rails不能用has_one DSL创建嵌套模型

Question

我使用Rails3.2.8做一些练习，这里是我的模型:

class Incident < ActiveRecord::Base
  attr_accessible :category, :user, :status, :reference, :location
  belongs_to :user
  has_one :location
  accepts_nested_attributes_for :location
  validates_presence_of :location, :user, :category

end
class Location < ActiveRecord::Base
  attr_accessible :latitude, :longitude, :street
  belongs_to :incident
end

下面是我的测试:

require 'spec_helper'
describe Incident do
  before (:each) do
    @user = create(:user, :name => "user1")
    @incident_data = {:category => "House Break in", :user => @user,
                      :location => {:latitude => "-28.1940509", :longitude => "28.0359692",
                                    :street => "abc name"}}
  end
  describe "After create Incident successfully" do
    it "should create location" do
      incident = Incident.create(@incident_data)
      expect(incident.location.latitude).to eq("-28.1940509")
    end
  end
end

我想做的是在创建事件对象时自动创建位置对象。但是测试失败的原因如下:

失败/错误:incident = incident .new(@incident_data)

ActiveRecord:: AssociationTypeMismatch:

Location(#70156311891820) expected, got Hash(#70156307112200)

任何想法?

Answer 1

它明确地说location应该是Location的一个实例，而不是Hash。你有

:location => {:latitude => "-28.1940509", :longitude => "28.0359692",
                                :street => "abc name"}

但是一旦你使用嵌套属性，它应该是location_attributes(见nestedatattributes文档):

:location_attributes => {:latitude => "-28.1940509", :longitude => "28.0359692",
                                :street => "abc name"}

或者直接创建Location对象

:location => Location.new(:latitude => "-28.1940509", :longitude => "28.0359692",
                                :street => "abc name")