title: Ruby - ActiveRecord::ConnectionNotEstablished
body: <p>I am rather new to Ruby and have been following along with the book "Ruby On Rails 3 Tutorial - Learn Ruby by Example - by Michael Hartl". I am currently in Chapter 3 which discusses static pages. </p>
  
  <p>In this chapter, I entered the following command into the prompt: <code>rails generate controller Pages home contact</code> and everything worked fine. </p>
  
  <p>Then the book directs me to <code>http://localhost:3000/pages/home</code>. When I point my browser there, I receive the following error.</p>
  
  <pre>
  ActiveRecord::ConnectionNotEstablished
  
  ActiveRecord::ConnectionNotEstablished
  Rails.root: /home/ralph/railsprojects/sample_app
  
  Application Trace | Framework Trace | Full Trace
  </pre>
  
  <p>The routes and controller erb don't appear to have any errors. Is this a database related error? Any ideas?</p>
  
  <p>Thanks,
  DMAT</p>
  
  <p>Update:</p>
  
  <p>This is the code in my database.yml file.</p>
  
  <pre><code># SQLite version 3.x
  #   gem install sqlite3
  #
  #   Ensure the SQLite 3 gem is defined in your Gemfile
  #   gem 'sqlite3'
  development:
    adapter: sqlite3
    database: db/development.sqlite3
    pool: 5
    timeout: 5000
  
  # 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: sqlite3
    database: db/test.sqlite3
    pool: 5
    timeout: 5000
  
  production:
    adapter: sqlite3
    database: db/production.sqlite3
    pool: 5
    timeout: 5000
  </code></pre>
  
  <p>Here is the information from the Framework Trace:</p>
  
  <pre><code>  activerecord (3.1.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:409:in `retrieve_connection'
    activerecord (3.1.1) lib/active_record/connection_adapters/abstract/connection_specification.rb:107:in `retrieve_connection'
    activerecord (3.1.1)lib/active_record/connection_adapters/abstract/connection_specification.rb:89:in `connection'
    activerecord (3.1.1) lib/active_record/query_cache.rb:65:in `call'
    activerecord (3.1.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:477:in `call'
    actionpack (3.1.1) lib/action_dispatch/middleware/callbacks.rb:29:in `call'
    activesupport (3.1.1) lib/active_support/callbacks.rb:392:in `_run_call_callbacks'
    activesupport (3.1.1) lib/active_support/callbacks.rb:81:in `send'
    activesupport (3.1.1) lib/active_support/callbacks.rb:81:in `run_callbacks'
    actionpack (3.1.1) lib/action_dispatch/middleware/callbacks.rb:28:in `call'
    actionpack (3.1.1) lib/action_dispatch/middleware/reloader.rb:68:in `call'
    rack (1.3.5) lib/rack/sendfile.rb:101:in `call'
    actionpack (3.1.1) lib/action_dispatch/middleware/remote_ip.rb:48:in `call'
    actionpack (3.1.1) lib/action_dispatch/middleware/show_exceptions.rb:47:in `call'
    railties (3.1.1) lib/rails/rack/logger.rb:13:in `call'
    rack (1.3.5) lib/rack/methodoverride.rb:24:in `call'
    rack (1.3.5) lib/rack/runtime.rb:17:in `call'
    activesupport (3.1.1) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
    rack (1.3.5) lib/rack/lock.rb:15:in `call'
    actionpack (3.1.1) lib/action_dispatch/middleware/static.rb:53:in `call'
    railties (3.1.1) lib/rails/engine.rb:456:in `call'
    railties (3.1.1) lib/rails/rack/content_length.rb:16:in `call'
    railties (3.1.1) lib/rails/rack/log_tailer.rb:14:in `call'
    rack (1.3.5) lib/rack/handler/webrick.rb:59:in `service'
    /usr/lib/ruby/1.8/webrick/httpserver.rb:104:in `service'
    /usr/lib/ruby/1.8/webrick/httpserver.rb:65:in `run'
    /usr/lib/ruby/1.8/webrick/server.rb:173:in `start_thread'
    /usr/lib/ruby/1.8/webrick/server.rb:162:in `start'
    /usr/lib/ruby/1.8/webrick/server.rb:162:in `start_thread'
    /usr/lib/ruby/1.8/webrick/server.rb:95:in `start'
    /usr/lib/ruby/1.8/webrick/server.rb:92:in `each'
    /usr/lib/ruby/1.8/webrick/server.rb:92:in `start'
    /usr/lib/ruby/1.8/webrick/server.rb:23:in `start'
    /usr/lib/ruby/1.8/webrick/server.rb:82:in `start'
    rack (1.3.5) lib/rack/handler/webrick.rb:13:in `run'
    rack (1.3.5) lib/rack/server.rb:265:in `start'
    railties (3.1.1) lib/rails/commands/server.rb:70:in `start'
    railties (3.1.1) lib/rails/commands.rb:54
    railties (3.1.1) lib/rails/commands.rb:49:in `tap'
    railties (3.1.1) lib/rails/commands.rb:49
    script/rails:6:in `require'
    script/rails:6
  </code></pre>