问题
Paperclip produces this error, after checking out the plugin's rails3 branch. My Gemfile has following line:
gem 'paperclip', :git => 'http://github.com/thoughtbot/paperclip.git', :branch => 'rails3'
And the error message is:
NoMethodError: undefined method `has_attached_file' for #<Class:0x2a50530>
回答1:
Update 06-21-10: the thoughtbot version has been fixed.
I had to add Paperclip::Railtie.insert to my application.rb at the end of class Application < Rails::Application to get it to work correctly. I have deleted my fork since the official repo is working. Hope that helps someone.
You will also need to add the following to your Gemfile
gem "paperclip", :git => "http://github.com/thoughtbot/paperclip.git"
回答2:
I have a paperclip fork, you can try if it will work at your end, just change your Gemfile:
gem 'paperclip', :git => 'git://github.com/lmumar/paperclip.git', :branch => 'rails3'
Don't forget to run bundle install after updating your Gemfile.
Hope it will fix your problems.
lmumar
回答3:
minter's fork worked for me:
gem 'paperclip', :git => 'http://github.com/minter/paperclip.git', :branch => 'rails3'
回答4:
That didn't work for me. I have done below things and it is working perfectly:
- Add "Paperclip::Railtie.insert" in application.rb
- Add "config.gem 'paperclip'" in development.rb
回答5:
it works with Jason King's paperclip version:
gem 'paperclip', :git => 'http://github.com/JasonKing/paperclip.git', :branch => 'rails3'
来源：https://stackoverflow.com/questions/2743902/nomethoderror-undefined-method-has-attached-file