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ActionView::Helpers::FormHelper#fields_for API changed in master
Reported by Justin French | April 20th, 2011 @ 01:23 PM
ActionView::Helpers::FormHelper#fields_for now has four params (record, record_object, options, block) in master instead of three (record_or_name_or_array, args, &block) in Rails 3.0.6.
I'm mostly surprised that a public method has changed between releases without deprecation warnings, documentation, etc. It also bugs me that the params are different to ActionView::Helpers::FormBuilder#fields_for. The change seems to have been introduced in 58d3b9042302d41f90fc129f12787d83f7bdade9 ("Speed up form_for by specializing extract_options!") by Yehuda in August (can be found in the diff between v3.0.6 and master).
Ideally this change would be reverted, or perhaps a backwards compatible way to keep the optimisation can be found.
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Justin French