rails3-controller： respond_with

环境：ruby 1.9.3p0，rails 3.2.6

 

介绍rails3-controller除了默认的respond_to外的respond_with

使用rails脚手架生成的controller默认是这样的

 

 

  def index
    @students = Student.all

    respond_to do |format|
      format.html # index.html.erb
      format.json { render json: @students }
    end
  end

 通过format来匹配浏览器发送的请求，返回响应的页面

 

respond_with的用法：

 

在controller首行加上要处理的请求类型，比如 respond_to :html, :json

 

 

class StudentsController < ApplicationController
  respond_to :html, :json #新增
end

 然后，index函数可以使用respond_with，参数就是@students

 

 

  def index
    @students = Student.all
    respond_with(@students)
  end

 如果向设置返回页面，使用参数 :location

 

 

class StudentsController < ApplicationController
  respond_to :html, :json
  # GET /students
  # GET /students.json
  def index
    @students = Student.all
    respond_with(@students)
  end

  # GET /students/1
  # GET /students/1.json
  def show
    @student = Student.find(params[:id])
    respond_with(@student)
  end

  # GET /students/new
  # GET /students/new.json
  def new
    @student = Student.new
    respond_with(@student)
  end

  # GET /students/1/edit
  def edit
    @student = Student.find(params[:id])
  end

  # POST /students
  # POST /students.json
  def create
    @student = Student.new(params[:student])
    if @student.save
      flash[:notice] = 'Student was successfully created.'
    end
    respond_with(@student,:location=> students_url)
  end

  # PUT /students/1
  # PUT /students/1.json
  def update
    @student = Student.find(params[:id])
    if @student.update_attributes(params[:student])
      flash[:notice] = 'Student was successfully destroy.'
    end
    respond_with(@student, :location=> students_url)
  end

  # DELETE /students/1
  # DELETE /students/1.json
  def destroy
    @student = Student.find(params[:id])
    @student.destroy
    flash[:notice] = 'Student was successfully destroy.'
    respond_with(@student)
  end
end

 

respond_with 支持block，用来重写默认的返回页面

 

 

  def update
    @student = Student.find(params[:id])
    if @student.update_attributes(params[:student])
      flash[:notice] = 'Student was successfully destroy.'
    end
    respond_with(@student, :location=> students_url) do |format|
      format.html { render :text => "hello, rails"}
    end
  end

 

这样再次更新数据的时候， 返回的结果就是  hello, rails

 

转载请注明：http://michael-roshen.iteye.com/blog/1669665