I'm using paperclip in a rails app and have the following three validations in my model
validates_attachment_presence :photo
validates_attachment_size :photo, :less_than=>1.megabyte
validates_attachment_content_type :photo, :content_type=>['image/jpeg', 'image/png', 'image/gif']
If the user forgets to add an attachment, all three validations fail and thus, the user is presented with the following three errors:
# Photo file name must be set.
# Photo file size file size must be between 0 and 1048576 bytes.
# Photo content type is not included in the list
I think it would be best to just show the first error in this instance since the other two errors are purely consequential... I would prefer the user to only ever see the second two errors if an attachment has been added but doesn't meet the validation criteria.
I'm certain there is no pre-baked validation that does this sort of thing and from reading the code in vendor/plugins/paperclip/lib/paperclip.rb I see that the validates_attachment_size method supports the :unless parameter as shown:
def validates_attachment_presence name, options = {}
message = options[:message] || "must be set."
validates_presence_of :"#{name}_file_name",
:message => message,
:if => options[:if],
:unless => options[:unless]
end
So, I was thinking that I could do something like the following:
validates_attachment_size :photo, :less_than=>1.megabyte, :unless=> :photo.blank
But that breaks the app. Anyone have any experience of doing this sort of thing? Would be a nice contribution to the paperclip source code.
EDIT:
I've tried using this:
validates_attachment_size :photo, :less_than=>1.megabyte,
:unless=> Proc.new { |image| image[:photo].nil? }
It doesn't quite work though as I've just managed to upload a 5mb mp3 with this validation in place. But it's promising as the error message doesn't appear when the user has not attached a photo.
validates_attachment_size :photo, :less_than => 1.megabyte,
:unless => Proc.new { |imports| imports.photo_file_name.blank? }
I think you can do it other way. Don't mess with validations. You probably have something like this in your form:
<%= f.error_messages %>
You can remove it and write your own helper to display error messages. Errors are stored in hash:
@photo.errors
Or if you want to get to them through form builder:
f.object.errors
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