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Input attributes ​

Add all expected attributes via the input method. Unexpected arguments (not defined as input attributes) cause an error.

Usage ​

Access input attributes via the inputs method.

ruby
class Users::Create < ApplicationService::Base
  input :first_name, type: String
  input :middle_name, type: String
  input :last_name, type: String

  internal :full_name, type: String

  output :user, type: User

  make :assign_full_name
  make :create!

  def assign_full_name
    internals.full_name = [
      inputs.first_name,
      inputs.middle_name,
      inputs.last_name
    ].join(" ")
  end

  def create!
    outputs.user = User.create!(full_name: internals.full_name)
  end
end

Options ​

See using options for details.

Helpers ​

Servactory provides built-in helpers and supports custom helpers. Helpers are shorthand that expand into specific options.

Helper optional ​

Equivalent to required: false.

ruby
class Users::Create < ApplicationService::Base
  input :first_name,
        type: String

  input :middle_name,
        :optional,
        type: String

  input :last_name,
        type: String

  # ...
end

Custom ​

Add custom helpers via input_option_helpers in configuration. Helpers can be based on existing options.

Configuration example

Example with must ​

ruby
class Payments::Create < ApplicationService::Base
  input :invoice_numbers,
        :must_be_6_characters,
        type: Array,
        consists_of: String

  # ...
end

Example with prepare ​

ruby
class Payments::Create < ApplicationService::Base
  input :amount_cents,
        :to_money,
        as: :amount,
        type: Integer

  # ...
end

Methods ​

Method only ​

Filter inputs with the only method. Returns a Hash with specified attributes.

ruby
outputs.full_name =
  inputs.only(:first_name, :middle_name, :last_name)
    .values
    .compact
    .join(" ")

Method except ​

Filter inputs with the except method. Returns a Hash without specified attributes.

ruby
outputs.full_name =
  inputs.except(:gender)
    .values
    .compact
    .join(" ")

Predicate methods ​

Access any input attribute as a predicate method.

ruby
input :first_name, type: String

# ...

def something
  return unless inputs.user? # instead of `inputs.user.present?`
  
  # ...
end