Module: Flipper

Defined in:
lib/flipper.rb

Overview

Include this module in your Rails controller to change database schema on each HTTP request:

class ApplicationController < ActionController::Base
  include Flipper

  before_filter :switch_database  # if RAILS_ENV == "selenium"

  ...
end

Instance Method Summary collapse

Instance Method Details

#switch_database ⇒ Object

Switch current database based on flipper_db_config HTTP parameter, if any, and store database configuration in session.

If there is no flipper_db_config parameter, switch to the database configuration stored in session.

If anything goes wrong while switching database, attempts to rollback to the previous database configuration before raising an exception.



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# File 'lib/flipper.rb', line 22

def switch_database
  database_configuration = params[:flipper_db_config] || session[:flipper_db_config]
  return unless database_configuration
  
  prior_configuration = ActiveRecord::Base.connection.instance_variable_get(:@config)
  ActiveRecord::Base.clear_active_connections!
  begin
    ActiveRecord::Base.establish_connection database_configuration
    session[:flipper_db_config] = database_configuration
  rescue => ex
    ActiveRecord::Base.establish_connection prior_configuration
    raise
  end
end