model.create 上未调用 before_create

Question

我有这个代码：

class Project < ActiveRecord::Base
    acts_as_paranoid

    belongs_to :user
    belongs_to :organization
    accepts_nested_attributes_for :organization


    attr_accessible :name, :permalink, :organization_id, :user_id

    validates_length_of :name, :minimum => 4
    validates_presence_of   :permalink
    validates_uniqueness_of :permalink, :case_sensitive => false, :scope => :deleted_at

     
    validates_presence_of :user        
    validates_presence_of :organization

    before_create :generate_permalink

    protected

    def generate_permalink
      binding.pry
      self.permalink = "123456789"
    end    
    
end

当我调用 ProjectsController#create 时

p = Project.new
p.name = "abcdef"
p.save

应用程序不会停止在generate_permalink中的binding.pry上，并且该项目无效且未保存，因为permalink == nil. 为什么没有调用generate_permalink方法？

Answer 1

您必须premalink在before_validation回调中设置。 before_create验证后调用回调。此处验证失败，因此您的before_create回调永远不会调用。

在此处检查回调序列 http://api.rubyonrails.org/classes/ActiveRecord/Callbacks.html