Rails rake db: перенос прерываний с помощью сгенерированной модели

Может кто-нибудь сказать мне, что я сделал неправильно?

Я побежал script/generate model CityZipMSA city:string state:string zip:integer MSA:integer

И затем запустил rake db:migrate, и я получил следующую ошибку

(в/Пользователи/MMyself/app_dev/property) грабли прерваны! Произошла ошибка, эта и все последующие миграции отменены:

неинициализированная константа CreateCityZipMsas

Мой файл миграции:

    class CreateCityZipMSAs < ActiveRecord::Migration
  def self.up
    create_table :city_zip_msas do |t|
      t.string :city
      t.string :state
      t.integer :zip
      t.integer :MSA

      t.timestamps
    end
  end

  def self.down
    drop_table :city_zip_msas
  end
end

Когда я запускаю rake db:migrate --trace

Я получаю

(в/Пользователи/MMyself/app_dev/property) ** Вызов db: migrate (first_time) ** Вызывать среду (first_time) ** Выполнить среду ** Выполнить db: мигрировать грабли прерваны! Произошла ошибка, эта и все последующие миграции отменены:

неинициализированная константа CreateCityZipMsas /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/activesupport-2.3.8/lib/active_support/dependencies.rb:443:in load_missing_constant' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/activesupport-2.3.8/lib/active_support/dependencies.rb:80:in const_missing ' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/activesupport-2.3.8/lib/active_support/dependencies.rb:92:in const_missing' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/activesupport-2.3.8/lib/active_support/inflector.rb:364:in constantize ' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/activesupport-2.3.8/lib/active_support/inflector.rb:363:in each' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/activesupport-2.3.8/lib/active_support/inflector.rb:363:in constantize ' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/activesupport-2.3.8/lib/active_support/core_ext/string/inflections.rb:162:in constantize' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/activerecord-2.3.8/lib/active_record/migration.rb:374:in load_migration ' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/activerecord-2.3.8/lib/active_record/migration.rb:369:in migration' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/activerecord-2.3.8/lib/active_record/migration.rb:365:in migrate ' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/activerecord-2.3.8/lib/active_record/migration.rb:491 /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/activerecord-2.3.8/lib/active_record/migration.rb:565:in call' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/activerecord-2.3.8/lib/active_record/migration.rb:565:in ddl_transaction ' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/activerecord-2.3.8/lib/active_record/connection_adapters/abstract/database_statements.rb:136:in transaction' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/activerecord-2.3.8/lib/active_record/transactions.rb:182:in transaction ' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/activerecord-2.3.8/lib/active_record/migration.rb:565:in ddl_transaction' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/activerecord-2.3.8/lib/active_record/migration.rb:490:in migrate ' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/activerecord-2.3.8/lib/active_record/migration.rb:477:in each' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/activerecord-2.3.8/lib/active_record>/migration.rb:477:in migrate ' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/activerecord-2.3.8/lib/active_record/migration.rb:401:in up' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/activerecord-2.3.8/lib/active_record/migration.rb:383:in migrate ' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/rails-2.3.8/lib/tasks/databases.rake:112 /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/rake-0.8.7/lib/rake.rb:636:in call' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/rake-0.8.7/lib/rake.rb:636:in выполнить ' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/rake-0.8.7/lib/rake.rb:631:in each' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/rake-0.8.7/lib/rake.rb:631:in выполнить ' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/rake-0.8.7/lib/rake.rb:597:in invoke_with_call_chain' /Users/MMyself/.rvm/rubies/ruby-1.8.7-p249/lib/ruby/1.8/monitor.rb:242:in synchronize ' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/rake-0.8.7/lib/rake.rb:590:in invoke_with_call_chain' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/rake-0.8.7/lib/rake.rb:583:in invoke ' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/rake-0.8.7/lib/rake.rb:2051:in invoke_task' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/rake-0.8.7/lib/rake.rb:2029:in top_level ' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/rake-0.8.7/lib/rake.rb:2029:in each' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/rake-0.8.7/lib/rake.rb:2029:in top_level ' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/rake-0.8.7/lib/rake.rb:2068:in standard_exception_handling' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/rake-0.8.7/lib/rake.rb:2023:in top_level ' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/rake-0.8.7/lib/rake.rb:2001:in run' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/rake-0.8.7/lib/rake.rb:2068:in standard_exception_handling ' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/rake-0.8.7/lib/rake.rb:1998:in run' /Users/MMyself/.rvm/gems/ruby-1.8.7-p249/gems/rake-0.8.7/bin/rake:31 /Users/MMyself/.rvm/rubies/ruby-1.8.7-p249/bin/rake:24:in загрузить ' /Users/MMyself/.rvm/rubies/ruby-1.8.7-p249/bin/rake:24