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
最佳答案
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" endFor 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。
关于MySQL 5.7.9、Rails 3.2、mysql2 0.3.20，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/33755062/
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我在从html页面生成PDF时遇到问题。我正在使用PDFkit。在安装它的过程中，我注意到我需要wkhtmltopdf。所以我也安装了它。我做了PDFkit的文档所说的一切......现在我在尝试加载PDF时遇到了这个错误。这里是错误:commandfailed:"/usr/local/bin/wkhtmltopdf""--margin-right""0.75in""--page-size""Letter""--margin-top""0.75in""--margin-bottom""0.75in""--encoding""UTF-8""--margin-left""0.75in""-
Rails2.3可以选择随时使用RouteSet#add_configuration_file添加更多路由。是否可以在Rails3项目中做同样的事情？ 最佳答案 在config/application.rb中:config.paths.config.routes在Rails3.2(也可能是Rails3.1)中，使用:config.paths["config/routes"] 关于ruby-on-rails-Rails3中的多个路由文件，我们在StackOverflow上找到一个类似的问题
给定这段代码defcreate@upgrades=User.update_all(["role=?","upgraded"],:id=>params[:upgrade])redirect_toadmin_upgrades_path,:notice=>"Successfullyupgradeduser."end我如何在该操作中实际验证它们是否已保存或未重定向到适当的页面和消息？ 最佳答案 在Rails3中，update_all不返回任何有意义的信息，除了已更新的记录数(这可能取决于您的DBMS是否返回该信息)。http://ar.ru