MySQL 5.7.9、Rails 3.2、mysql2 0.3.20

Question

我在升级到 MySQL 5.7.9(通过 brew 在 OSX 10.11 El Capitan 上安装)后遇到问题:我所有基于 Rails 3.2.* 的旧版应用程序都停止工作。

请注意，我将使用一个新应用程序作为示例，但我需要具有旧数据库的旧应用程序，而不是新应用程序。

$ rvm use 2.1.5
$ rails _3.2.22_ new r32-mysql2-test -d mysql
$ rails generate model Product name:string description:text
      invoke  active_record
/Users/user/.rvm/gems/ruby-2.1.5@global/gems/bundler-1.7.6/lib/bundler/rubygems_integration.rb:266:in `block in replace_gem': Please install the mysql2 adapter: `gem install activerecord-mysql2-adapter` (can't activate mysql2 (~> 0.3.10), already activated mysql2-0.4.1. Make sure all dependencies are added to Gemfile.) (LoadError)

mysql2 0.4.1 将不起作用，所以让我们将 gem 'mysql2', '~> 0.3.20' 添加到 Gemfile>/p>

$ rails generate model Product name:string description:text
      invoke  active_record
      create    db/migrate/20151117104219_create_products.rb
      create    app/models/product.rb
      invoke    test_unit
      create      test/unit/product_test.rb
      create      test/fixtures/products.yml

$ rake db:create db:migrate
==  CreateProducts: migrating =================================================
-- create_table(:products)
rake aborted!
StandardError: An error has occurred, all later migrations canceled:

Mysql2::Error: All parts of a PRIMARY KEY must be NOT NULL; if you need NULL in a key, use UNIQUE instead: CREATE TABLE `products` (`id` int(11) DEFAULT NULL auto_increment PRIMARY KEY, `name` varchar(255), `description` text, `created_at` datetime NOT NULL, `updated_at` datetime NOT NULL) ENGINE=InnoDB/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:245:in `query'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:245:in `block in execute'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract_adapter.rb:280:in `block in log'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activesupport-3.2.22/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract_adapter.rb:275:in `log'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:245:in `execute'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/connection_adapters/mysql2_adapter.rb:213:in `execute'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract/schema_statements.rb:170:in `create_table'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:434:in `create_table'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:466:in `block in method_missing'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:438:in `block in say_with_time'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:438:in `say_with_time'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:458:in `method_missing'
/Users/user/dev/r32-mysql2-test/db/migrate/20151117104219_create_products.rb:3:in `change'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:407:in `block (2 levels) in migrate'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:407:in `block in migrate'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract/connection_pool.rb:129:in `with_connection'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:389:in `migrate'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:528:in `migrate'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:720:in `block (2 levels) in migrate'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:777:in `call'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:777:in `ddl_transaction'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:719:in `block in migrate'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:700:in `each'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:700:in `migrate'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:570:in `up'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:551:in `migrate'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/railties/databases.rake:193:in `block (2 levels) in <top (required)>'
/Users/user/.rvm/gems/ruby-2.1.5/bin/ruby_executable_hooks:15:in `eval'
/Users/user/.rvm/gems/ruby-2.1.5/bin/ruby_executable_hooks:15:in `<main>'
ActiveRecord::StatementInvalid: Mysql2::Error: All parts of a PRIMARY KEY must be NOT NULL; if you need NULL in a key, use UNIQUE instead: CREATE TABLE `products` (`id` int(11) DEFAULT NULL auto_increment PRIMARY KEY, `name` varchar(255), `description` text, `created_at` datetime NOT NULL, `updated_at` datetime NOT NULL) ENGINE=InnoDB
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:245:in `query'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:245:in `block in execute'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract_adapter.rb:280:in `block in log'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activesupport-3.2.22/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract_adapter.rb:275:in `log'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:245:in `execute'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/connection_adapters/mysql2_adapter.rb:213:in `execute'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract/schema_statements.rb:170:in `create_table'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:434:in `create_table'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:466:in `block in method_missing'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:438:in `block in say_with_time'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:438:in `say_with_time'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:458:in `method_missing'
/Users/user/dev/r32-mysql2-test/db/migrate/20151117104219_create_products.rb:3:in `change'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:407:in `block (2 levels) in migrate'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:407:in `block in migrate'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract/connection_pool.rb:129:in `with_connection'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:389:in `migrate'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:528:in `migrate'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:720:in `block (2 levels) in migrate'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:777:in `call'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:777:in `ddl_transaction'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:719:in `block in migrate'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:700:in `each'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:700:in `migrate'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:570:in `up'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:551:in `migrate'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/railties/databases.rake:193:in `block (2 levels) in <top (required)>'
/Users/user/.rvm/gems/ruby-2.1.5/bin/ruby_executable_hooks:15:in `eval'
/Users/user/.rvm/gems/ruby-2.1.5/bin/ruby_executable_hooks:15:in `<main>'
Mysql2::Error: All parts of a PRIMARY KEY must be NOT NULL; if you need NULL in a key, use UNIQUE instead
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:245:in `query'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:245:in `block in execute'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract_adapter.rb:280:in `block in log'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activesupport-3.2.22/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract_adapter.rb:275:in `log'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:245:in `execute'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/connection_adapters/mysql2_adapter.rb:213:in `execute'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract/schema_statements.rb:170:in `create_table'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:434:in `create_table'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:466:in `block in method_missing'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:438:in `block in say_with_time'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:438:in `say_with_time'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:458:in `method_missing'
/Users/user/dev/r32-mysql2-test/db/migrate/20151117104219_create_products.rb:3:in `change'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:407:in `block (2 levels) in migrate'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:407:in `block in migrate'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract/connection_pool.rb:129:in `with_connection'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:389:in `migrate'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:528:in `migrate'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:720:in `block (2 levels) in migrate'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:777:in `call'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:777:in `ddl_transaction'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:719:in `block in migrate'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:700:in `each'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:700:in `migrate'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:570:in `up'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/migration.rb:551:in `migrate'
/Users/user/.rvm/gems/ruby-2.1.5/gems/activerecord-3.2.22/lib/active_record/railties/databases.rake:193:in `block (2 levels) in <top (required)>'
/Users/user/.rvm/gems/ruby-2.1.5/bin/ruby_executable_hooks:15:in `eval'
/Users/user/.rvm/gems/ruby-2.1.5/bin/ruby_executable_hooks:15:in `<main>'
Tasks: TOP => db:migrate
(See full trace by running task with --trace)

在不来回切换到 MySQL 5.6 的情况下，我可以做些什么来支持遗留数据库？

TIA

Answer 1

这是两年前为 Rails 修复的。我不确定哪个版本的 Rails 有修复。这里有几种不同的方法可以在旧版本的 Rails 中修复它:https://github.com/rails/rails/pull/13247#issuecomment-158787912

这是其中一种解决方案:

With Rails 2.3.5, MySQL version 5.7.9 and mysql gem you need to have this bit as an initializer in config/initializers/abstract_mysql_adapter.rb:

class ActiveRecord::ConnectionAdapters::MysqlAdapter  
  NATIVE_DATABASE_TYPES[:primary_key] = "int(11) auto_increment PRIMARY KEY"
end

For mysql2 it should be config/initializers/abstract_mysql2_adapter.rb:

class ActiveRecord::ConnectionAdapters::Mysql2Adapter  
  NATIVE_DATABASE_TYPES[:primary_key] = "int(11) auto_increment PRIMARY KEY" 
end

我想在 Rails 2 中你应该把它放在 environment.rb 而不是初始化器中。

对我来说，至少有一个 rake 任务仍然因该修复而失败，我必须在 rake 任务本身中打补丁或要求打补丁。 I read that不依赖于环境的 rake 任务不会加载初始值设定项或 environment.rb，所以也许这就是原因。也许这只是特定于此代码库...

希望其中一个解决方案可行，但如果不行，那么另一种可能的临时解决方法是猴子修补 ActiveRecord 以修复该常量(在 lib/active_record/connection_adapters/abstract_mysql_adapter.rb 中)。

如果您使用 activerecord-mysql2-adapter gem，那么您可能也需要修复它。 (查看 activerecord-mysql2-adapter-{GEM VERSION}/lib/active_record/connection_adapters/mysql2_adapter.rb )。虽然，我在使用该 gem 时遇到了其他问题，甚至可能不需要它。