Container Version
Instead of extending a class with the Dry::Initializer, you can include a container with the initializer method only. This method should be preferred when you don't need subclassing.
require 'dry-initializer'
class User
# notice `-> do .. end` syntax
include Dry::Initializer.define -> do
param :name, proc(&:to_s)
param :role, default: proc { 'customer' }
option :admin, default: proc { false }
end
end
If you still need the DSL (param and option) to be inherited, use the direct extension:
require 'dry-initializer'
class BaseService
extend Dry::Initializer
alias_method :dependency, :param
end
class ShowUser < BaseService
dependency :user
def call
puts user&.name
end
end