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expilo on #196 Nested Model Form Part 1 2013-09-05 11:12:11

Rails 4 docs give slightly different syntax:

accepts_nested_attributes_for :avatar, reject_if: proc { |attributes| attributes['name'].blank? }
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expilo on #253 CarrierWave File Uploads 2013-08-23 22:21:10

Sadly, I am getting ActiveModel::ForbiddenAttributesError when I try to use this recipe in Rails 4. Any idea how to update it for Rails 4?