Dmat00 Dmat00 - 1 year ago 185
Ruby Question

Ruby - ActiveRecord::ConnectionNotEstablished

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.

In this chapter, I entered the following command into the prompt:

rails generate controller Pages home contact
and everything worked fine.

Then the book directs me to
. When I point my browser there, I receive the following error.


Rails.root: /home/ralph/railsprojects/sample_app

Application Trace | Framework Trace | Full Trace

The routes and controller erb don't appear to have any errors. Is this a database related error? Any ideas?



This is the code in my database.yml file.

# SQLite version 3.x
# gem install sqlite3
# Ensure the SQLite 3 gem is defined in your Gemfile
# gem 'sqlite3'
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.
adapter: sqlite3
database: db/test.sqlite3
pool: 5
timeout: 5000

adapter: sqlite3
database: db/production.sqlite3
pool: 5
timeout: 5000

Here is the information from the Framework Trace:

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'

Answer Source

I had the same problem, I started the sample-app from scratch and used this gemfile:

source ''

gem 'rails', '3.1.1'

gem 'sqlite3'

group :development do
  gem 'rspec-rails', '2.6.1'

group :test do
  gem 'rspec-rails', '2.6.1'
  gem 'webrat', '0.7.1'

group :assets do
  gem 'sass-rails',   '~> 3.1.4'
  gem 'coffee-rails', '~> 3.1.1'
  gem 'uglifier', '>= 1.0.3'

gem 'jquery-rails'

This solved the problem for me :)

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