Methods

Service methods are called only with make method.

Examples

Minimum

make :something

def something
  # ...
end

Several methods

make :assign_api_model
make :perform_api_request
make :process_result

def assign_api_model
  self.api_model = APIModel.new
end

def perform_api_request
  self.response = APIClient.resource.create(api_model)
end

def process_result
  ARModel.create!(response)
end

Options

Option if

Before calling the method, the condition described in if will be checked.

make :something,
     if: ->(**) { Settings.something.enabled }

def something
  # ...
end

Option unless

The opposite of the if option.

make :something,
     unless: ->(**) { Settings.something.disabled }

def something
  # ...
end

Option position

All methods have a position. If a method needs to be called at a different time than it was added via make, then the position option can be used. Can be useful at service inheritance.

class SomeApiService::Base < ApplicationService::Base
  make :api_request!,
       position: 2

  # ...
end

class SomeApiService::Posts::Create < SomeApiService::Base
  input :post_name, type: String

  # ...
  
  make :validate!,
       position: 1

  private

  def validate!
    # ...
  end

  # ...
end

Group of multiple methods

You can use the stage method to group multiple methods into one execution group.

info

Usage of the position option for make will sort only in stage.

stage do
  make :create_user!
  make :create_blog_for_user!
  make :create_post_for_user_blog!
end

Option only_if

Перед вызовом методов внутри stage будет проверено условие, описанное в only_if.

stage do
  only_if ->(context:) { Settings.features.preview.enabled }
  
  make :create_user!
  make :create_blog_for_user!
  make :create_post_for_user_blog!
end

Option wrap_in

Group of methods in stage can be wrapped in something. For example, it could be ActiveRecord::Base.transaction from Rails.

stage do
  wrap_in ->(methods:) { ActiveRecord::Base.transaction { methods.call } }
  
  make :create_user!
  make :create_blog_for_user!
  make :create_post_for_user_blog!
end

Option rollback

If an exception occurs in one of the methods in the group or in wrap_in, this can be handled using the rollback method.

stage do
  wrap_in ->(methods:) { ActiveRecord::Base.transaction { methods.call } }
  rollback :clear_data_and_fail!
  
  make :create_user!
  make :create_blog_for_user!
  make :create_post_for_user_blog!
end

# ...

def clear_data_and_fail!(e)
  # ...

  fail!(message: "Failed to create data: #{e.message}")
end

Method shortcuts

Add frequently used words that are used as prefixes in method names through the method_shortcuts configuration. It won't make the names of methods shorter, but that will shorten the lines using the make method and improve the readability of the service code, making it more expressive.

configuration do
  method_shortcuts %i[assign perform]
end

assign :api_model
perform :api_request
make :process_result

def assign_api_model
  self.api_model = APIModel.new
end

def perform_api_request
  self.response = APIClient.resource.create(api_model)
end

def process_result
  ARModel.create!(response)
end