Using Bundler in a Rake Task

If you want to use Bundler in a rake task to automate something like bundle install, you can't simply call bundle install in a system call. Fortunately, Bundler provides a method called Bundler.with_clean_env. Using that, you can do something like

 require 'bundler'  
 Bundler.with_clean_env  
  system 'bundle install'  
 end  

to run your task.

Rake Database Tasks Outside Rails

My first content post is, ironically, not directly about Rails. It is about using a very common Rails feature - rake database tasks - in a Ruby project that utilizes ActiveRecord but not Rails.

By default, tasks like rake db:migrate are available in Rails but not in a Ruby project that includes ActiveRecord. Fortunately, with a couple of lines added to your Rakefile this issue can be fixed.

 // Rakefile
 DatabaseTasks.env = ENV['YOUR_ENV_VAR'] || 'development'  
 DatabaseTasks.db_dir = 'db'  
 DatabaseTasks.database_configuration = YAML.load_file('config/database.yml')  
 DatabaseTasks.migrations_paths = "#{DatabaseTasks.db_dir}/migrate"  
 task :environment do  
  ActiveRecord::Base.configurations = DatabaseTasks.database_configuration  
  ActiveRecord::Base.establish_connection DatabaseTasks.env.to_sym  
 end  
 load 'active_record/railties/databases.rake'  

And voila. Now, you can use create, migrate, and all of the other rake db tasks you're used to in a Rails project.