How should I use after_create with a condition in the model

问题

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

after_create :send_welcome_email

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"

for example?

回答1:

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

Documentation

来源：https://stackoverflow.com/questions/7314493/how-should-i-use-after-create-with-a-condition-in-the-model