ActiveRecord :: ConnectionNotE建立了Ruby on Rails

我在Ruby on Rails上使用了mysql2，接下来是Kevin Skoglund的Ruby on Rails 4基础培训，以及我在早期章节中告诉我通过键入'导轨服务器“并在我的浏览器上打开”localhost：3000“。ActiveRecord :: ConnectionNotE建立了Ruby on Rails

问题是这样的： Connection not Established

所以我不能访问我的项目，不能与教程继续前进。

另外，我注意到我和教程的终端有些不同。在我的终端中，在启动WEBrick之前，它会显示： /home/jmmaglinao16/.rvm/gems/ruby-2.3.0/gems/activesupport-4.0.0/lib/active_support/values/time_zone.rb:282：警告：圆形参数参考 - 现在

我不确定它是否与问题有任何关联，但这就是我目前为止的情况。请帮助我们。谢谢。

的Gemfile：

source 'rubygems.org' 

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails' 
gem 'rails', '4.0.0' 

# Use mysql as the database for Active Record 
gem 'mysql2' 

# Use SCSS for stylesheets 
#gem 'sass-rails', '~> 4.0.0' 

# Use Uglifier as compressor for JavaScript assets 
#gem 'uglifier', '>= 1.3.0' 

# Use CoffeeScript for .js.coffee assets and views 
#gem 'coffee-rails', '~> 4.0.0' 

# See 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: 
#gem 'turbolinks' 

# Build JSON APIs with ease. Read more: 
#gem 'jbuilder', '~> 1.2' 

group :doc do 
    # bundle exec rake doc:rails generates the API under doc/api. 
    gem 'sdoc', require: false 
end 

# Use ActiveModel has_secure_password 
# gem 'bcrypt-ruby', '~> 3.0.0' 

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

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

# Use debugger 
# gem 'debugger', group: [:development, :test]

的database.yml：

# MySQL. Versions 4.1 and 5.0 are recommended. 
# 
# Install the MYSQL driver 
# gem install mysql2 
# 
# Ensure the MySQL gem is defined in your Gemfile 
# gem 'mysql2' 
# 
# And be sure to use new-style password hashing: 
# 
development: 
    adapter: mysql2 
    encoding: utf8 
    database: #simple_cms_development 
    pool: 5 
    username: root 
    password: mypass 
    socket: /var/run/mysqld/mysqld.sock 

# Warning: The database defined as "test" will be erased and 
# re-generated from your development database when you run "rake". 
# Do not set this db to the same as development or production. 
test: 
    adapter: mysql2 
    encoding: utf8 
    database: simple_cms_test 
    pool: 5 
    username: root 
    password: mypass 
    socket: /var/run/mysqld/mysqld.sock 

production: 
    adapter: mysql2 
    encoding: utf8 
    database: simple_cms_production 
    pool: 5 
    username: root 
    password: mypass 
    socket: /var/run/mysqld/mysqld.sock

来源

2016-06-11 JM Maglinao

请张贴你的宝石文件和你的'appname/config/database.yml'文件。 – MarsAtomic

这不是错误的原因，但是您使用的ruby版本与您正在使用的rails版本不兼容。 –

你开始使用mysql吗？ – uzaif

尝试把 '＃' 在喜欢这里的行的开头：
#database：simple_cms_development

来源

2016-08-06 15:08:36 Xenonius

ActiveRecord :: ConnectionNotE建立了Ruby on Rails

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