ActiveRecord :: ConnectionNotFounded Ruby on Rails

Question

我在Kevin on Skoglund的Ruby on Rails 4基本培訓之后，在Ruby on Rails上使用mysql2，並且在早期的章節中，它告訴我通過鍵入“ rails server”並打開“ localhost：3000”來訪問項目。在我的瀏覽器上。

問題是這樣的： 未建立連接

因此，我無法訪問我的項目，也無法繼續學習教程。

另外，我注意到本人和本教程的終端之間有些不同。 在我的終端中，在啟動WEBrick之前，它顯示以下內容：/home/jmmaglinao16/.rvm/gems/ruby-2.3.0/gems/activesupport-4.0.0/lib/active_support/values/time_zone.rb:282：警告：循環參數參考-現在

我不確定它是否與問題有關，但這就是我到目前為止的問題。 請幫助我。 謝謝。

寶石文件：

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]

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

Answer 1

嘗試將'＃'放在行的開頭，如下所示：
＃數據庫：simple_cms_development