Posted over 10 years ago. Visible to the public. Repeats.
Copying validation errors from one attribute to another
When using virtual attributes, the attached trait can be useful to automatically copy errors from one attribute to another.
Here is a typical use case where Paperclip creates a virtual attribute :attachment, but there are validations on both :attachment and :attachment_file_name. If the form has a file picker on :attachment, you would like to highlight it with errors from any attribute:
Copyclass Note < ActiveRecord::Base has_attached_file :attachment validates_attachment_presence :attachment validates_format_of :attachment_file_name, :with => /^\d+\.jpg$/ include DoesCopyErrors[from: :attachment_file_name, to: :attachment] end
If you'd like to remove the errors from the source attribute once they are copied to the target attribute, you can use the :move option:
Copyinclude DoesCopyErors[from: :attachment_file_name, to: :attachment, move: true]
By refactoring problematic code and creating automated tests, makandra can vastly improve the maintainability of your Rails application.
