Using Rails Migration on different database than standard “production” or “development”

Question

I have a rails project running that defines the standard production:, :development and :test DB-connections in config/database.yml

In addition I have a quiz_developm

Answer 1

In addition to running a migration in a different environment, I also want the schemas in separate files. You can do this from the command line:

RAILS_ENV=quiz_development SCHEMA=db/schema_quiz_development.rb rake db:migrate

But I like the custom rake task approach so I can type this instead:

rake db:with[quiz_development, db:migrate]

Here's the rake task:

namespace :db do
  desc "Run :task against :database"
  task :with, [:database,:task] => [:environment] do |t, args|
    puts "Applying #{args.task} to #{args.database}"
    ENV['SCHEMA'] ||= "#{Rails.root}/db/schema_#{args.database}.rb"
    begin
      oldRailsEnv = Rails.env
      Rails.env = args.database
      ActiveRecord::Base.establish_connection(args.database)
      Rake::Task[args.task].invoke
    ensure
      Rails.env = oldRailsEnv
    end
  end
end