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-rw-r--r--actionpack/lib/action_view/helpers/form_helper.rb5
1 files changed, 5 insertions, 0 deletions
diff --git a/actionpack/lib/action_view/helpers/form_helper.rb b/actionpack/lib/action_view/helpers/form_helper.rb
index 6abf1e1751..c79d30ea88 100644
--- a/actionpack/lib/action_view/helpers/form_helper.rb
+++ b/actionpack/lib/action_view/helpers/form_helper.rb
@@ -702,6 +702,11 @@ module ActionView
# <% end %>
# ...
# <% end %>
+ #
+ # Note that fields_for will automatically generate a hidden field
+ # to store the ID of the record. There are circumstances where this
+ # hidden field is not needed and you can pass <tt>hidden_field_id: false</tt>
+ # to prevent fields_for from rendering it automatically.
def fields_for(record_name, record_object = nil, options = {}, &block)
builder = instantiate_builder(record_name, record_object, options)
output = capture(builder, &block)