Run Rails App without DB Connection

One of my co rails developer asked me how to disable DB connection when the rails application loads. Before you understand, ask yourself why you want to disable a database when rails app load.  Some of the application might just deal with other web services – such as twitter apps.  They might never need the database.  Let’s look at how to disable the database when the rails application load. 

Step 1:

#config/environment.rb

require File.join(File.dirname(__FILE__), 'boot')

Step 2:

class MyInitializer < Rails::Initializer

  def initialize_database

    if configuration.frameworks.include?(:active_record)

      ActiveRecord::Base.configurations = configuration.database_configuration

      ## uncomment the next line to automatically establish the connection

      # ActiveRecord::Base.establish_connection

    end

  end

end

Step 3:

#now, instead of `Rails::Initializer.run ...` do this 

MyInitializer.run do |config|

  # ...

end

Easy huh!   Go ahead and  run your rails application without Database Connection.