Question

我有一个用户模型和一个友谊模型。

class Friendship < ActiveRecord::Base
  belongs_to :sender, :class_name=>'User', :foreign_key=>'sender_id'
  belongs_to :receiver, :class_name=>'User', :foreign_key=>'receiver_id'

  validates_presence_of :receiver_id, :sender_id
  validates_associated :receiver, :sender
end

class User < ActiveRecord::Base
  has_many :sent_friendships, :class_name => "Friendship", :foreign_key => "sender_id", :dependent => :destroy
  has_many :received_friendships, :class_name => "Friendship", :foreign_key => "receiver_id", :dependent => :destroy
end

我的一个rspec测试是

describe Friendship do

  before(:each) do
    @valid_attributes = {
      :sender_id => 1,
      :receiver_id => 2,
      :accepted_at => nil
    }
  end

  it "should not be valid with non-existant receiver_id" do
    f = Friendship.new(@valid_attributes)
    f.receiver_id = 99999
    f.should_not be_valid
  end
end

测试不应该是有效的，因为没有User with user_id 9999.但是测试说友谊模型是有效的。

为什么地狱？

编辑：

但是我想像上面提到的那样测试 - ＆gt;没有直接分配发件人。那可能吗？

Answer 1

如果您希望您的模型以这种方式工作，请更改此：

validates_presence_of :receiver_id, :sender_id

到此：

validates_presence_of :receiver, :sender

Answer 2

validates_associtated的Rails文档说明如下：

注意：如果尚未分配关联，则此验证不会失败。如果您想确保关联存在且保证有效，您还需要使用validates_presence_of。

你没有指定协会。按如下方式修改您的测试，它应该通过：

it "should not be valid with non-existant receiver_id" do
  f = Friendship.new(@valid_attributes)
  f.receiver_id = 99999
  f.receiver = nil  # Note this line
  f.should_not be_valid
end

Answer 3

还有一个旧的插件浮动，这样做...... validates_existence_of。

http://blog.hasmanythrough.com/2007/7/14/validate-your-existence

Answer 4

嗯..

在我发现只有这个博客条目和rails lighthouse中的wont-fix-ticket之后：

Blog-entry with solution

Lighthouse-wont-fix-ticket

我切换到我自己的解决方案：

class Friendship < ActiveRecord::Base
  belongs_to :sender, :class_name=>'User', :foreign_key=>'sender_id'
  belongs_to :receiver, :class_name=>'User', :foreign_key=>'receiver_id'

  validates_presence_of :receiver_id, :sender_id

  validate :sender_exists
  validate :receiver_exists

  protected
  def sender_exists
    errors.add("sender_id", "not existant") unless User.exists?(self.sender_id)
  end  
end

使用rspec，validates_associated和validates_presence_of无法正常工作？

4 个答案: