我想知道创建ActiveRecord对象时调用回调和验证的顺序是什么.
假设我有一些自定义验证&；回调如下所示:
validates :reference_code, :if => :reference_code, :on => :create
before_create :assign_reference
哪个先跑？需要首先进行回调，否则验证可能会失败.
我想知道创建ActiveRecord对象时调用回调和验证的顺序是什么.
假设我有一些自定义验证&；回调如下所示:
validates :reference_code, :if => :reference_code, :on => :create
before_create :assign_reference
哪个先跑？需要首先进行回调，否则验证可能会失败.
最新版本的Rails列表可以在ActiveRecord::Callbacks documentation中找到.轨道4、3和；下面是两个例子.
该列表的最新版本可以在轨道4 Guides中找到.
before_validationafter_validationbefore_savearound_savebefore_createaround_createafter_createafter_saveafter_commit/after_rollbackbefore_validationafter_validationbefore_savearound_savebefore_updatearound_updateafter_updateafter_saveafter_commit/after_rollbackbefore_destroyaround_destroyafter_destroyafter_commit/after_rollback该列表的最新版本可以在轨道3 Guides中找到.
before_validationafter_validationbefore_savearound_savebefore_createaround_createafter_createafter_savebefore_validationafter_validationbefore_savearound_savebefore_updatearound_updateafter_updateafter_savebefore_destroyaround_destroyafter_destroy该列表的最新版本可在轨道2.3 Guides页中找到
before_validationbefore_validation_on_createafter_validationafter_validation_on_createbefore_savebefore_createafter_createafter_savebefore_validationbefore_validation_on_updateafter_validationafter_validation_on_updatebefore_savebefore_updateafter_updateafter_savebefore_destroyafter_destroy因为需要首先验证reference_code，所以可以在after_validation回调中调用assign_reference方法，或者在我上面提供的列表中，在它之后出现的任何回调中调用assign_reference方法.