Revert "Remove deprecated form_for with strings or symbols"

This code was not deprecated. What was deprecated is the following:

  form_for(:foo, @foo)

Which now should be rewritten as:

  form_for(@foo, :as => :foo)

The following format is valid:

  form_for(:foo)

This reverts commit be797750e6ce866ea08307f63bf35304a965c8d4.

1 files changed, 9 insertions, 3 deletions

diff --git a/actionpack/lib/action_view/helpers/form_helper.rb b/actionpack/lib/action_view/helpers/form_helper.rb
index dec1ae6e4f..8c300ec745 100644
--- a/actionpack/lib/action_view/helpers/form_helper.rb
+++ b/actionpack/lib/action_view/helpers/form_helper.rb
@@ -303,9 +303,15 @@ module ActionView
 
         options[:html] ||= {}
 
-        object      = record.is_a?(Array) ? record.last : record
-        object_name = options[:as] || ActiveModel::Naming.param_key(object)
-        apply_form_for_options!(record, options)
+        case record
+        when String, Symbol
+          object_name = record
+          object      = nil
+        else
+          object      = record.is_a?(Array) ? record.last : record
+          object_name = options[:as] || ActiveModel::Naming.param_key(object)
+          apply_form_for_options!(record, options)
+        end
 
         options[:html][:remote] = options.delete(:remote)
         builder = options[:parent_builder] = instantiate_builder(object_name, object, options, &proc)