使用MongoID，自定義身份驗證，密碼摘要失敗的Rspec測試

Question

我已完成rails教程http://ruby.railstutorial.org/，並試圖實現user model，但在MongoDB中使用MongoID。

我有以下代碼，它幾乎與本教程相同，但它在某個測試用例上失敗。

class User 
    include Mongoid::Document 
    include ActiveModel::SecurePassword 

    attr_accessible :name, :email, :password, :password_confirmation 

    field :name, type: String 
    field :email, type: String 
    field :password_digest, type: String 

    has_secure_password 

    before_save { |user| user.email = email.downcase } 

    email_regex = /\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i 

    validates :name, presence: true, length: { maximum: 50} 
    validates :email, presence: true, format: { with: email_regex }, 
            uniqueness: { case_sensitive: false } 
    validates :password, presence: true, length: { minimum: 5} 
    validates :password_confirmation, presence: true 
end 

和RSpec測試：

需要 'spec_helper'

describe User do 
    before do 
    @user = User.new(name: "Example User", email: "user@example.com", 
        password: "foobar", password_confirmation: "foobar") 
    end 

    subject { @user } 

    it { should respond_to(:name) } 
    it { should respond_to(:email) } 
    it { should respond_to(:password_digest) } 
    it { should respond_to(:password) } 
    it { should respond_to(:password_confirmation) } 
    it { should respond_to(:authenticate) } 

describe 'without a name' do 
    before { @user.name = "" } 
    it { should_not be_valid } 
    end 

describe 'without an email' do 
    before { @user.email = "" } 
    it { should_not be_valid } 
end 

    describe "when name is too long" do 
    before { @user.name = "a" * 51 } 
    it { should_not be_valid } 
    end 

    describe "when email format is invalid" do 
    it "should be invalid" do 
     addresses = %w[user@foo,com user_at_foo.org example.user@foo. 
        foo@bar_baz.com foo@bar+baz.com] 
     addresses.each do |invalid_address| 
     @user.email = invalid_address 
     @user.should_not be_valid 
     end  
    end 
    end 

    describe "when email format is valid" do 
    it "should be valid" do 
     addresses = %w[user@foo.COM A_US-ER@f.b.org frst.lst@foo.jp a+b@baz.cn] 
     addresses.each do |valid_address| 
     @user.email = valid_address 
     @user.should be_valid 
     end  
    end 
    end 

    describe "when email address is already taken" do 
    before do 
     user_with_same_email = @user.dup 
     user_with_same_email.email = @user.email.upcase 
     user_with_same_email.save 
    end 

    it { should_not be_valid } 
    end 

describe "when password is not present" do 
    before { @user.password = @user.password_confirmation = " " } 
    it { should_not be_valid } 
    end 

    describe "when password doesn't match confirmation" do 
    before { @user.password_confirmation = "mismatch" } 
    it { should_not be_valid } 
    end 

    describe "when password confirmation is nil" do 
    before { @user.password_confirmation = nil } 
    it { should_not be_valid } 
    end 

    describe "with a password that's too short" do 
    before { @user.password = @user.password_confirmation = "a" * 5 } 
    it { should be_invalid } 
    end 

    describe "return value of authenticate method" do 
    before { @user.save } 
    let(:found_user) { User.find_by(email: @user.email) } 

    describe "with valid password" do 
     it { should == found_user.authenticate(@user.password) } 
    end 

    describe "with invalid password" do 
     let(:user_for_invalid_password) { found_user.authenticate("invalid") } 

     it { should_not == user_for_invalid_password } 
     specify { user_for_invalid_password.should be_false } 
    end 
    end 
end 

在規範的失敗：

........F.......... 

Failures: 

    1) User return value of authenticate method with valid password 
    Failure/Error: it { should == found_user.authenticate(@user.password) } 
     expected: #<User _id: 50e30a678bffa61a9e000001, _type: nil, name: "Example User", email: "user@example.com", password_digest: "$2a$10$C6klW7B9ok4OIHFopy5AfuncvwNYTZqHWTbqpdd8gXmruSLlwizPO"> 
      got: #<User _id: 50e30f158bffa6df67000001, _type: nil, name: "Example User", email: "user@example.com", password_digest: "$2a$10$mDCz9JVPXGSvpGBwbyHIsuV/k.lJ/ux1TuvgRzxSLYlIna/CdztN2"> (using ==) 
     Diff: 
     @@ -1,2 +1,2 @@ 
     -#<User _id: 50e30a678bffa61a9e000001, _type: nil, name: "Example User", email: "user@example.com", password_digest: "$2a$10$C6klW7B9ok4OIHFopy5AfuncvwNYTZqHWTbqpdd8gXmruSLlwizPO"> 
     +#<User _id: 50e30f158bffa6df67000001, _type: nil, name: "Example User", email: "user@example.com", password_digest: "$2a$10$mDCz9JVPXGSvpGBwbyHIsuV/k.lJ/ux1TuvgRzxSLYlIna/CdztN2"> 
    # ./spec/models/user_spec.rb:89:in `block (4 levels) in <top (required)>' 

Finished in 1.79 seconds 
19 examples, 1 failure 

更新：

難道多一點diggig，並查詢測試數據庫，似乎數據在每個測試用例之前都沒有被清除。

Updat2：

我設法通過包括解決這一問題在我的規格助手如下：

config.before :each do 
    Mongoid.purge! 
    end 

但測試是明顯慢現在！任何想法如何加速？

Answer 1

問題是調用保存，它再現了password_digest

describe "return value of authenticate method" do 
    #before { @user.save } #comment this line 
    #.... 
end