Question

当我为用户创建脚手架时，我注意到在我的控制器的创建操作中，它列出了

@user = User.new(user_params)

并且实际上没有

@user.save

随处可见。但是，一切似乎都有效，新用户确实会保存到数据库中。为什么是这样？这个用户在哪里被保存，为什么他们使用.new而不是仅仅使用.create，这也会自动保存？

谢谢！

这是我的完整控制器：

    class UsersController < ApplicationController
  before_action :set_user, only: [:show, :edit, :update, :destroy]

  # GET /users
  # GET /users.json
  def index
    @users = User.all
    @portion = Portion.new
  end

  # GET /users/1
  # GET /users/1.json
  def show
    @allusers = User.all
    @rentbill = RentBill.last
  end

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

  # GET /users/1/edit
  def edit
  end

  # POST /users
  # POST /users.json
  def create
    @user = User.new(user_params)

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

  # PATCH/PUT /users/1
  # PATCH/PUT /users/1.json
  def update
    respond_to do |format|
      if @user.update(user_params)
        format.html { redirect_to @user, notice: 'User was successfully updated.' }
        format.json { render :show, status: :ok, location: @user }
      else
        format.html { render :edit }
        format.json { render json: @user.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /users/1
  # DELETE /users/1.json
  def destroy
    @user.destroy
    respond_to do |format|
      format.html { redirect_to users_url, notice: 'User was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_user
      @user = User.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def user_params
      params.require(:user).permit(:first_name, :last_name, :email_address, :admin, :pays_tv, :pays_internet)
    end

end

Answer 1

这是正确的行为：

def create
  @user = User.new(user_params)

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

它正在初始化一个新的用户对象然后响应。如果用户对象得到正确保存，则显示用户已成功创建＆＃39;否则显示错误消息并再次呈现新的用户表单。

.new方法在哪里保存在脚手架中？

1 个答案: