Paperclip 2.6.0レーキを中止しました！ unitialized constant AddAvatarColumnsToUserエラー

Question

私は、Paperclipをインストールしてデータベースを移行しようとするとエラーが発生するため、Quickstart on Githubに従っています。私は以下の端末からのエラーを含んでいます。私はMac OSXを使用しています。私はこれがImagemagickとは関係があるとは思うが確かではない。私はpaperclip 2.6.0とRails 3.2.0を持っています。誰かが答えを知っていれば、私は何時間もの検索の後で見つけられなかったので、信じられないほど感謝しています。

Timothy-Muellers-MacBook-Pro:Publishr tmuelle1$ rake db:migrate --trace 
    ** Invoke db:migrate (first_time) 
    ** Invoke environment (first_time) 
    ** Execute environment 
    ** Invoke db:load_config (first_time) 
    ** Invoke rails_env (first_time) 
    ** Execute rails_env 
    ** Execute db:load_config 
    ** Execute db:migrate 
    rake aborted! 
    An error has occurred, this and all later migrations canceled: 

    uninitialized constant AddAvatarColumnsToUsers 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/activesupport-3.2.0.rc1/lib/active_support/inflector/methods.rb:226:in `block in constantize' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/activesupport-3.2.0.rc1/lib/active_support/inflector/methods.rb:225:in `each' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/activesupport-3.2.0.rc1/lib/active_support/inflector/methods.rb:225:in `constantize' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/activesupport-3.2.0.rc1/lib/active_support/core_ext/string/inflections.rb:54:in `constantize' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/activerecord-3.2.0.rc1/lib/active_record/migration.rb:521:in `load_migration' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/activerecord-3.2.0.rc1/lib/active_record/migration.rb:516:in `migration' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/activerecord-3.2.0.rc1/lib/active_record/migration.rb:511:in `migrate' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/activerecord-3.2.0.rc1/lib/active_record/migration.rb:696:in `block (2 levels) in migrate' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/activerecord-3.2.0.rc1/lib/active_record/migration.rb:751:in `call' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/activerecord-3.2.0.rc1/lib/active_record/migration.rb:751:in `block in ddl_transaction' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/activerecord-3.2.0.rc1/lib/active_record/connection_adapters/abstract/database_statements.rb:190:in `transaction' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/activerecord-3.2.0.rc1/lib/active_record/transactions.rb:208:in `transaction' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/activerecord-3.2.0.rc1/lib/active_record/migration.rb:751:in `ddl_transaction' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/activerecord-3.2.0.rc1/lib/active_record/migration.rb:695:in `block in migrate' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/activerecord-3.2.0.rc1/lib/active_record/migration.rb:676:in `each' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/activerecord-3.2.0.rc1/lib/active_record/migration.rb:676:in `migrate' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/activerecord-3.2.0.rc1/lib/active_record/migration.rb:553:in `up' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/activerecord-3.2.0.rc1/lib/active_record/migration.rb:534:in `migrate' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/activerecord-3.2.0.rc1/lib/active_record/railties/databases.rake:152:in `block (2 levels) in <top (required)>' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `call' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `block in execute' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `each' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `execute' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/rake-0.9.2.2/lib/rake/task.rb:158:in `block in invoke_with_call_chain' 
    /Users/tmuelle1/.rvm/rubies/ruby-1.9.2-head/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/rake-0.9.2.2/lib/rake/task.rb:151:in `invoke_with_call_chain' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/rake-0.9.2.2/lib/rake/task.rb:144:in `invoke' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/rake-0.9.2.2/lib/rake/application.rb:116:in `invoke_task' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `block (2 levels) in top_level' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `each' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `block in top_level' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/rake-0.9.2.2/lib/rake/application.rb:88:in `top_level' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/rake-0.9.2.2/lib/rake/application.rb:66:in `block in run' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/rake-0.9.2.2/lib/rake/application.rb:63:in `run' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/gems/rake-0.9.2.2/bin/rake:33:in `<top (required)>' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/bin/rake:19:in `load' 
    /Users/tmuelle1/.rvm/gems/ruby-1.9.2-head@rails3tutorial/bin/rake:19:in `<main>' 
    Tasks: TOP => db:migrate 

Answer 1

これは私の間違いでした。私のusersテーブルはuserではなくusersと呼ばれています。

class AddAvatarColumnsToUser < ActiveRecord::Migration 

むしろ

class AddAvatarColumnsToUsers < ActiveRecord::Migration 

これは、エラーを引き起こすものであるよりも、私は誤って、彼らが持っていたものをそのままコピーし、クイックスタートガイドの移動方向にそれが言いました。