如何禁用轨道STI导出模型中的验证和回调？ [英] How can I disable a validation and callbacks in a rails STI derived model?

问题描述

给定一个模型

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类型字段 - 这是简单的轨道STI）

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

class DerivedModel < BaseModel
end

DerivedModel 在良好的OO时尚继承从 BaseModel ，包括 validates_presence_of：parent_id 的所有行为。我想为 DerivedModel 关闭验证，并防止回调方法触发，最好不要修改或破坏 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

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

提供了一个skip_validation方法来解决这个问题，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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