Attachment Fu Validates As Attachment Hack
November 28th, 2007 by pyrat
Recent err the blog posted about the my evil twin hack technique
In this post they detail how to hack plugins nicely and provide an example on how to hack attachment_fu. It turns out that I have been spending quite a bit of time with attachment_fu on various projects recently and have started to need it to do slightly different things.
Below is a hack I have written to improve validates_as_attachment. Using the evil twin technique this will just ask for a file to be uploaded if you dont upload anything. Instead of spewing out a whole load of errors that dont help the user much.
klass = Technoweenie::AttachmentFu::ClassMethods klass.module_eval do def validates_as_attachment validate :uploaded_data_is_present validates_presence_of :size, :content_type, :filename, :if => :uploaded_data? validate :attachment_attributes_valid? end end klazz = Technoweenie::AttachmentFu::InstanceMethods klazz.module_eval do def uploaded_data? return false unless filename true end # validates the size and content_type attributes according to the current model's options def attachment_attributes_valid? if uploaded_data? [:size, :content_type].each do |attr_name| enum = attachment_options[attr_name] errors.add attr_name, ActiveRecord::Errors.default_error_messages[:inclusion] unless enum.nil? || enum.include?(send(attr_name)) end end end def uploaded_data_is_present unless uploaded_data? errors.add_to_base("You must select a file to upload.") end end end
This serves as a drop in replacement for validates_as_attachment
