NameError：在Rspec的未初始化不断

所以，我运行Rspec的，并试图找出为什么我收到此错误：NameError：在Rspec的未初始化不断

Failure/Error: 3.times {@post.votes.create(value: 1) } 
NameError: 
    uninitialized constant Vote::PostId

这里是我的规格/型号/ post_spec.rb文件：

require 'rails_helper' 

describe Post do 
describe "vote methods" do 

before do 
    @post = Post.create(title: 'post title', body: 'Post bodies must be pretty long.') 
    3.times {@post.votes.create(value: 1) } 
    2.times {@post.votes.create(value: -1) } 
end 

describe '#up_votes' do 
    it "counts the number of votes with value = 1" do 
    expect(@post.up_votes).to eq(3) 
    end 
end 

describe '#down_votes' do 
    it "counts the number of votes with value = -1" do 
    expect(@post.down_votes).to eq(2) 
    end 
end 

describe '#points' do 
    it "returns the sum of all down and up votes" do 
    expect(@post.points).to eq(1) # 3 - 2 
    end 
end 
end 
end

我不明白为什么它将该行作为错误，因为它为Rspec执行创建数据。当试图在我的任何文件中找到“Vote :: PostId”时，找不到它。

来源

2014-09-30 Bart Dangus