这是我在这里的第一篇文章，所以希望我已经按照指南进行操作，但是如果有更好的发帖方式，请随时为我指明正确的方向 - 我学得很快。
我是 Rails 新手，正在学习 Hartl Rails 教程。我在谷歌和这里搜索了解决方案，但似乎无法找到为什么点击按钮“登录”测试失败的答案。
我还浏览了 rails casts 视频Railscasts #270 Authentication
我错过了什么，所以我可以让这些测试通过？任何帮助将不胜感激。
如果我使用 form_for，所有测试都通过，但当我在 .sessions/new.html.erb 中使用 form_tag 时失败。Sign_in 页面仍然可以正确呈现，但是一旦我尝试登录，网页就会显示以下错误：
def create
user = User.find_by(email: params[:session][:email].downcase)
这是我想要完成的练习 - 第 8 章，第 8.5 节，练习 1：
8.5 练习
- 重构登录表单以使用 form_tag 代替 form_for。确保测试套件仍然通过。提示：请参阅 RailsCast 中的 Rails 3.1 中的身份验证，并特别注意 params 哈希结构的变化。
.sessions/new.html.erb
<% provide(:title, "Sign in") %>
<h1>Sign in</h1>
<div class="row">
<div class="span6 offset3">
<%= form_tag sessions_path do %>
<%= label_tag :email %>
<%= text_field :email, params[:email] %>
<%= label_tag :password %>
<%= password_field_tag :password %>
<%= submit_tag "Sign in", class: "btn btn-large btn-primary" %>
<% end %>
<!--
<%= form_for(:session, url: sessions_path) do |f| %>
<%= f.label :email %>
<%= f.text_field :email %>
<%= f.label :password %>
<%= f.password_field :password %>
<%= f.submit "Sign in", class: "btn btn-large btn-primary" %>
<% end %>
-->
<p>New user? <%= link_to "Sign up now!", signup_path %></p>
</div>
</div>
这是 rspec spec/ 的输出
> Failures:
1) Authentication signin with invalid information
Failure/Error: before { click_button "Sign in" }
NoMethodError:
undefined method `[]' for nil:NilClass
# ./app/controllers/sessions_controller.rb:7:in `create'
# ./spec/requests/authentication_pages_spec.rb:19:in `block (4 levels) in <top (required)>'
2) Authentication signin with invalid information
Failure/Error: before { click_button "Sign in" }
NoMethodError:
undefined method `[]' for nil:NilClass
# ./app/controllers/sessions_controller.rb:7:in `create'
# ./spec/requests/authentication_pages_spec.rb:19:in `block (4 levels) in <top (required)>'
3) Authentication signin with invalid information after visiting another page
Failure/Error: before { click_button "Sign in" }
NoMethodError:
undefined method `[]' for nil:NilClass
# ./app/controllers/sessions_controller.rb:7:in `create'
# ./spec/requests/authentication_pages_spec.rb:19:in `block (4 levels) in <top (required)>'
4) Authentication signin with valid information
Failure/Error: fill_in "Email", with: user.email.upcase
Capybara::ElementNotFound:
Unable to find field "Email"
# ./spec/requests/authentication_pages_spec.rb:41:in `block (4 levels) in <top (required)>'
5) Authentication signin with valid information
Failure/Error: fill_in "Email", with: user.email.upcase
Capybara::ElementNotFound:
Unable to find field "Email"
# ./spec/requests/authentication_pages_spec.rb:41:in `block (4 levels) in <top (required)>'
6) Authentication signin with valid information
Failure/Error: fill_in "Email", with: user.email.upcase
Capybara::ElementNotFound:
Unable to find field "Email"
# ./spec/requests/authentication_pages_spec.rb:41:in `block (4 levels) in <top (required)>'
7) Authentication signin with valid information
Failure/Error: fill_in "Email", with: user.email.upcase
Capybara::ElementNotFound:
Unable to find field "Email"
# ./spec/requests/authentication_pages_spec.rb:41:in `block (4 levels) in <top (required)>'
8) Authentication signin with valid information followed by signout
Failure/Error: fill_in "Email", with: user.email.upcase
Capybara::ElementNotFound:
Unable to find field "Email"
# ./spec/requests/authentication_pages_spec.rb:41:in `block (4 levels) in <top (required)>'
.....
./spec/requests/authentication_pages_spec.rb
require 'spec_helper'
describe "Authentication" do
subject { page }
describe "signin page" do
before { visit signin_path }
it { should have_content('Sign in') }
it { should have_title('Sign in') }
end
#Testing for sign in failure
describe "signin" do
before { visit signin_path }
describe "with invalid information" do
before { click_button "Sign in" }
it { should have_title('Sign in') }
# This uses Capabara have_selector method
# dot means "class" in CSS testing for div tag with classes "alert"
# and "alert-error" and the error message contains "invalid"
it { should have_selector('div.alert.alert-error', text: 'Invalid') }
describe "after visiting another page" do
before { click_link "Home" }
it { should_not have_selector('div.alert.alert-error') }
end
end
# Testing for sign success
describe "with valid information" do
# This is using FactoryGirl gem
let(:user) { FactoryGirl.create(:user) }
before do
fill_in "Email", with: user.email.upcase
fill_in "Password", with: user.password
click_button "Sign in"
end
# Uses Capybara's have_link method - takes arguments as text
# of the link and optional :href
it { should have_title(user.name) }
it { should have_link('Profile', href: user_path(user)) }
it { should have_link('Sign out', href: signout_path) }
it { should_not have_link('Sign in', href: signin_path) }
describe "followed by signout" do
before { click_link "Sign out" }
it { should have_link('Sign in') }
end
end
end
end
./app/controllers/sessions_controller.rb
class SessionsController < ApplicationController
def new
end
def create
user = User.find_by(email: params[:session][:email].downcase)
if user && user.authenticate(params[:session][:password])
# Sign the user in and redirect to the user's show page.
sign_in user
redirect_to user
else
# Flash [:error] comes from bootstap CSS
flash.now[:error] = 'Invalid email/password combination'
# This line activates the link signin to show the page view new.html.erb
render 'new'
end
end
def destroy
sign_out
redirect_to root_url
end
end