DB上的错误：迁移“未初始化的常量DeviseCreateUsers”
我正在尝试在Heroku上运行rake db：migrate命令，我遇到了这个问题。
uninitialized constant DeviseCreateUsers /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.11/lib/active_support/inflector/methods.rb:230:in `block in constantize' /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.11/lib/active_support/inflector/methods.rb:229:in `each' /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.11/lib/active_support/inflector/methods.rb:229:in `constantize' /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.11/lib/active_support/core_ext/string/inflections.rb:54:in `constantize' /app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.11/lib/active_record/migration.rb:538:in `load_migration' /app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.11/lib/active_record/migration.rb:533:in `migration' /app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.11/lib/active_record/migration.rb:528:in `migrate' /app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.11/lib/active_record/migration.rb:720:in `block (2 levels) in migrate' /app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.11/lib/active_record/migration.rb:775:in `call' /app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.11/lib/active_record/migration.rb:775:in `block in ddl_transaction' /app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.11/lib/active_record/connection_adapters/abstract/database_statements.rb:192:in `transaction' /app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.11/lib/active_record/transactions.rb:208:in `transaction' /app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.11/lib/active_record/migration.rb:775:in `ddl_transaction' /app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.11/lib/active_record/migration.rb:719:in `block in migrate' /app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.11/lib/active_record/migration.rb:700:in `each' /app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.11/lib/active_record/migration.rb:700:in `migrate' /app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.11/lib/active_record/migration.rb:570:in `up' /app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.11/lib/active_record/migration.rb:551:in `migrate' /app/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.11/lib/active_record/railties/databases.rake:179:in `block (2 levels) in ' 以下是我的Devise创建用户方法的全文，该方法似乎导致了此问题。
class AddDeviseToCustomers false, :default => "" t.string :encrypted_password, :null => false, :default => "" ## Recoverable t.string :reset_password_token t.datetime :reset_password_sent_at ## Rememberable t.datetime :remember_created_at ## Trackable t.integer :sign_in_count, :default => 0 t.datetime :current_sign_in_at t.datetime :last_sign_in_at t.string :current_sign_in_ip t.string :last_sign_in_ip t.string :confirmation_token t.datetime :confirmed_at t.datetime :confirmation_sent_at ## Confirmable #t.string :unconfirmed_email # Only if using reconfirmable ## Lockable # t.integer :failed_attempts, :default => 0 # Only if lock strategy is :failed_attempts # t.string :unlock_token # Only if unlock strategy is :email or :both # t.datetime :locked_at ## Token authenticatable # t.string :authentication_token # Uncomment below if timestamps were not included in your original model. # t.timestamps add_index :users, :email, :unique => true add_index :users, :reset_password_token, :unique => true # add_index :users, :confirmation_token, :unique => true # add_index :users, :unlock_token, :unique => true # add_index :users, :authentication_token, :unique => true end end end
这一切都在heroku上的pgsql服务器上。 提前致谢
如果您已重命名迁移的类名并且未重命名迁移文件名，则会发生这种情况。
例如，如果迁移类名称
AddDeviseToCustomers
那么迁移文件名应该是
201307220112_add_devise_to_customers.rb