Params and Options
Use param to define plain argument:
require 'dry-initializer'
class User
extend Dry::Initializer
param :name
param :email
end
user = User.new 'Andrew', 'andrew@email.com'
user.name # => 'Andrew'
user.email # => 'andrew@email.com'
Use option to define named (hash) argument:
require 'dry-initializer'
class User
extend Dry::Initializer
option :name
option :email
end
user = User.new email: 'andrew@email.com', name: 'Andrew'
user.name # => 'Andrew'
user.email # => 'andrew@email.com'
Options can be renamed using :as key:
require 'dry-initializer'
class User
extend Dry::Initializer
option :name, as: :username
end
user = User.new name: "Joe"
user.username # => "Joe"
user.instance_variable_get :@username # => "Joe"
user.instance_variable_get :@name # => nil
user.respond_to? :name # => false
You can also define several ways of initializing the same argument via different options:
require 'dry-initializer'
class User
extend Dry::Initializer
option :phone
option :telephone, as: :phone
option :name, optional: true
end
User.new(phone: '1234567890').phone # => '1234567890'
User.new(telephone: '1234567890').phone # => '1234567890'