Mysql2 ::错误：重复条目”为密钥’index_admin_users_on_email’Ruby on Rails错误
我试图在我从github获得的rails代码上运行ruby，我最后使用自制程序安装mysql，然后最终直接从http://dev.mysql.com/安装它。 直到那时我才在应用程序文件中使用rake，测试开始运行。 但是，现在我继续得到这个Mysql2 ::错误：重复条目，我不明白为什么。 可能是因为我的计算机上有两个不同位置的mysq？ 我不确定导致此问题的原因是因为所有表都是空的。 我该如何解决这个问题？ 谢谢你的帮忙。 我是Ruby on Rails和Mysql的新手。
堆栈如下所示：
HomeControllerTest test_should_get_index ERROR Mysql2::Error: Duplicate entry '' for key 'index_admin_users_on_email': INSERT INTO `admin_users` (`created_at`, `updated_at`, `id`) VALUES ('2011-12-09 09:33:30', '2011-12-09 09:33:30', 298486374) STDERR: Exception `ActiveRecord::RecordNotUnique' at /Users/nick01s/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.1.3/lib/active_record/connection_adapters/mysql2_adapter.rb:283:in `query' /Users/nick01s/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.1.3/lib/active_record/connection_adapters/mysql2_adapter.rb:283:in `block in execute' /Users/nick01s/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.1.3/lib/active_record/connection_adapters/abstract_adapter.rb:244:in `block in log' /Users/nick01s/.rvm/gems/ruby-1.9.3-p0/gems/activesupport-3.1.3/lib/active_support/notifications/instrumenter.rb:21:in `instrument' /Users/nick01s/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.1.3/lib/active_record/connection_adapters/abstract_adapter.rb:239:in `log' /Users/nick01s/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.1.3/lib/active_record/connection_adapters/mysql2_adapter.rb:283:in `execute' /Users/nick01s/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.1.3/lib/active_record/connection_adapters/abstract/database_statements.rb:302:in `insert_fixture' /Users/nick01s/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.1.3/lib/active_record/fixtures.rb:486:in `block (5 levels) in create_fixtures' /Users/nick01s/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.1.3/lib/active_record/fixtures.rb:485:in `each' /Users/nick01s/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.1.3/lib/active_record/fixtures.rb:485:in `block (4 levels) in create_fixtures' /Users/nick01s/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.1.3/lib/active_record/fixtures.rb:484:in `each' /Users/nick01s/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.1.3/lib/active_record/fixtures.rb:484:in `block (3 levels) in create_fixtures' /Users/nick01s/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.1.3/lib/active_record/fixtures.rb:476:in `each' /Users/nick01s/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.1.3/lib/active_record/fixtures.rb:476:in `block (2 levels) in create_fixtures' /Users/nick01s/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.1.3/lib/active_record/connection_adapters/abstract/database_statements.rb:192:in `transaction' /Users/nick01s/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.1.3/lib/active_record/fixtures.rb:475:in `block in create_fixtures' /Users/nick01s/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.1.3/lib/active_record/connection_adapters/mysql2_adapter.rb:202:in `disable_referential_integrity' /Users/nick01s/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.1.3/lib/active_record/fixtures.rb:460:in `create_fixtures' /Users/nick01s/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.1.3/lib/active_record/fixtures.rb:924:in `load_fixtures' /Users/nick01s/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.1.3/lib/active_record/fixtures.rb:890:in `setup_fixtures' /Users/nick01s/.rvm/gems/ruby-1.9.3-p0/gems/activesupport-3.1.3/lib/active_support/callbacks.rb:413:in `_run_setup_callbacks' /Users/nick01s/.rvm/gems/ruby-1.9.3-p0/gems/activesupport-3.1.3/lib/active_support/callbacks.rb:81:in `run_callbacks' /Users/nick01s/.rvm/gems/ruby-1.9.3-p0/gems/activesupport-3.1.3/lib/active_support/testing/setup_and_teardown.rb:34:in `run' 这两个mysql安装不太可能导致这个问题。 Rails应该只连接到一个数据库。 您可能不知道它连接到哪一个，但它需要额外的工作才能连接到多个数据库。
在测试中的灯具坏了之前，我已经看到了重复键错误。
在您的堆栈跟踪中，它看起来像是某些东西（灯具或工厂）正在尝试创建没有必填字段的admin_user。 两次。
它第二次抛出exception，因为索引设置为唯一。
对于其他任何人都会收到此错误，这归结为（对我而言）将active_admin安装到现有项目中。
admin_users.yml fixture文件由rails初始化以插入两个空记录：
# Read about fixtures at http://api.rubyonrails.org/classes/ActiveRecord/Fixtures.html # This model initially had no columns defined. If you add columns to the # model remove the '{}' from the fixture names and add the columns immediately # below each fixture, per the syntax in the comments below # one: {} # column: value # two: {} # column: value
注释掉/删除这些空插入为我修复了错误。