无法将 Ruby on Rails 应用程序与 Mysql 连接

【问题标题】：Cannot connect Ruby on Rails App with Mysql无法将 Ruby on Rails 应用程序与 Mysql 连接
【发布时间】：2015-09-18 23:56:05
【问题描述】：

我无法让 Ruby on Rails 应用程序连接到 Mysql 数据库

Ruby 版本：2.2.1，Mysql 版本：5.5

database.yml：

  default: &default
  adapter: mysql2
  encoding: utf8
  pool: 5
  username: root
  password: manutdfc1999
  host: 127.0.0.1
  port: 3306 
  socket: /tmp/mysql.sock

  development:
  <<: *default
  database: ruby

<<: *default
database: ruby
username: manutdfc1999
password: <%= ENV['SAOIRSE_DATABASE_PASSWORD'] %>

宝石文件：

source 'https://rubygems.org'


# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '4.2.1'
# Use mysql as the database for Active Record
gem 'mysql2'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.1.0'
# See https://github.com/rails/execjs#readme for more supported runtimes
# gem 'therubyracer', platforms: :ruby

# Use jquery as the JavaScript library
gem 'jquery-rails'
# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
gem 'turbolinks'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.0'
# bundle exec rake doc:rails generates the API under doc/api.
gem 'sdoc', '~> 0.4.0', group: :doc

# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'

# Use Unicorn as the app server
# gem 'unicorn'

# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development

group :development, :test do
  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
  gem 'byebug'

  # Access an IRB console on exception pages or by using <%= console %> in views
  gem 'web-console', '~> 2.0'

  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
  gem 'spring'
end

我的 mysql 数据库名为 ruby​​，它位于我的本地主机上 当我执行 rake db:migrate 时，我收到以下警告

davemac_1977@mysql:~/workspace/saoirse $ rake db:migrate
rake aborted!
ActiveRecord::AdapterNotSpecified: 'mysql2' database is not configured. Available: ["default", "adapter", "encoding", "pool", "username", "password", "host", "port", "socket"]
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/connection_adapters/connection_specification.rb:248:in `resolve_symbol_connection'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/connection_adapters/connection_specification.rb:231:in `resolve_string_connection'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/connection_adapters/connection_specification.rb:213:in `resolve_connection'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/connection_adapters/connection_specification.rb:139:in `resolve'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/connection_adapters/connection_specification.rb:151:in `block in resolve_all'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/connection_adapters/connection_specification.rb:150:in `each'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/connection_adapters/connection_specification.rb:150:in `resolve_all'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/connection_handling.rb:69:in `resolve'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/core.rb:46:in `configurations='
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/railtie.rb:117:in `block (2 levels) in <class:Railtie>'
/usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.2.1/lib/active_support/lazy_load_hooks.rb:38:in `instance_eval'
/usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.2.1/lib/active_support/lazy_load_hooks.rb:38:in `execute_hook'
/usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.2.1/lib/active_support/lazy_load_hooks.rb:45:in `block in run_load_hooks'
/usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.2.1/lib/active_support/lazy_load_hooks.rb:44:in `each'
/usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.2.1/lib/active_support/lazy_load_hooks.rb:44:in `run_load_hooks'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/base.rb:316:in `<module:ActiveRecord>'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/base.rb:26:in `<top (required)>'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/tasks/mysql_database_tasks.rb:8:in `<class:MySQLDatabaseTasks>'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/tasks/mysql_database_tasks.rb:3:in `<module:Tasks>'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/tasks/mysql_database_tasks.rb:2:in `<module:ActiveRecord>'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/tasks/mysql_database_tasks.rb:1:in `<top (required)>'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/tasks/database_tasks.rb:50:in `<module:DatabaseTasks>'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/tasks/database_tasks.rb:37:in `<module:Tasks>'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/tasks/database_tasks.rb:4:in `<module:ActiveRecord>'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/tasks/database_tasks.rb:3:in `<top (required)>'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/railtie.rb:41:in `block (3 levels) in <class:Railtie>'
Tasks: TOP => db:migrate => db:load_config
(See full trace by running task with --trace)

如何解决这个问题？

【问题讨论】：

  • 尝试使用 Ruby 2.0 看看是否仍然出现此错误

标签： mysql ruby-on-rails ruby


【解决方案1】：

聚会有点晚了，但这可能是你的 mysql2 版本不符合当前的轨道。

gem 'mysql2', '0.3.18'

【讨论】：

    【解决方案2】：

    使用/var/run/mysqld/mysqld.sock 而不是/tmp/mysql.sock

    default: &default
  adapter: mysql2
  encoding: utf8
  pool: 5
  username: root
  password: manutdfc1999
  host: 127.0.0.1
  port: 3306 
  socket: /var/run/mysqld/mysqld.sock

development:
  <<: *default
  database: ruby

production:
  <<: *default
  database: ruby
  username: manutdfc1999
  password: <%= ENV['SAOIRSE_DATABASE_PASSWORD'] %>

    设置执行后：

    rake db:create
rake db:migrate

    【讨论】：

    • 这也没有解决问题，我的配置文件已将套接字声明为 /tmp/mysql.sock
    【解决方案3】：

    看起来这是database.yml 文件中的缩进问题。 YML 文件应该有 2 个空格缩进。

    default: &default
  adapter: mysql2
  encoding: utf8
  pool: 5
  username: root
  password: manutdfc1999
  host: 127.0.0.1
  port: 3306 
  socket: /tmp/mysql.sock

development:
  <<: *default
  database: ruby

production:
  <<: *default
  database: ruby
  username: manutdfc1999
  password: <%= ENV['SAOIRSE_DATABASE_PASSWORD'] %>

    【讨论】：

    • 不，这并没有解决问题，仍然收到同样的警告
    • 首先，您可以使用database.yml 中的凭据连接到您的mysql 服务吗？还可以尝试删除encoding、pool、host、port、socket
    • 嗨 Ojash，当我删除凭据时，我收到以下警告。
    • 耙子中止！ ActiveRecord::AdapterNotSpecified: 'mysql2' 数据库未配置。可用：["default", "adapter", "username", "password", "development", "
    • 让我们尝试一件事，使用rails g sample -d mysql 创建一个新的rails 应用程序，然后尝试rake db:create 看看新应用程序上是否也出现错误。
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