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I want to write a custom validation in Rails 3, but following this example I get:
'ActiveModel::DeprecatedErrorMethods.add_to_base' call is deprecated in Rails 3.0
What is the rails3 version of:
def validate
errors.add_to_base "If you are attaching a file you must enter a label for it" if !attachment.blank? and attachment_label.blank?
end
This should work in rails 3.1.3: