问题
I have changed my paperclip styles and want to refresh them on heroku. I do as
heroku run rake --trace paperclip:refresh CLASS=VenueImage
and get the error
** Invoke paperclip:refresh (first_time)
** Invoke paperclip:refresh:metadata (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute paperclip:refresh:metadata
rake aborted!
uninitialized constant VenueImage
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/ext/module.rb:36:in `const_missing'
/app/vendor/bundle/ruby/1.9.1/gems/paperclip-2.7.0/lib/paperclip.rb:179:in `block in class_for'
/app/vendor/bundle/ruby/1.9.1/gems/paperclip-2.7.0/lib/paperclip.rb:178:in `each'
/app/vendor/bundle/ruby/1.9.1/gems/paperclip-2.7.0/lib/paperclip.rb:178:in `inject'
/app/vendor/bundle/ruby/1.9.1/gems/paperclip-2.7.0/lib/paperclip.rb:178:in `class_for'
/app/vendor/bundle/ruby/1.9.1/gems/paperclip-2.7.0/lib/tasks/paperclip.rake:10:in `obtain_attachments'
/app/vendor/bundle/ruby/1.9.1/gems/paperclip-2.7.0/lib/tasks/paperclip.rake:45:in `block (3 levels) in <top (required)>'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `call'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `block in execute'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `each'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `execute'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:158:in `block in invoke_with_call_chain'
/usr/local/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:176:in `block in invoke_prerequisites'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:174:in `each'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:174:in `invoke_prerequisites'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:157:in `block in invoke_with_call_chain'
/usr/local/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/task.rb:144:in `invoke'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:116:in `invoke_task'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `block (2 levels) in top_level'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `each'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `block in top_level'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:88:in `top_level'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:66:in `block in run'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/lib/rake/application.rb:63:in `run'
/app/vendor/bundle/ruby/1.9.1/gems/rake-0.9.2.2/bin/rake:33:in `<top (required)>'
/app/vendor/bundle/ruby/1.9.1/bin/rake:19:in `load'
/app/vendor/bundle/ruby/1.9.1/bin/rake:19:in `<main>'
Tasks: TOP => paperclip:refresh => paperclip:refresh:metadata
Now given that class VenueImage definitely exists.
heroku run console
Loading production environment (Rails 3.2.2)
irb(main):001:0> VenueImage
=> VenueImage(id: integer, venue_id: integer, image_file_name: string,
image_content_type: string, image_file_size: integer,
image_updated_at: datetime, created_at: datetime, updated_at: datetime)
What could be going on here?
来源：https://stackoverflow.com/questions/9841317/rake-papercliprefresh-not-working-on-heroku