Blatt

Just a Dependency Injection Container.

Why?

This gem allow us to write down the dependency graph in an external file, like JSON, TOML. It won't parse those files tho because we don't want to force down any format on you.

Usage

dependencies.json

  {
    "photo_service": {
      "object": "Example::Services::Photo",
      "dependencies": ["photos_repository", "some string", 15]
    },
    "photos_repository": {
      "object": "Example::Repositories::Photos",
      "dependencies": []
    }
  }

app.rb

  require "json"
  require "blatt"

  Blatt::Fetcher.new(JSON.parse("dependencies.json", symbolize_names: true))

  photo_service = Blatt.get("photo_service")

  # Let's suppose every dependency is public :)

  photo_service.the_injected_repository # => "Example::Repositories::Photos"
  photo_service.the_injected_string     # => "String:some string"
  photo_service.the_injected_integer    # => "Integer:15"

  # It always returns the same instance

  Blatt.get("photo_service") == photo_service # => True