如何在 rails STI 派生模型中禁用验证和回调? [英] How can I disable a validation and callbacks in a rails STI derived model?

问题描述

给定模型

class BaseModel < ActiveRecord::Base
  validates_presence_of :parent_id
  before_save :frobnicate_widgets
end

和一个派生模型(底层数据库表有一个 type 字段 - 这是简单的 rails STI)

and a derived model (the underlying database table has a type field - this is simple rails STI)

class DerivedModel < BaseModel
end

DerivedModel 将以良好的面向对象方式继承 BaseModel 的所有行为，包括 validates_presence_of :parent_id.我想关闭 DerivedModel 的验证，并防止回调方法触发，最好不要修改或以其他方式破坏 BaseModel

DerivedModel will in good OO fashion inherit all the behaviour from BaseModel, including the validates_presence_of :parent_id. I would like to turn the validation off for DerivedModel, and prevent the callback methods from firing, preferably without modifying or otherwise breaking BaseModel

最简单、最可靠的方法是什么?

What's the easiest and most robust way to do this?

推荐答案

我喜欢使用以下模式:

class Parent < ActiveRecord::Base
  validate_uniqueness_of :column_name, :if => :validate_uniqueness_of_column_name?
  def validate_uniqueness_of_column_name?
    true
  end
end

class Child < Parent
  def validate_uniqueness_of_column_name?
    false
  end
end

如果 rails 提供一个 skip_validation 方法来解决这个问题就好了，但这种模式可以很好地处理复杂的交互.

It would be nice if rails provided a skip_validation method to get around this, but this pattern works and handles complex interactions well.

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