01 用Ruby on Rails純手工打造一個包含CRUD的RESTful應用程式

Getting Started with Rails
用Ruby on Rails純手工打造一個包含CRUD的RESTful應用程式


1. 建立一個專案 $rails new sample02
$cd sample02

2.建立一個名為board的model，其中包含title與content兩個欄位 $rails g model board title:string content:text
$rake db:migrate 3.建立一個名為boards的controller $rails g controller boards

4.修改/config/routes.rb Sample02::Application.routes.draw do
resources :boards

5.修改/config/routes.rb Sample02::Application.routes.draw do
resources :boards
6./sample02/app/controllers/boards_controller.rb的基本結構有七組 class BoardsController < ApplicationController


def index
end

def show
end

def new
end

def create
end

def edit
end

def update
end

def destroy
end

end


7.首先要先建立boards的index與show頁，修改/sample02/app/controllers/boards_controller.rb class BoardsController < ApplicationController

def index
@boards = Board.all
end

def show
@board = Board.find(params[:id])
end

end
8.建立views內index頁，/sample02/app/views/boards/index.html.erb $vi ~/projects/sample02/app/views/boards/index.html.erb

9.建立views內show頁，/sample02/app/views/boards/show.html.erb $vi ~/projects/sample02/app/views/boards/show.html.erb

10.做到這邊，我們要來驗收一下成果，透過powder來開瀏覽器驗收吧。 $cd ~/projects/sample02
$powder link
$powder open 應該可以看到這個頁面。

11.完成create功能
修改/sample02/app/controllers/boards_controller.rb，加入new與create
class BoardsController < ApplicationController

def index
@boards = Board.all
end

def show
@board = Board.find(params[:id])
end

def new
@board = Board.new
end

def create
@board = Board.new(board_params)
if @board.save
redirect_to boards_path
else
render :new
end
end

private

def board_params
params.require(:board).permit(:title, :content)
end

end
/sample02/app/views/boards/new.html.erb
$vi ~/projects/sample02/app/views/boards/new.html.erb




12.完成edit功能
修改/sample02/app/controllers/boards_controller.rb，加入edit與update

class BoardsController < ApplicationController

def index
@boards = Board.all
end

def show
@board = Board.find(params[:id])
end

def new
@board = Board.new
end

def create
@board = Board.new(board_params)
if @board.save
redirect_to boards_path
else
render :new
end
end

def edit
@board = Board.find(params[:id])
end

def update
@board = Board.find(params[:id])
if @board.update(board_params)
redirect_to board_path(@board)
else
format.html { render :action => "edit" }
end
end

private

def board_params
params.require(:board).permit(:title, :content)
end

end
/sample02/app/views/boards/edit.html.erb
$vi ~/projects/sample02/app/views/boards/edit.html.erb


13.完成destroy功能
修改/sample02/app/controllers/boards_controller.rb，加入destroy
class BoardsController < ApplicationController

def index
@boards = Board.all
end

def show
@board = Board.find(params[:id])
end

def new
@board = Board.new
end

def create
@board = Board.new(board_params)
if @board.save
redirect_to boards_path
else
render :new
end
end

def edit
@board = Board.find(params[:id])
end

def update
@board = Board.find(params[:id])
if @board.update(board_params)
redirect_to board_path(@board)
else
format.html { render :action => "edit" }
end
end

def destroy
@board = Board.find(params[:id])
@board.destroy

redirect_to boards_path
end

private

def board_params
params.require(:board).permit(:title, :content)
end

end
完整的boards_controller.rb

14.完成CRUD功能囉，來驗收一下吧。
在瀏覽器上打上http://sample02.dev/boards/

顯示某一筆資料的show功能

新增資料的new功能

編輯資料的edit功能

刪除資料的destroy功能

01 用Ruby on Rails純手工打造一個包含CRUD的RESTful應用程式

02 用Ruby on Rails純手工打造一個具從屬關係的[討論區] (1)

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