Rails 4:如何取消对“before_save"的保存打回来? [英] Rails 4: How to cancel save on a "before_save" callback?

问题描述

我有复杂的模型/表格.我不想重复记录，所以我想合并具有相似属性的记录.如何使用 before_save 回调取消保存"?这就是我的想法:

I have complicated models / forms. I don't want repeated records, so I want to merge records that have similar attributes. How would I cancel "save" using a before_save callback? This is what I'm thinking:

class ProductsColor < ActiveRecord::Base


  before_save :check_for_similar_record

  def check_for_similar_record
    if ProductsColor.exist?(color_id: self.color_id, product_id: self.product_id)
      # merge values with existing ProductsColor and stop self from saving
    end
  end

end

推荐答案

为了防止记录被保存，你应该简单地返回false:

To prevent record from being saved, you should simply return false:

def check_for_similar_record
  if ProductsColor.exists?(color_id: self.color_id, product_id: self.product_id)
    # merge values
    false
  else
    true
  end
end

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