This refactoring pattern is very simple but I found it very useful in every app I was working on. You can use it wherever class or method has to much code. I used to stick to these rules when creating services:
servicesuffix in every service class name
- respect single responsibility principle but it’s more a general rule than something specific to the service pattern
Let’s build some sample service class to demonstrate idea behind it:
module Users class EmailDomainService def initialize(user) @user = user end def email_domain user.email.split("@").last if user.email.present? end private attr_reader :user end end
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It’s a very simple and small but very useful class. You shouldn’t have many lines of code inside your services. They should do only small things, serve only one thing at once.
You can use this pattern when you will be refactoring large class by moving small portions of code to separated services.