Handle nested fields_for by adding indexes to record_name

In case of the form with nested fields_for, i. e.

<%= form_for :foos, url: root_path do |f| %>
    <% @foos.each do |foo| %>
        <%= f.fields_for 'foo[]', foo do |f2| %>
            <%= f2.text_field :id %>
            <% foo.bars.each do |bar| %>
                <%= f2.fields_for 'bar[]', bar do |b| %>
                    <%= b.text_field :id %>
                <% end %>
            <% end %>
        <% end %>
     <% end %>
    <%= f.submit %>
<% end %>

rails doesn't add index for 'foo' in the inner fields_for block, so field names
in the outer fields_for looks like "foos[foo][#{foo_index}][id]" and in the
inner "foos[foo[]][bar][#{bar_index}][id]". Submitting of such form leads to an
error like:
>ActionController::BadRequest (Invalid request parameters: expected Array
>(got Rack::QueryParser::Params) for param `foo'):

This commit adds indexes for the foos in the inner blocks, so field names
become "foos[foo][#{foo_index}][bar][#{bar_index}][id]" and submitting of such
form works fine as expected.

Fixes #15332

1 files changed, 21 insertions, 0 deletions

diff --git a/actionview/test/template/form_helper_test.rb b/actionview/test/template/form_helper_test.rb
index aef137935a..659338e22b 100644
--- a/actionview/test/template/form_helper_test.rb
+++ b/actionview/test/template/form_helper_test.rb
@@ -2292,6 +2292,27 @@ class FormHelperTest < ActionView::TestCase
     assert_dom_equal expected, output_buffer
   end
 
+  def test_deep_nested_fields_for
+    @comment.save
+    form_for(:posts) do |f|
+      f.fields_for('post[]', @post) do |f2|
+        f2.text_field(:id)
+        @post.comments.each do |comment|
+          concat f2.fields_for('comment[]', comment) { |c|
+            concat c.text_field(:name)
+          }
+        end
+      end
+    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' />"
+    end
+
+    assert_dom_equal expected, output_buffer
+  end
+
+
   def test_nested_fields_for_with_nested_collections
     form_for(@post, as: 'post[]') do |f|
       concat f.text_field(:title)