如何使 mongo 映射器需要一个 own_to ？

发布于 2024-12-22 21:20:19 字数 387 浏览 2 评论 0原文

我正在使用 Mongo Mapper，我试图弄清楚如何使文档成为必需的。例如，我想做这样的事情：

class Question
  include MongoMapper::Document

  many :answers
end

class Answer
  include MongoMapper::Document

  belongs_to :question, :required => true
end

但是当我这样做时，并不强制答案有一个问题：

> Answer.new.save
 => true

原文

I am using Mongo Mapper and I'm trying to figure out how you make a document required. For example, I want to do something like this:

class Question
  include MongoMapper::Document

  many :answers
end

class Answer
  include MongoMapper::Document

  belongs_to :question, :required => true
end

But when I do, it's doesn't enforce that the answer have a question:

> Answer.new.save
 => true

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表情可笑 2024-12-29 21:20:19

MongoMapper 包含 ActiveModel::Validations，因此您可以像活动记录一样使用验证。以下内容应该有效：

class Question
  include MongoMapper::Document

  many :answers
end

class Answer
  include MongoMapper::Document

  belongs_to :question

  validates :question, :presence => true
end

您可以在此处查看 Rails 文档以获取有关这些验证的更多信息： http://api.rubyonrails.org/classes/ActiveModel/Validations/ClassMethods.html#method-i-validates

MongoMapper includes ActiveModel::Validations so you can use validations just like active record. The following should work:

class Question
  include MongoMapper::Document

  many :answers
end

class Answer
  include MongoMapper::Document

  belongs_to :question

  validates :question, :presence => true
end

You can check the rails docs for more info on those validations here: http://api.rubyonrails.org/classes/ActiveModel/Validations/ClassMethods.html#method-i-validates

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樱娆 2024-12-29 21:20:19

一些回调怎么样？

class Answer
  include MongoMapper::Document

  belongs_to :question

  def before_save
    # if question is nil, return false (this cancels save)
    return false unless question
    true
  end
end

What about some callbacks?

class Answer
  include MongoMapper::Document

  belongs_to :question

  def before_save
    # if question is nil, return false (this cancels save)
    return false unless question
    true
  end
end

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