Rails Routes.rb

Question

如果routes.rb文件仅指定以下内容，rails如何知道如何映射到控制器中的每个函数：

resources :users

但是在UsersController中，你有

class UsersController < ApplicationController
  # GET /users
  # GET /users.json
  def index
    @users = User.all

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

  # GET /users/1
  # GET /users/1.json
  def show
    @user = User.find(params[:id])

    respond_to do |format|
      format.html # show.html.erb
      format.json { render :json => @user }
    end
  end

  # GET /users/new
  # GET /users/new.json
  def new
    @user = User.new

    respond_to do |format|
      format.html # new.html.erb
      format.json { render :json => @user }
    end
  end

  # GET /users/1/edit
  def edit
    @user = User.find(params[:id])
  end

  # POST /users
  # POST /users.json
  def create
    @user = User.new(params[:user])

    respond_to do |format|
      if @user.save
        format.html { redirect_to @user, :notice => 'User was successfully created.' }
        format.json { render :json => @user, :status => :created, :location => @user }
      else
        format.html { render :action => "new" }
        format.json { render :json => @user.errors, :status => :unprocessable_entity }
      end
    end
  end

  # PUT /users/1
  # PUT /users/1.json
  def update
    @user = User.find(params[:id])

    respond_to do |format|
      if @user.update_attributes(params[:user])
        format.html { redirect_to @user, :notice => 'User was successfully updated.' }
        format.json { head :no_content }
      else
        format.html { render :action => "edit" }
        format.json { render :json => @user.errors, :status => :unprocessable_entity }
      end
    end
  end

  # DELETE /users/1
  # DELETE /users/1.json
  def destroy
    @user = User.find(params[:id])
    @user.destroy

    respond_to do |format|
      format.html { redirect_to users_url }
      format.json { head :no_content }
    end
  end
end

例如，rails如何确定index function maps映射到GET/users，而create function映射到POST/users

resources :users如何知道映射到UsersController

Answer 1

Rails基于“约定重于配置”的范例。

因此，"resources :users“行表明所有标准的CRUD方法都由相应的UsersController <--”Users“前缀与控制器、模型等匹配。

Answer 2

请查看rails路线指南：http://guides.rubyonrails.org/routing.html

要查看routes声明在您的项目目录中执行此命令的实际效果：

rake路由

同样，正如前面提到的，坚持约定，并记住rails是一个非常固执己见的软件。