如何在模型中使用after_create和条件

问题描述

我有一个在创建对象后调用的方法

I have a method that is called after the creation of an object

after_create :send_welcome_email

是否可以将其限制为条件，例如对象属性的值

Is there a way to limit this to a condition, such as the value of an attribute of an object

after_create :send_welcome_email unless self.role == "Celebrant"

例如?

推荐答案

有三种方法可以做到这一点:Symbol，String或Proc.

There are three ways to do this: Symbol, String, or Proc.

class User < ActiveRecord::Base

  after_create :send_welcome_email, unless: :is_celebrant?
  after_create :send_welcome_email, unless: "is_celebrant?"
  after_create :send_welcome_email, unless: Proc.new { self.role == "Celebrant" }

end

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