mysql + ruby​​ = 噩梦

Question

好的，我说完了。 我不明白为什么会出现此错误：

rake features

这不可能是我无法连接到 mysql 原因：

rake db:migrate

完美运行。

我一直有这个错误：

rake features --trace
(in /Users/myname/Projects/rails_app)
** Invoke features (first_time)
** Invoke db:test:prepare (first_time)
** Invoke db:abort_if_pending_migrations (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute db:abort_if_pending_migrations
** Execute db:test:prepare
** Invoke db:test:load (first_time)
** Invoke db:test:purge (first_time)
** Invoke environment 
** Execute db:test:purge
** Execute db:test:load
** Invoke db:schema:load (first_time)
** Invoke environment 
** Execute db:schema:load
rake aborted!
closed stream
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/mysql.rb:1032:in `sync='
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/mysql.rb:1032:in `write'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/mysql.rb:1092:in `finalizer'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/mysql.rb:578:in `call'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/mysql.rb:578:in `start'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/mysql.rb:578:in `free'
/Users/myname/Projects/rails_app/vendor/rails/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb:438:in `tables'
/Users/myname/Projects/rails_app/vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb:24:in `table_exists?'
/Users/myname/Projects/rails_app/vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb:106:in `create_table'
/Users/myname/Projects/rails_app/vendor/rails/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb:473:in `create_table'
/Users/myname/Projects/rails_app/vendor/rails/activerecord/lib/active_record/migration.rb:352:in `send'
/Users/myname/Projects/rails_app/vendor/rails/activerecord/lib/active_record/migration.rb:352:in `method_missing'
/Users/myname/Projects/rails_app/vendor/rails/activerecord/lib/active_record/migration.rb:328:in `say_with_time'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/benchmark.rb:293:in `measure'
/Users/myname/Projects/rails_app/vendor/rails/activerecord/lib/active_record/migration.rb:328:in `say_with_time'
/Users/myname/Projects/rails_app/vendor/rails/activerecord/lib/active_record/migration.rb:348:in `method_missing'
/Users/myname/Projects/rails_app/db/schema.rb:38
/Users/myname/Projects/rails_app/vendor/rails/activerecord/lib/active_record/schema.rb:43:in `instance_eval'
/Users/myname/Projects/rails_app/vendor/rails/activerecord/lib/active_record/schema.rb:43:in `define'
/Users/myname/Projects/rails_app/db/schema.rb:12
/Users/myname/Projects/rails_app/vendor/rails/activesupport/lib/active_support/dependencies.rb:145:in `load_without_new_constant_marking'
/Users/myname/Projects/rails_app/vendor/rails/activesupport/lib/active_support/dependencies.rb:145:in `load'
/Users/myname/Projects/rails_app/vendor/rails/activesupport/lib/active_support/dependencies.rb:521:in `new_constants_in'
/Users/myname/Projects/rails_app/vendor/rails/activesupport/lib/active_support/dependencies.rb:145:in `load'
/Users/myname/Projects/rails_app/vendor/rails/railties/lib/tasks/databases.rake:259
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `call'
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `execute'
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `each'
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `execute'
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:597:in `invoke_with_call_chain'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/monitor.rb:242:in `synchronize'
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain'
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:583:in `invoke'
/Users/myname/Projects/rails_app/vendor/rails/railties/lib/tasks/databases.rake:304
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `call'
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `execute'
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `each'
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `execute'
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:597:in `invoke_with_call_chain'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/monitor.rb:242:in `synchronize'
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain'
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:583:in `invoke'
/Users/myname/Projects/rails_app/vendor/rails/railties/lib/tasks/databases.rake:378
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `call'
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `execute'
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `each'
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `execute'
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:597:in `invoke_with_call_chain'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/monitor.rb:242:in `synchronize'
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain'
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:607:in `invoke_prerequisites'
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:604:in `each'
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:604:in `invoke_prerequisites'
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:596:in `invoke_with_call_chain'
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/monitor.rb:242:in `synchronize'
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain'
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:583:in `invoke'
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:2051:in `invoke_task'
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level'
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `each'
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level'
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:2023:in `top_level'
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:2001:in `run'
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/lib/rake.rb:1998:in `run'
/Users/myname/.gem/ruby/1.8/gems/rake-0.8.7/bin/rake:31
/usr/bin/rake:19:in `load'
/usr/bin/rake:19

我的机器： Mac OS X 10.5.8 ruby 1.8.6 (2008-08-11 patchlevel 287) [universal-darwin9.0] 导轨 2.3.4 mysql (2.8.1) [rubygem] Mysql路径：/opt/local/lib/mysql5 [通过macport安装]

非常感谢！

Answer 1

保存您的数据库并重新安装 mysql。关注http://hivelogic.com/articles/compiling-mysql-on-snow-leopard/让我所有的问题都消失了。

Answer 2

我必须对您的问题进行理论分析，但没有理由怀疑两者确实是您的原因，但它们是快速检查。

1. 你没有在config/databases.yml中正确定义测试数据库

2. 试图建立这个数据库的 mysql 用户没有这样做的权限。

Answer 3

您能否使用相关凭据（database.yml 中的所有内容）连接到相关数据库？
命令行中的“mysql -u your_user -p”？

当您安装 mysql gem 时，它是否正确构建了本机扩展？ 当您 gem install mysql --force （重新安装它）时会发生什么？看起来很幸福吗？

你以前做过吗？问题可能是缺乏 rails/mysql 经验还是两者兼而有之？还是这顶旧帽子，你这次想不通？

如果是前者，那么使用 Rails 进行实用敏捷 Web 开发的教程非常好（本书的其余部分也是如此）。

希望那里有帮助。

Answer 4

请告诉输出：

rake db:schema:load RAILS_ENV=test

确保名为 _test 的现有数据库已配置并在 config/database.yml 下运行