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-rw-r--r--actionview/lib/action_view/helpers/form_helper.rb9
1 files changed, 8 insertions, 1 deletions
diff --git a/actionview/lib/action_view/helpers/form_helper.rb b/actionview/lib/action_view/helpers/form_helper.rb
index 5a9a5d6d18..610f5c0b4a 100644
--- a/actionview/lib/action_view/helpers/form_helper.rb
+++ b/actionview/lib/action_view/helpers/form_helper.rb
@@ -1617,7 +1617,14 @@ module ActionView
@auto_index
end
- record_name = index ? "#{object_name}[#{index}][#{record_name}]" : "#{object_name}[#{record_name}]"
+ record_name = if index
+ "#{object_name}[#{index}][#{record_name}]"
+ elsif record_name.to_s.end_with?('[]')
+ record_name = record_name.to_s.sub(/(.*)\[\]$/, "[\\1][#{record_object.id}]")
+ "#{object_name}#{record_name}"
+ else
+ "#{object_name}[#{record_name}]"
+ end
fields_options[:child_index] = index
@template.fields_for(record_name, record_object, fields_options, &block)