/
mixin.rb
57 lines (55 loc) · 1.34 KB
/
mixin.rb
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# frozen_string_literal: true
module Dry
module Monads
module Do
# Do notation as a mixin.
# You can use it in any place in your code, see examples.
#
# @example class-level mixin
#
# class CreateUser
# extend Dry::Monads::Do::Mixin
# extend Dry::Monads[:result]
#
# def self.run(params)
# self.call do
# values = bind Validator.validate(params)
# user = bind UserRepository.create(values)
#
# Success(user)
# end
# end
# end
#
# @example using methods defined on Do
#
# create_user = proc do |params|
# Do.() do
# values = bind validate(params)
# user = bind user_repo.create(values)
#
# Success(user)
# end
# end
#
# @api public
module Mixin
# @api public
def call
yield
rescue Halt => e
e.result
end
# @api public
def bind(monads)
monads = Do.coerce_to_monad(Array(monads))
unwrapped = monads.map do |result|
monad = result.to_monad
monad.or { Do.halt(monad) }.value!
end
monads.size == 1 ? unwrapped[0] : unwrapped
end
end
end
end
end