Rails 4：after_update回调导致无限循环 [英] Rails 4: after_update callback leads to endless loop

问题描述

我在我的用户模型中使用after_update回调。

Model User.rb

$ b b

  after_update：check_phone 
 
 check_phone 
 phone_validation如果phone_changed？ 
 end 
 
 def phone_validation 
 code = Array.new（8）{rand（36）.to_s（36）}。join 
 self.phone_verification_code = code 
 self.save 
 end 
  

然而，这导致了无限循环。问题是，在phone_validation方法中 self.save 后再次调用回调。 phone_changed？显然仍然会返回 true 。如何更改此行为？

解决方案

User.rb

  attr_accessor：phone_checked 
 
 after_update：check_phone， unless => phone_checked
 
 check_phone 
 phone_validation如果phone_changed？ 
 end 
 
 def phone_validation 
 code = Array.new（8）{rand（36）.to_s（36）}。join 
 self.phone_verification_code = code 
 self.phone_checked = true＃update flag 
 self.save 
 end 
  

或

谨慎使用： skip callbacks

  def phone_validation 
 code = Array.new（8）{rand（36）.to_s（36）}。join 
 self.update_column（：phone_verification_code => code）
 end 
  

I use the after_update callback in my User model.

Model User.rb

after_update :check_phone

check_phone
  phone_validation if phone_changed?
end

def phone_validation
  code = Array.new(8){rand(36).to_s(36)}.join
  self.phone_verification_code = code
  self.save
end

However, this leads to an endless loop. The problem is that the callback is called again after self.save in the phone_validation method. phone_changed? apparently still returns true. How can I change this behaviour?

解决方案

Try this:

User.rb

attr_accessor  :phone_checked

after_update :check_phone, :unless => "phone_checked"

check_phone
  phone_validation if phone_changed?
end

def phone_validation
  code = Array.new(8){rand(36).to_s(36)}.join
  self.phone_verification_code = code
  self.phone_checked = true  # update flag
  self.save
end

OR

use with caution: skip callbacks

def phone_validation
 code = Array.new(8){rand(36).to_s(36)}.join
 self.update_column(:phone_verification_code => code)
end

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