name]" type="text" value="comment #1" />' +
+      '<input name="post[comments_attributes][0][id]" type="hidden" value="1" />' +
+      '<input name="post[comments_attributes][1][name]" type="text" value="comment #2" />' +
+      '<input name="post[comments_attributes][1][id]" type="hidden" value="2" />'
     end
 
     assert_dom_equal expected, output_buffer
@@ -1442,11 +1442,11 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      '<input name="post[title]" type="text" id="post_title" value="Hello World" />' +
-      '<input id="post_comments_attributes_0_name" name="post[comments_attributes][0][name]" type="text" value="comment #1" />' +
-      '<input id="post_comments_attributes_0_id" name="post[comments_attributes][0][id]" type="hidden" value="1" />' +
-      '<input id="post_comments_attributes_1_name" name="post[comments_attributes][1][name]" type="text" value="comment #2" />' +
-      '<input id="post_comments_attributes_1_id" name="post[comments_attributes][1][id]" type="hidden" value="2" />'
+      '<input name="post[title]" type="text" value="Hello World" />' +
+      '<input name="post[comments_attributes][0][name]" type="text" value="comment #1" />' +
+      '<input name="post[comments_attributes][0][id]" type="hidden" value="1" />' +
+      '<input name="post[comments_attributes][1][name]" type="text" value="comment #2" />' +
+      '<input name="post[comments_attributes][1][id]" type="hidden" value="2" />'
     end
 
     assert_dom_equal expected, output_buffer
@@ -1465,10 +1465,10 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      '<input name="post[title]" type="text" id="post_title" value="Hello World" />' +
-      '<input id="post_comments_attributes_0_name" name="post[comments_attributes][0][name]" type="text" value="comment #321" />' +
-      '<input id="post_comments_attributes_0_id" name="post[comments_attributes][0][id]" type="hidden" value="321" />' +
-      '<input id="post_comments_attributes_1_name" name="post[comments_attributes][1][name]" type="text" value="new comment" />'
+      '<input name="post[title]" type="text" value="Hello World" />' +
+      '<input name="post[comments_attributes][0][name]" type="text" value="comment #321" />' +
+      '<input name="post[comments_attributes][0][id]" type="hidden" value="321" />' +
+      '<input name="post[comments_attributes][1][name]" type="text" value="new comment" />'
     end
 
     assert_dom_equal expected, output_buffer
@@ -1485,8 +1485,8 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      '<input id="post_comments_attributes_abc_name" name="post[comments_attributes][abc][name]" type="text" value="comment #321" />' +
-      '<input id="post_comments_attributes_abc_id" name="post[comments_attributes][abc][id]" type="hidden" value="321" />'
+      '<input name="post[comments_attributes][abc][name]" type="text" value="comment #321" />' +
+      '<input name="post[comments_attributes][abc][id]" type="hidden" value="321" />'
     end
 
     assert_dom_equal expected, output_buffer
@@ -1502,8 +1502,8 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      '<input id="post_comments_attributes_abc_name" name="post[comments_attributes][abc][name]" type="text" value="comment #321" />' +
-      '<input id="post_comments_attributes_abc_id" name="post[comments_attributes][abc][id]" type="hidden" value="321" />'
+      '<input name="post[comments_attributes][abc][name]" type="text" value="comment #321" />' +
+      '<input name="post[comments_attributes][abc][id]" type="hidden" value="321" />'
     end
 
     assert_dom_equal expected, output_buffer
@@ -1525,8 +1525,8 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      '<input id="post_comments_attributes_abc_name" name="post[comments_attributes][abc][name]" type="text" value="comment #321" />' +
-      '<input id="post_comments_attributes_abc_id" name="post[comments_attributes][abc][id]" type="hidden" value="321" />'
+      '<input name="post[comments_attributes][abc][name]" type="text" value="comment #321" />' +
+      '<input name="post[comments_attributes][abc][id]" type="hidden" value="321" />'
     end
 
     assert_dom_equal expected, output_buffer
@@ -1611,18 +1611,18 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      '<input id="post_comments_attributes_0_name" name="post[comments_attributes][0][name]" type="text" value="comment #321" />' +
-      '<input id="post_comments_attributes_0_relevances_attributes_0_value" name="post[comments_attributes][0][relevances_attributes][0][value]" type="text" value="commentrelevance #314" />' +
-      '<input id="post_comments_attributes_0_relevances_attributes_0_id" name="post[comments_attributes][0][relevances_attributes][0][id]" type="hidden" value="314" />' +
-      '<input id="post_comments_attributes_0_id" name="post[comments_attributes][0][id]" type="hidden" value="321" />' +
-      '<input id="post_tags_attributes_0_value" name="post[tags_attributes][0][value]" type="text" value="tag #123" />' +
-      '<input id="post_tags_attributes_0_relevances_attributes_0_value" name="post[tags_attributes][0][relevances_attributes][0][value]" type="text" value="tagrelevance #3141" />' +
-      '<input id="post_tags_attributes_0_relevances_attributes_0_id" name="post[tags_attributes][0][relevances_attributes][0][id]" type="hidden" value="3141" />' +
-      '<input id="post_tags_attributes_0_id" name="post[tags_attributes][0][id]" type="hidden" value="123" />' +
-      '<input id="post_tags_attributes_1_value" name="post[tags_attributes][1][value]" type="text" value="tag #456" />' +
-      '<input id="post_tags_attributes_1_relevances_attributes_0_value" name="post[tags_attributes][1][relevances_attributes][0][value]" type="text" value="tagrelevance #31415" />' +
-      '<input id="post_tags_attributes_1_relevances_attributes_0_id" name="post[tags_attributes][1][relevances_attributes][0][id]" type="hidden" value="31415" />' +
-      '<input id="post_tags_attributes_1_id" name="post[tags_attributes][1][id]" type="hidden" value="456" />'
+      '<input name="post[comments_attributes][0][name]" type="text" value="comment #321" />' +
+      '<input name="post[comments_attributes][0][relevances_attributes][0][value]" type="text" value="commentrelevance #314" />' +
+      '<input name="post[comments_attributes][0][relevances_attributes][0][id]" type="hidden" value="314" />' +
+      '<input name="post[comments_attributes][0][id]" type="hidden" value="321" />' +
+      '<input name="post[tags_attributes][0][value]" type="text" value="tag #123" />' +
+      '<input name="post[tags_attributes][0][relevances_attributes][0][value]" type="text" value="tagrelevance #3141" />' +
+      '<input name="post[tags_attributes][0][relevances_attributes][0][id]" type="hidden" value="3141" />' +
+      '<input name="post[tags_attributes][0][id]" type="hidden" value="123" />' +
+      '<input name="post[tags_attributes][1][value]" type="text" value="tag #456" />' +
+      '<input name="post[tags_attributes][1][relevances_attributes][0][value]" type="text" value="tagrelevance #31415" />' +
+      '<input name="post[tags_attributes][1][relevances_attributes][0][id]" type="hidden" value="31415" />' +
+      '<input name="post[tags_attributes][1][id]" type="hidden" value="456" />'
     end
 
     assert_dom_equal expected, output_buffer
@@ -1638,7 +1638,7 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      '<input id="post_author_attributes_name" name="post[author_attributes][name]" type="text" value="hash backed author" />'
+      '<input name="post[author_attributes][name]" type="text" value="hash backed author" />'
     end
 
     assert_dom_equal expected, output_buffer
@@ -1652,10 +1652,10 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected =
-      "<input name='post[title]' type='text' id='post_title' value='Hello World' />" +
-      "<textarea name='post[body]' id='post_body'>\nBack to the hill and over it again!</textarea>" +
+      "<input name='post[title]' type='text' value='Hello World' />" +
+      "<textarea name='post[body]'>\nBack to the hill and over it again!</textarea>" +
       "<input name='post[secret]' type='hidden' value='0' />" +
-      "<input name='post[secret]' checked='checked' type='checkbox' id='post_secret' value='1' />"
+      "<input name='post[secret]' checked='checked' type='checkbox' value='1' />"
 
     assert_dom_equal expected, output_buffer
   end
@@ -1668,10 +1668,10 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected =
-      "<input name='post[123][title]' type='text' id='post_123_title' value='Hello World' />" +
-      "<textarea name='post[123][body]' id='post_123_body'>\nBack to the hill and over it again!</textarea>" +
+      "<input name='post[123][title]' type='text' value='Hello World' />" +
+      "<textarea name='post[123][body]'>\nBack to the hill and over it again!</textarea>" +
       "<input name='post[123][secret]' type='hidden' value='0' />" +
-      "<input name='post[123][secret]' checked='checked' type='checkbox' id='post_123_secret' value='1' />"
+      "<input name='post[123][secret]' checked='checked' type='checkbox' value='1' />"
 
     assert_dom_equal expected, output_buffer
   end
@@ -1684,10 +1684,10 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected =
-      "<input name='post[][title]' type='text' id='post__title' value='Hello World' />" +
-      "<textarea name='post[][body]' id='post__body'>\nBack to the hill and over it again!</textarea>" +
+      "<input name='post[][title]' type='text' value='Hello World' />" +
+      "<textarea name='post[][body]'>\nBack to the hill and over it again!</textarea>" +
       "<input name='post[][secret]' type='hidden' value='0' />" +
-      "<input name='post[][secret]' checked='checked' type='checkbox' id='post__secret' value='1' />"
+      "<input name='post[][secret]' checked='checked' type='checkbox' value='1' />"
 
     assert_dom_equal expected, output_buffer
   end
@@ -1700,10 +1700,10 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected =
-      "<input name='post[abc][title]' type='text' id='post_abc_title' value='Hello World' />" +
-      "<textarea name='post[abc][body]' id='post_abc_body'>\nBack to the hill and over it again!</textarea>" +
+      "<input name='post[abc][title]' type='text' value='Hello World' />" +
+      "<textarea name='post[abc][body]'>\nBack to the hill and over it again!</textarea>" +
       "<input name='post[abc][secret]' type='hidden' value='0' />" +
-      "<input name='post[abc][secret]' checked='checked' type='checkbox' id='post_abc_secret' value='1' />"
+      "<input name='post[abc][secret]' checked='checked' type='checkbox' value='1' />"
 
     assert_dom_equal expected, output_buffer
   end
@@ -1716,10 +1716,10 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected =
-      "<input name='post[title]' type='text' id='post_title' value='Hello World' />" +
-      "<textarea name='post[body]' id='post_body'>\nBack to the hill and over it again!</textarea>" +
+      "<input name='post[title]' type='text' value='Hello World' />" +
+      "<textarea name='post[body]'>\nBack to the hill and over it again!</textarea>" +
       "<input name='post[secret]' type='hidden' value='0' />" +
-      "<input name='post[secret]' checked='checked' type='checkbox' id='post_secret' value='1' />"
+      "<input name='post[secret]' checked='checked' type='checkbox' value='1' />"
 
     assert_dom_equal expected, output_buffer
   end
@@ -1732,10 +1732,10 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected =
-      "<input name='post[title]' type='text' id='post_title' value='Hello World' />" +
-      "<textarea name='post[body]' id='post_body'>\nBack to the hill and over it again!</textarea>" +
+      "<input name='post[title]' type='text' value='Hello World' />" +
+      "<textarea name='post[body]'>\nBack to the hill and over it again!</textarea>" +
       "<input name='post[secret]' type='hidden' value='0' />" +
-      "<input name='post[secret]' checked='checked' type='checkbox' id='post_secret' value='1' />"
+      "<input name='post[secret]' checked='checked' type='checkbox' value='1' />"
 
     assert_dom_equal expected, output_buffer
   end
@@ -1747,7 +1747,7 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     assert_dom_equal "<label for=\"author_post_title\">Title</label>" +
-    "<input name='author[post][title]' type='text' id='author_post_title' value='Hello World' />",
+    "<input name='author[post][title]' type='text' value='Hello World' />",
       output_buffer
   end
 
@@ -1758,7 +1758,7 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     assert_dom_equal "<label for=\"author_post_1_title\">Title</label>" +
-      "<input name='author[post][1][title]' type='text' id='author_post_1_title' value='Hello World' />",
+      "<input name='author[post][1][title]' type='text' value='Hello World' />",
       output_buffer
   end
 
@@ -1777,10 +1777,10 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", "create-post", method: "patch") do
-      "<input name='post[title]' type='text' id='post_title' value='Hello World' />" +
-      "<textarea name='post[body]' id='post_body'>\nBack to the hill and over it again!</textarea>" +
+      "<input name='post[title]' type='text' value='Hello World' />" +
+      "<textarea name='post[body]'>\nBack to the hill and over it again!</textarea>" +
       "<input name='parent_post[secret]' type='hidden' value='0' />" +
-      "<input name='parent_post[secret]' checked='checked' type='checkbox' id='parent_post_secret' value='1' />"
+      "<input name='parent_post[secret]' checked='checked' type='checkbox' value='1' />"
     end
 
     assert_dom_equal expected, output_buffer
@@ -1797,9 +1797,9 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", "create-post", method: "patch") do
-      "<input name='post[title]' type='text' id='post_title' value='Hello World' />" +
-      "<textarea name='post[body]' id='post_body'>\nBack to the hill and over it again!</textarea>" +
-      "<input name='post[comment][name]' type='text' id='post_comment_name' value='new comment' />"
+      "<input name='post[title]' type='text' value='Hello World' />" +
+      "<textarea name='post[body]'>\nBack to the hill and over it again!</textarea>" +
+      "<input name='post[comment][name]' type='text' value='new comment' />"
     end
 
     assert_dom_equal expected, output_buffer
@@ -1813,7 +1813,7 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      "<input name='post[category][name]' type='text' id='post_category_name' />"
+      "<input name='post[category][name]' type='text' />"
     end
 
     assert_dom_equal expected, output_buffer
@@ -1837,9 +1837,9 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      "<label for='title'>Title:</label> <input name='post[title]' type='text' id='post_title' value='Hello World' /><br/>" +
-      "<label for='body'>Body:</label> <textarea name='post[body]' id='post_body'>\nBack to the hill and over it again!</textarea><br/>" +
-      "<label for='secret'>Secret:</label> <input name='post[secret]' type='hidden' value='0' /><input name='post[secret]' checked='checked' type='checkbox' id='post_secret' value='1' /><br/>"
+      "<label for='title'>Title:</label> <input name='post[title]' type='text' value='Hello World' /><br/>" +
+      "<label for='body'>Body:</label> <textarea name='post[body]'>\nBack to the hill and over it again!</textarea><br/>" +
+      "<label for='secret'>Secret:</label> <input name='post[secret]' type='hidden' value='0' /><input name='post[secret]' checked='checked' type='checkbox' value='1' /><br/>"
     end
 
     assert_dom_equal expected, output_buffer
@@ -1856,9 +1856,9 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      "<label for='title'>Title:</label> <input name='post[title]' type='text' id='post_title' value='Hello World' /><br/>" +
-      "<label for='body'>Body:</label> <textarea name='post[body]' id='post_body'>\nBack to the hill and over it again!</textarea><br/>" +
-      "<label for='secret'>Secret:</label> <input name='post[secret]' type='hidden' value='0' /><input name='post[secret]' checked='checked' type='checkbox' id='post_secret' value='1' /><br/>"
+      "<label for='title'>Title:</label> <input name='post[title]' type='text' value='Hello World' /><br/>" +
+      "<label for='body'>Body:</label> <textarea name='post[body]'>\nBack to the hill and over it again!</textarea><br/>" +
+      "<label for='secret'>Secret:</label> <input name='post[secret]' type='hidden' value='0' /><input name='post[secret]' checked='checked' type='checkbox' value='1' /><br/>"
     end
 
     assert_dom_equal expected, output_buffer
@@ -1875,7 +1875,7 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected = whole_form("/posts/123", method: "patch") do
-      "<label for='title'>Title:</label> <input name='post[title]' type='text' id='post_title' value='Hello World' /><br/>"
+      "<label for='title'>Title:</label> <input name='post[title]' type='text' value='Hello World' /><br/>"
     end
 
     assert_dom_equal expected, output_buffer
@@ -1890,7 +1890,7 @@ class FormWithActsLikeFormForTest < FormWithTest
       concat f.text_field(:title)
     end
 
-    expected = "<label for='title'>Title:</label> <input name='post[title]' type='text' id='post_title' value='Hello World' /><br/>"
+    expected = "<label for='title'>Title:</label> <input name='post[title]' type='text' value='Hello World' /><br/>"
 
     assert_dom_equal expected, output_buffer
   end
@@ -1902,7 +1902,7 @@ class FormWithActsLikeFormForTest < FormWithTest
       concat f.text_field(:title)
     end
 
-    expected = "<label for='title'>Title:</label> <input name='post[title]' type='text' id='post_title' value='Hello World' /><br/>"
+    expected = "<label for='title'>Title:</label> <input name='post[title]' type='text' value='Hello World' /><br/>"
 
     assert_dom_equal expected, output_buffer
   end
@@ -1915,9 +1915,9 @@ class FormWithActsLikeFormForTest < FormWithTest
     end
 
     expected =
-      "<label for='title'>Title:</label> <input name='post[title]' type='text' id='post_title' value='Hello World' /><br/>" +
-      "<label for='body'>Body:</label> <textarea name='post[body]' id='post_body'>\nBack to the hill and over it again!</textarea><br/>" +
-      "<label for='secret'>Secret:</label> <input name='post[secret]' type='hidden' value='0' /><input name='post[secret]' checked='checked' type='checkbox' id='post_secret' value='1' /><br/>"
+      "<label for='title'>Title:</label> <input name='post[title]' type='text' value='Hello World' /><br/>" +
+      "<label for='body'>Body:</label> <textarea name='post[body]'>\nBack to the hill and over it again!</textarea><br/>" +
+      "<label for='secret'>Secret:</label> <input name='post[secret]' type='hidden' value='0' /><input name='post[secret]' checked='checked' type='checkbox' value='1' /><br/>"
 
     assert_dom_equal expected, output_buffer
   end