Rails - rake 测试失败

Question

使用以下语句：

rails generate scaffold Product title:string description:text image_url:string price:decimal

并稍微编辑生成的迁移，我得到了以下迁移：

class CreateProducts < ActiveRecord::Migration
  def change
    create_table :products do |t|
      t.string :title
      t.text :description
      t.string :image_url
      t.decimal :price, precision: 8, scale: 2

      t.timestamps
    end
  end
end

之后，我成功运行了以下命令：

rake db:migrate

并连接到我的数据库并检查该表是否已创建。然后，我运行

rake test

并得到了很多错误，我认为问题的根源是 rails 无法找到“产品”表：

 1) Error:
test_should_create_product(ProductsControllerTest):
ActiveRecord::JDBCError: Table products does not exist
    arjdbc/jdbc/RubyJdbcConnection.java:115:in `columns'
    /home/gotqn/.rvm/gems/jruby-1.7.2/gems/activerecord-jdbc-adapter-1.2.7/lib/arjdbc/db2/adapter.rb:514:in `columns'
    /home/gotqn/.rvm/gems/jruby-1.7.2/gems/activerecord-3.2.12/lib/active_record/fixtures.rb:660:in `column_names'
    /home/gotqn/.rvm/gems/jruby-1.7.2/gems/activerecord-3.2.12/lib/active_record/fixtures.rb:651:in `timestamp_column_names'
    /home/gotqn/.rvm/gems/jruby-1.7.2/gems/activerecord-3.2.12/lib/active_record/fixtures.rb:585:in `table_rows'
    org/jruby/RubyHash.java:1257:in `each'
    org/jruby/RubyEnumerable.java:718:in `map'
    /home/gotqn/.rvm/gems/jruby-1.7.2/gems/activerecord-3.2.12/lib/active_record/fixtures.rb:579:in `table_rows'
    /home/gotqn/.rvm/gems/jruby-1.7.2/gems/activerecord-3.2.12/lib/active_record/fixtures.rb:494:in `create_fixtures'
    org/jruby/RubyArray.java:1613:in `each'
    /home/gotqn/.rvm/gems/jruby-1.7.2/gems/activerecord-3.2.12/lib/active_record/fixtures.rb:492:in `create_fixtures'
    /home/gotqn/.rvm/gems/jruby-1.7.2/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/database_statements.rb:192:in `transaction'
    /home/gotqn/.rvm/gems/jruby-1.7.2/gems/activerecord-3.2.12/lib/active_record/fixtures.rb:491:in `create_fixtures'
    /home/gotqn/.rvm/gems/jruby-1.7.2/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract_adapter.rb:168:in `disable_referential_integrity'
    /home/gotqn/.rvm/gems/jruby-1.7.2/gems/activerecord-3.2.12/lib/active_record/fixtures.rb:476:in `create_fixtures'
    /home/gotqn/.rvm/gems/jruby-1.7.2/gems/activerecord-3.2.12/lib/active_record/fixtures.rb:895:in `load_fixtures'
    /home/gotqn/.rvm/gems/jruby-1.7.2/gems/activerecord-3.2.12/lib/active_record/fixtures.rb:849:in `setup_fixtures'
    /home/gotqn/.rvm/gems/jruby-1.7.2/gems/activesupport-3.2.12/lib/active_support/callbacks.rb:432:in `_run__858744690__setup__1004892786__callbacks'
    org/jruby/RubyBasicObject.java:1659:in `__send__'
    org/jruby/RubyKernel.java:2086:in `send'
    /home/gotqn/.rvm/gems/jruby-1.7.2/gems/activesupport-3.2.12/lib/active_support/callbacks.rb:405:in `__run_callback'
    /home/gotqn/.rvm/gems/jruby-1.7.2/gems/activesupport-3.2.12/lib/active_support/callbacks.rb:390:in `_run_setup_callbacks'
    org/jruby/RubyBasicObject.java:1659:in `__send__'
    org/jruby/RubyKernel.java:2086:in `send'
    /home/gotqn/.rvm/gems/jruby-1.7.2/gems/activesupport-3.2.12/lib/active_support/callbacks.rb:81:in `run_callbacks'
    /home/gotqn/.rvm/gems/jruby-1.7.2/gems/activesupport-3.2.12/lib/active_support/testing/setup_and_teardown.rb:35:in `run'

据我了解，在进行测试时，我的“测试”数据库被删除，“开发”数据库的迁移适用于它。因为，我使用的是“IBM DB2 Express 10.1”数据库，所以我想我需要对负责测试的文件进行一些更改。

你能帮我解决这个问题吗？

下面，我展示了更多关于整个情况的信息：

1. 使用“IBM DB2 Express”10.1 版
2. 使用 jRuby 1.7.2
3. 使用 Rails 版本 3.2.12
4. 使用 Ubuntu 10.04 LTC
5. 这就是我的“database.yml”文件的样子：

development:
    adapter: jdbc
    driver: com.ibm.db2.jcc.DB2Driver
    url: jdbc:db2://localhost:50000/ddevelop
    host: localhost
    port: 50000
    database: ddevelop
    username: db2inst1
    password: pass

test:
    adapter: jdbc
    driver: com.ibm.db2.jcc.DB2Driver
    url: jdbc:db2://localhost:50000/dtest
    host: localhost
    port: 50000
    database: dtest
    username: db2inst1
    password: pass

注意：“dtest”数据库已经创建。

Answer 1

测试数据库尚未更新。您需要在rake db:migration 之后运行rake db:test:prepare。您现在可以运行它，然后重试。