rake 测试 - self.table_name 无法识别答案

【问题标题】：rake test - self.table_name not recognizedrake 测试 - self.table_name 无法识别
【发布时间】：2013-07-24 20:30:31
【问题描述】：

我有一个奇怪的错误。当我尝试运行单元测试时，它给了我以下错误：

test_the_truth(UpdateMainTest):
 ActiveRecord::StatementInvalid: Could not find table 'blacklists'
/var/lib/gems/1.9.1/gems/activerecord-3.2.13/lib/active_record/connection_adapters/sqlite_adapter.rb:472:in `table_structure'
/var/lib/gems/1.9.1/gems/activerecord-3.2.13/lib/active_record/connection_adapters/sqlite_adapter.rb:346:in `columns'
/var/lib/gems/1.9.1/gems/activerecord-3.2.13/lib/active_record/fixtures.rb:660:in `column_names'
/var/lib/gems/1.9.1/gems/activerecord-3.2.13/lib/active_record/fixtures.rb:652:in `timestamp_column_names'
/var/lib/gems/1.9.1/gems/activerecord-3.2.13/lib/active_record/fixtures.rb:585:in `block in table_rows'
/var/lib/gems/1.9.1/gems/activerecord-3.2.13/lib/active_record/fixtures.rb:579:in `each'
/var/lib/gems/1.9.1/gems/activerecord-3.2.13/lib/active_record/fixtures.rb:579:in `map'
/var/lib/gems/1.9.1/gems/activerecord-3.2.13/lib/active_record/fixtures.rb:579:in `table_rows'
/var/lib/gems/1.9.1/gems/activerecord-3.2.13/lib/active_record/fixtures.rb:494:in `block (3 levels) in create_fixtures'
/var/lib/gems/1.9.1/gems/activerecord-3.2.13/lib/active_record/fixtures.rb:492:in `each'
/var/lib/gems/1.9.1/gems/activerecord-3.2.13/lib/active_record/fixtures.rb:492:in `block (2 levels) in create_fixtures'
/var/lib/gems/1.9.1/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/database_statements.rb:192:in `transaction'
/var/lib/gems/1.9.1/gems/activerecord-3.2.13/lib/active_record/fixtures.rb:491:in `block in create_fixtures'
/var/lib/gems/1.9.1/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract_adapter.rb:168:in `disable_referential_integrity'
/var/lib/gems/1.9.1/gems/activerecord-3.2.13/lib/active_record/fixtures.rb:476:in `create_fixtures'
/var/lib/gems/1.9.1/gems/activerecord-3.2.13/lib/active_record/fixtures.rb:895:in `load_fixtures'
/var/lib/gems/1.9.1/gems/activerecord-3.2.13/lib/active_record/fixtures.rb:849:in `setup_fixtures'
/var/lib/gems/1.9.1/gems/activesupport-3.2.13/lib/active_support/callbacks.rb:407:in `_run__379848442555604621__setup__3487204981098397389__callbacks'
/var/lib/gems/1.9.1/gems/activesupport-3.2.13/lib/active_support/callbacks.rb:405:in `__run_callback'
/var/lib/gems/1.9.1/gems/activesupport-3.2.13/lib/active_support/callbacks.rb:385:in `_run_setup_callbacks'
/var/lib/gems/1.9.1/gems/activesupport-3.2.13/lib/active_support/callbacks.rb:81:in `run_callbacks'
/var/lib/gems/1.9.1/gems/activesupport-3.2.13/lib/active_support/testing/setup_and_teardown.rb:35:in `run'

这是我的黑名单模型：

class Blacklist < ActiveRecord::Base
  attr_accessible :abbreviation, :name
  self.table_name = "blacklist"
  validates :abbreviation, :presence => :true, :uniqueness => :true
  validates :name, :presence => :true
end

架构也正确地列出了表：

  create_table "blacklist", :force => true do |t|
    t.string   "name"
    t.string   "abbreviation"
    t.datetime "created_at",   :null => false
    t.datetime "updated_at",   :null => false
  end

我多次运行 rake db:test:prepare，但错误仍然存在。当我使用 rails 控制台时，我可以创建黑名单对象而不会出错。知道我能做什么吗？

【问题讨论】：

标签： ruby-on-rails database ruby-on-rails-3 rake

【解决方案1】：

使用复数形式的符号，表名应为复数：

self.table_name = :blacklists

用复数形式创建表名：

create_table "blacklists", :force => true do |t|
    t.string   "name"
    t.string   "abbreviation"
    t.datetime "created_at",   :null => false
    t.datetime "updated_at",   :null => false
  end

【讨论】：

感谢您的回答，但我特别指定 self.table_name 不必使用名称“黑名单”。如果有一个以非标准方式命名表的函数，它不应该能够正常运行吗？
使用 self.class.table_name。它可能会起作用。并在 attr_accessible 上方使用它。
都试过了。 self.class.table_name 给出了方法 table_name 在 Class:Class 中不可用的错误，并将其放在 attr_accessible 之前也不会进行更改。

【解决方案2】：

如果仅发生在您的单元测试中，则测试数据库可能已过时。你应该尝试重建它rake db:migrate db:test:clone

【讨论】：

【解决方案3】：

感谢您的所有帮助。

我无法真正追查问题的根源，但是当我注释掉 test_helper.rb 中加载所有夹具的行，错误没有再次出现。

【讨论】：