Michael Hartl's Rails Tutorial第9章(第9.12节)测试失败"undefined local variable or method"

Question

我正在学习Michael Hartl的Rails教程，但在实现高级登录时，我在测试中遇到了麻烦(9.12节)

到目前为止，我已经通过了所有测试，但在测试使用有效信息登录时出现了错误。不知何故，似乎有些东西没有很好地定义或缺失。有什么帮助吗？感谢

测试输出

用户登录测试

require 'test_helper'
class UsersLoginTest < ActionDispatch::IntegrationTest
def setup
@user = users(:michael)
end
test "login with invalid information" do
get login_path
assert_template 'sessions/new'
post login_path, params: {session: {email:"", password:""}}
assert_template 'sessions/new'
assert_not flash.empty?
get root_path
assert flash.empty?
end
test "login with valid information" do
get login_path
post login_path, params: { session: { email: @user.email, password: 'password' } }
assert_redirected_to @user
follow_redirect!
assert_template 'users/show'
assert_select "a[href=?]", login_path, count: 0
assert_select "a[href=?]", logout_path
assert_select "a[href=?]", user_path(@user)
end
test "login with valid information followed by logout" do
get login_path
post login_path, params: { session: { email: @user.email, password: 'password' } }
assert is_logged_in?
assert_redirected_to @user
follow_redirect!
assert_template 'users/show'
assert_select "a[href=?]", login_path, count: 0
assert_select "a[href=?]", logout_path
assert_select "a[href=?]", user_path(@user)
delete logout_path
assert_not is_logged_in?
assert_redirected_to root_url
follow_redirect!
assert_select "a[href=?]", login_path
assert_select "a[href=?]", logout_path,      count: 0
assert_select "a[href=?]", user_path(@user), count: 0
end
end

SessionsHelper

module SessionsHelper
def log_in(user)
session[:user_id] = user.id
end
def current_user
if (user_id = session[:user_id])
@current_user ||= User.find_by(id: user_id)
elsif (user_id = cookies.signed[:user_id])
user = User.find_by(id: user_id)
if user && user.authenticated?(cookies[:remember_token])
log_in user
@current_user = user
end
end   
end
def remember(user)
user.remember
cookies.permanent.signed[user_id] = user.id
cookies.permanent[:remember_token] = user.remember_token
end
def logged_in?
!current_user.nil?
end
def forget
user.forget
cookies.delete(:user_id)
cookies.delete(:remember_token)   
end
def log_out
forget(current_user)
session.delete(:user_id)
@current_user = nil
end

完会话控制器

class SessionsController < ApplicationController
def new
end
def create
user = User.find_by(email: params[:session][:email].downcase)
if user && user.authenticate(params[:session][:password])
log_in user
remember user
redirect_to user
else
flash.now[:danger] = 'Invalid email/password combination'
render 'new'
end
end
def destroy
log_out
redirect_to root_url
end
end

Answer 1

您的测试输出显示在sessions_helper.rb的第18行有一个未定义的局部变量user_id。如果我们看看代码中的那一行，我们会看到这种方法：

def remember(user)
user.remember
cookies.permanent.signed[user_id] = user.id
cookies.permanent[:remember_token] = user.remember_token
end

尝试执行cookies.permanent.signed[user_id]时会发生错误。你可能忘记了冒号，本想说cookies.permanent.signed[:user_id]。如果没有冒号，ruby会认为user_id是一个局部变量，而不是一个符号，并且您看到的错误会被抛出。