Rails简单的项目研究笔记一

这个项目是

https://github.com/chucai/Ruby-on-Rails-Tutorial-by-Michael-Hartl--v3.2-


有比较网站的Rails测试代码，项目比较小，只有三张表，但是代码结构简单，思路清晰，有非常多的值得借鉴和学习的地方。

所有做了这个研究笔记。



1. 实现的功能有：

• 集成了cucumber 和 rspec测试

• 自己定义的用户认证[没有使用devise]

• 简单的微博类型的跟随

• 简单的micropost提交

• 使用了bootstrap 框架



这个小系统所具备的功能有：

1， 登录与注册

2， 跟随某人

3， 个人首页

4， 写微博







2. 如何在where中使用占用符?

private

# Returns an SQL condition for users followed by the given user.

# We include the user's own id as well.

def self.followed_by(user)

followed_user_ids = %(SELECT followed_id FROM relationships

WHERE follower_id = :user_id)

where("user_id IN (#{followed_user_ids}) OR user_id = :user_id",

{ user_id: user })

end





rspec中的subject , it 使用实例

let(:follower) { FactoryGirl.create(:user) }

let(:followed) { FactoryGirl.create(:user) }

let(:relationship) do

follower.relationships.build(followed_id: followed.id)

end

subject { relationship }

it { should be_valid }



describe "follower methods" do

before { relationship.save }

it { should respond_to(:follower) }

it { should respond_to(:followed) }

its(:follower) { should == follower }

its(:followed) { should == followed }

end

subject 是it 后默认的变量

its(:symbol) 是从 let 中取值



css选择器 选择页面中的元素

it { should have_selector('h1', text: heading) }

3. rspec如何就行ajax测试

it "should decrement the Relationship count" do

expect do

xhr :delete, :destroy, id: relationship.id

end.should change(Relationship, :count).by(-1)

end



4. 如何写cucumber的测试用例，如下的代码可以参考



Feature: Signing in



Scenario: Unsuccessful signin

Given a user visits the signin page

When he submits invalid signin information

Then he should see an error message



Scenario: Successful signin

Given a user visits the signin page

And the user has an account

And the user submits valid signin information

Then he should see his profile page

And he should see a signout link

定义了两个场景， 注册成功和注册失败， 如下是step文件

Given /^a user visits the signin page$/ do

visit signin_path

end

When /^he submits invalid signin information$/ do

click_button "Sign in"

end

Then /^he should see an error message$/ do

page.should have_selector('div.alert.alert-error')

end

Given /^the user has an account$/ do

@user = User.create(name: "Example User", email: "user@example.com",

password: "foobar", password_confirmation: "foobar")

end

When /^the user submits valid signin information$/ do

visit signin_path

fill_in "Email", with: @user.email

fill_in "Password", with: @user.password

click_button "Sign in"

end

Then /^he should see his profile page$/ do

page.should have_selector('title', text: @user.name)

end

Then /^he should see a signout link$/ do

page.should have_link('Sign out', href: signout_path)

end