Paperclip doesn't work for derived classes
Reported by Mike Lapshin | April 14th, 2008 @ 05:35 AM
If attachment declared in base classes, exception is thrown when attachment is accessed in derived classes:
class User < ActiveRecord::Base
has_attached_file :avatar,
:styles => { :small => "30x30", :big => "100x100" }
end
class RegularUser < User
end
class OpenIdUser < User
end
>> u = OpenIdUser.new
>> u.avatar
NoMethodError: You have a nil object when you didn't expect it!
You might have expected an instance of ActiveRecord::Base.
The error occurred while evaluating nil.[]
from /home/sotakone/.../vendor/plugins/paperclip/lib/paperclip.rb:174:in `attachment_for'
from /home/sotakone/.../vendor/plugins/paperclip/lib/paperclip.rb:124:in `avatar'
from (irb):2
I did some research and figured out that problem lies in @attachment_definitions class variable. To work with derived classes, it should be implemented via read/write_inheritable_attribute.
Comments and changes to this ticket
-
Jon Yurek April 15th, 2008 @ 05:26 PM
- → State changed from “new” to “open”
- → Assigned user changed from “” to “Jon Yurek”
D'oh! I'll have that fixed soon.
-
Jon Yurek April 16th, 2008 @ 10:42 AM
- → State changed from “open” to “resolved”
This is fixed in the latest version.
-
Akshay Surve November 10th, 2008 @ 05:15 AM
- → Tag changed from “” to “bug inheritance sti”
I am still getting a similar error. So:
>> u = OpenIdUser.new and >> u.avatar NoMethodError: You have a nil object when you didn't expect it! You might have expected an instance of ActiveRecord::Base. The error occurred while evaluating nil.[] from /Users/ak47surve/Documents/projects/ssync/vendor/plugins/paperclip/lib/paperclip.rb:246:in `attachment_for' from /Users/ak47surve/Documents/projects/ssync/vendor/plugins/paperclip/lib/paperclip.rb:154:in `avatar' from (irb):2While
.avataron User.new works as intended.
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