rails 實現登入和註冊功能
思路：使用者註冊需要user這個model, user控制器控制使用者的註冊功能，session控制器控制使用者的登入功能,welcome控制器控制使用者登入和退出的跳轉,為了表單友好，增加bootstrap樣式
生成User modelrails g model user
修改db/migrate生成的檔案
class CreateUsers < ActiveRecord::Migration
def change
create_table :users do |t|
t.string :username
t.string :password
t.timestamps null: false
end
end
end
遷移檔案
rake db:migrate
模型驗證
class User < ActiveRecord::Base
validates :username, presence: { message: "使用者名稱不能為空" }
validates :username, uniqueness: { message: "使用者名稱已存在" }
validates :password, presence: { message: "密碼不能為空" }
validates :password, length: { minimum: 6, message: "密碼長度最短為6位" }
end
rails g controller users
rails g controller sessions
rails g controller welcome
生成對應的路由
resources :users
resources :sessions
root "welcome#index"
生成登錄檔單
views/users/new.html.erb
<div class="row">
<div class="col-sm-5">
<%= form_for @user, url: users_path, method: :post do |f| %>
<div class="form-group">
<ul class="list-unstyled">
<% @user.errors.messages.values.flatten.each do |error| %>
<li><i class="fa fa-exclamation-circle"></i> <%= error %></li>
<% end -%>
</ul>
</div>
<div class="form-group">
<%= f.text_field :username, class: "form-control", placeholder: "使用者名稱" %>
</div>
<div class="form-group">
<%= f.password_field :password, class: "form-control", placeholder: "密碼" %>
</div>
<%= f.submit "註冊", class: "btn btn-primary" %>
<%= link_to "登入", new_session_path %>
<% end -%>
</div>
<div class="col-sm-7">
</div>
</div>
user_controller.rb
def new
@user = User.new
end
def create
@user = User.new(params.require(:user).permit(:username, :password))
if @user.save
flash[:notice] = '註冊成功,請登入'
redirect_to new_session_path
else
render action: :new
end
end
end
生成登入表單
views/sessions/new.html.erb
<div class="row">
<div class="col-sm-4">
<%= form_tag sessions_path, method: "post" do %>
<div class="form-group">
<input type="text" name="username" placeholder="使用者名稱..." class="form-control" id="form_username" title="使用者名稱6-12個字元">
</div>
<div class="form-group">
<input type="password" name="password" placeholder="密碼..." class="form-control" id="form_password">
</div>
<input type="submit" class="btn btn-primary" value="登入" />
<%= link_to "註冊", new_user_path %>
<% end %>
</div>
<div class="col-sm-8">
</div>
</div>
sessions_controller.rb
class SessionsController < ApplicationController
def create
@user = User.find_by(username: params[:username], password: params[:password])
if @user
session[:user_id] = @user.id
flash[:notice] = '登入成功'
redirect_to root_path
else
flash[:notice] = "使用者名稱或者密碼不正確"
render action: :new
end
end
def destroy
session[:user_id] = nil
flash[:notice] = "退出成功"
redirect_to root_path
end
end
首頁表單
views/welcome/index.html.erb
<% if @user %><h1>歡迎你, <%= @user.username %></h1>
<% else %>
<h1>Circles 首頁</h1>
<% end -%>
修改layouts/application.html.erb 檔案
<!DOCTYPE html>
<html>
<head>
<title>Circles</title>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<%= stylesheet_link_tag 'application', media: 'all' %>
<%= javascript_include_tag 'application' %>
<%= csrf_meta_tags %>
</head>
<body>
<header name="top">
<nav class="navbar navbar-default navbar-fixed-top nav-color" role="navigation" id="nav">
<div class="container">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header nav-color">
<button id="nav_collapse" type="button" class="navbar-toggle toggle-btn" data-toggle="collapse" data-target="#bs-navbar-collapse-1" aria-controls="bs-navbar-collapse-1">
<span class="fa fa-bars fa-lg"></span>
</button>
<a class="navbar-brand custom-logo-link" href="/">
Circles
</a>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse nav-submenu-color collapse" id="bs-navbar-collapse-1">
<ul class="nav navbar-nav navbar-right custom">
<li>
<a href="/">Home</a>
</li>
<% if session[:user_id] %>
<li><%= link_to "#{User.find_by(session[:user_id]).username}, 退出", session_path(session[:user_id]), method: 'delete' %></li>
<% else %>
<li><%= link_to "登入", new_session_path %></li>
<% end -%>
</ul>
</div>
<!-- /.navbar-collapse -->
</div>
<!-- /.container-->
</nav>
</header>
<div class="container body-offset">
<% if flash[:notice] %>
<div class="alert alert-info"><%= flash[:notice] %></div>
<% end -%>
<%= yield %>
</div>
</body>
</html>