Koine::Di

Koine::Di, for your dependency injection A fork of Nurse under a safer namespace.

Code quality

Package information

Installation

Add this line to your application's Gemfile:

gem 'koine-di'

And then execute:

$ bundle

Or install it yourself as:

$ gem install koine-di

Usage

Defining dependencies

dependency_manager = Koine::Di::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 = Koine::Di.instance

Fetching dependencies

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

  private

  def repository
    dependency_manager.get(:user_repository)
  end
end

Using factories

class DatabaseConnectionFactory < Koine::Di::ServiceFactory
  share true
  key :db_connection

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

class UserRepositoryFactory < Koine::Di::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)

Development

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.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/mjacobus/koine-di. 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.

License

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