README.md
# Nurse
**Note:** If `Nurse` constant is used in your project you can use [Koine::Di](https://github.com/mjacobus/koine-di) instead.
Nurse, for your dependency injection
Code quality
[![Build Status](https://travis-ci.org/mjacobus/nurse-rb.svg)](https://travis-ci.org/mjacobus/nurse-rb)
[![Coverage Status](https://coveralls.io/repos/github/mjacobus/nurse-rb/badge.svg?branch=master)](https://coveralls.io/github/mjacobus/nurse-rb?branch=master)
[![Code Climate](https://codeclimate.com/github/mjacobus/nurse-rb/badges/gpa.svg)](https://codeclimate.com/github/mjacobus/nurse-rb)
Package information
[![Gem Version](https://badge.fury.io/rb/nurse-rb.svg)](https://badge.fury.io/rb/nurse-rb)
## Installation
Add this line to your application's Gemfile:
```ruby
gem 'nurse-rb'
```
And then execute:
$ bundle
Or install it yourself as:
$ gem install nurse-rb
## Usage
### Defining dependencies
```ruby
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.
```ruby
dependency_manager = Nurse.instance
```
### Fetching dependencies
```ruby
class UsersController < SomeBaseController
def index
@users = repository.find_all
end
private
def repository
dependency_manager.get(:user_repository)
end
end
```
### Using factories
```ruby
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)
```
## 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](https://rubygems.org).
## Contributing
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](contributor-covenant.org) code of conduct.
## License
The gem is available as open source under the terms of the [MIT License](http://opensource.org/licenses/MIT).