Nurse

Note: If Nurse constant is used in your project you can use Koine::Di instead.

Nurse, for your dependency injection

Code quality

Package information

Add this line to your application's Gemfile:

gem 'nurse-rb'

And then execute:

$ bundle

Or install it yourself as:

$ gem install nurse-rb

dependency_manager = Nurse::DependencyContainer.new

dependency_manager.share(:connection) do |dependency_manager|
  MyConnection.new("mysql://root@localhost/my_db")
end

dependency_manager.share(:user_repository) do |dependency_manager|
  connection = dependency_manager.get(:connection)
  UserRepository.new(connection)
end

Also, you can use the singleton instance. Use singleton if you do not have control over how classes, such as controllers, are created.

dependency_manager = Nurse.instance

class UsersController < SomeBaseController
  def index
    @users = repository.find_all
  end

  private

  def repository
    dependency_manager.get(:user_repository)
  end
end

class DatabaseConnectionFactory < Nurse::ServiceFactory
  share true
  key :db_connection

  def create_service(dependencies)
    DatabaseConnection.new(dependencies.get(:db_config))
  end
end

class UserRepositoryFactory < Nurse::ServiceFactory
  key :user_repository

  def create_service(dependencies)
    UserRepository.new(dependencies.get(:db_connection))
  end
end

dependency_manager.add_factory(DatabaseConnectionFactory.new)
dependency_manager.add_factory(UserRepositoryFactory.new)

After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/mjacobus/nurse-rb. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

The gem is available as open source under the terms of the MIT License.