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kyrylo/service.rb

Last active August 7, 2024 06:11
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How to define service objects in Rails: the simple way
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service.rb
# frozen_string_literal: true
class ApplicationService
def self.call(...)
new(...).call
end
def initialize(...)
end
end
class CurrentIpService < ApplicationService
def initialize(request)
super
@request = request
end
def call
ip_headers = [
@request.env["HTTP_CF_CONNECTING_IP"],
@request.env["HTTP_CLIENT_IP"],
@request.env["HTTP_X_FORWARDED_FOR"],
@request.env["HTTP_X_FORWARDED"],
@request.env["HTTP_FORWARDED_FOR"],
@request.env["HTTP_FORWARDED"],
@request.env["REMOTE_ADDR"]
]
(ip_headers.find(&:present?) || "127.0.0.1").split(",").first
end
end
CurrentIpService.call(request)
@kyrylo
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kyrylo commented Aug 5, 2024

I use service objects in all of my Rails projects.

👷‍♂️ This is how I engineer them:

  1. Define the ApplicationService class with the call class method that does nothing but accepts any params and initializes a service, then calls the call instance method immediately

  2. Define the initialize instance method that does nothing but accepts any params

  3. Define a service that inherits from ApplicationService and defines the call method. If a service requires params, I define the initialize method, call super, then use the params. If you don't need params, then you don't need to define initialize at all

  4. Implement the call method.

That's all!

https://x.com/kyrylosilin/status/1820473128365019139

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