Question

I have created a simple application using

rails new simple_cms -d mysql2

After running the WEBRick using command

   rails s

I created a controller and view

rails generate controller demo index

When I am pointing my browser to

  localhost:3000/demo/index

I am getting error

ActiveRecord::ConnectionNotEstablished
Rails.root: /Users/username/Sites/simple_cms

here is my gemfile

gem 'rails', '3.0.1'
gem 'mysql2', '0.3.11'

Answer 1

You also need to create a MySQL database and configure the connection details in your config/database.yml file.

If the username and password in your database.yml file identify a user who has a global CREATE permission on your development database, then you can use the rake task

rake db:create

to get Rails to set up the database.