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我知道有很多问题，但是我尝试过的每个解决方案都不起作用。我正在尝试创建登录表单，但出现以下错误表单中的第一个参数不能包含 nil 或为空

替换@user为User.new将解决错误，但我无法检查@user.errors.any..

有什么建议么？

<h1>Sign up</h1>

<div class="row">
  <div class="span6 offset7">
    <%= form_for @user do |f| %>

      <% if @user.errors.any? %>
        <div id="error_explanation">
        <h2><%= pluralize(@user.errors.count, "error") %> prohibited this user from being saved:</h2>
        <ul>
          <% @user.errors.full_messages.each do |msg| %>
            <li><%= msg %></li>
          <% end %>
        </ul>
        </div>
      <% end %>


      <%= f.label :name %>
      <%= f.text_field :name %>

      <%= f.label :email %>
      <%= f.text_field :email %>

      <%= f.label :password %>
      <%= f.password_field :password %>

      <%= f.label :password_confirmation, "Confirmation" %>
      <%= f.password_field :password_confirmation %>
      <br>
      <%= f.submit "Create my account", class: "btn btn-large btn-primary" %>
    <% end %>
  </div>
</div>

我的控制器代码是

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

  def new
        @user = User.new
  end

  # POST /user
  # POST /user.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 action: 'show', status: :created, location: @user }
      else
        format.html { render action: 'new' }
        format.json { render json: @user.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /user/1
  # PATCH/PUT /user/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 { head :no_content }
      else
        format.html { render action: 'edit' }
        format.json { render json: @user.errors, status: :unprocessable_entity }
      end
    end
  end

  def edit
  end

  # DELETE /user/1
  # DELETE /user/1.json
  def destroy
    @user.destroy
    respond_to do |format|
      format.html { redirect_to users_url }
      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(:name, :email, :password)
    end


end
4

1 回答 1

3

在您的编辑、更新和删除操作中，您没有设置@user。您可能应该更改之前的过滤器：

before_action :set_user, only: [:show, :edit, :update, :destroy]

或者

before_action :set_user, except: [:index, :new]
于 2013-10-04T22:58:42.017 回答