用于NilClass的未定义方法`model_name':Class,在视图之间传递一个表单

时间:2013-02-03 19:55:16

标签: ruby-on-rails ruby rails-activerecord

刚开始学习rails,我正试图将表单从一个视图传递到另一个视图......我假设这样做的方法是使用部分渲染。

我想将/ users / form中包含的表单的partial传递给home视图中的index.html.erb。我只想创建一个新用户,但是在主视图中从i​​ndex.html.erb。

相关守则:

_form.html.erb(在用户视图中)

<%= simple_form_for(@user) do |f| %>
  <%= f.error_notification %>

  <div class="form-inputs">
    <%= f.input :email %>
    <%= f.input :condition, :hint => 'what should we look up for you?'%>
  </div>

  <div class="form-actions">
    <%= f.button :submit, 'Begin curation' %>

  </div>
<% end %>

用户模型(user.rb)

class User < ActiveRecord::Base
  attr_accessible :condition, :email, :name
end

users_controller.rb

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: 'Thanks for sharing. We will be back with your curated information in 2-3 days time!' }
        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

我确定这是一个简单的修复,我只是不知道语法。我检查了其他地方,但没有找到任何可以帮助我的地方。

1 个答案:

答案 0 :(得分:3)

我敢打赌我的生活中你没有定义@user变量。 SimpleForm需要来自正确模型的实例变量才能有效地利用输入字段实现其魔力。如果您的变量未实例化,则会出现该错误。

在NilClass上调用model_name。 NilClass是你的@user。

请改为尝试:

<%= simple_form_for User.new do |f| %>
...

更新

# app/controllers/users_controller.rb
class UsersController < ApplicationController

  before_filter :prepare_user_form, only: [:index, :new]

  protected

  def prepare_user_form
    @user = User.new
  end

end


# _form.html.erb
<%= simple_form_for @user do |f| %>
...