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有以下迁移：
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是否确实创建了表。然后，我跑
rake test
并得到了很多错误，我相信问题的根源是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，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，我展示了有关整个情况的更多信息：
- 使用“IBM DB2 Express”版本 10.1
- 使用 jRuby 1.7.2
- 使用 Rails 版本 3.2.12
- 使用 Ubuntu 10.04 LTC
- 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。