Question

我在提交应该通过FarmsController和UsersController创建服务器场的表单（views / users / show.html.erb）时出现此错误：

农场中的NoMethodError #create

显示/ media / rok / LOCAL DISC / Users / Koko / Documents / KMETIJE / kmetije / app / views / users / show.html.erb第42行引出：

未定义的方法`farm'代表nil：NilClass

提取的来源（第42行）：

39:         
40:         <div id="show">
41:             <h2>Seznam kmetij</h2>
42:             <% unless @user.farms.empty? %>
43:                 <table id="farms">
44:                     <tr>
45:                         <th>Ime</th>

app / views / users / show.html.erb:42:in _app_views_users_show_html_erb___3046909201139407898_28545460_3894795499615530291' app/controllers/farms_controller.rb:14:in创建'

以下是FarmsController中有问题的创建操作：

class FarmsController < ApplicationController

  def new
    @farm = current_user.farms.build
  end

  def create
    @farm = Farm.new(params[:farm])
    if @farm.save
      redirect_to 'users/show'
    else
      render 'users/show'
    end
  end  
end

以下是发布show动作的UsersController，它应该在视图中显示结果：

class UsersController < ApplicationController

  def show
    @user = User.find(params[:id])
    @farms = @user.farms.paginate(:page => params[:page])
  end

end

这是视图，它具有在（id =“add”）中添加服务器场的形式，还应该在（id =“show”）中显示创建的服务器场：

<body>

    <div id="add">
        <h2>Dodaj kmetijo</h2><br />
        <%= form_for(:farm, :url => farms_path) do |f| %>
            <%= f.label :name, "Ime kmetije" %><br />
            <%= f.text_field :name %>
            <%= f.label :region, "Območje" %><br />
            <%= f.text_field :region %>
            <%= f.label :north, "Geografska širina" %><br />
            <%= f.text_field :north %>
            <%= f.label :east, "Geografska dolžina" %><br />
            <%= f.text_field :east %>
            <%= f.label :description, "Opis" %><br />
            <%= f.text_area :description, rows: "6" %><br />
            <%= f.label :categories, "Kategorije" %><br />
            <%= f.text_area :categories, rows: "1" %><br />
            <%= f.label :products, "Izdelki" %><br />
            <%= f.text_area :products, rows: "2" %><br />
            <%= f.submit "Vstavi" %>
        <% end %>
    </div>      

    <div id="show">
        <h2>Seznam kmetij</h2>
        <% unless @user.farms.empty? %>
            <table id="farms">
                <tr>
                    <th>Ime</th>
                    <th>Regija</th>
                    <th>N</th>
                    <th>E</th>
                    <th>Opis</th>
                    <th>Kategorije</th>
                    <th>Izdelki</th>
                    <th>Izbris</th>
                </tr>
                <tr>
                    <td><%= farm.name %></td>
                    <td><%= farm.region %></td>
                    <td><%= farm.north %></td>
                    <td><%= farm.east %></td>
                    <td><%= farm.description %></td>
                    <td><%= farm.categories %></td>
                    <td><%= farm.products %></td>
                    <td><%= link_to "delete", farm, :method => :delete, :confirm => "Izbrišem?", :title => farm.name %></td>
                </tr>
            </table>
            <%= will_paginate @farms %>
        <% end %>
    </div>
</body>

Farm模型中还有一个连接（farm belongs_to：user）：

class Farm < ActiveRecord::Base
  attr_accessible :name, :region, :north, :east, :description, :categories, :products

  belongs_to :user

  validates :name, :presence => true
  validates :region, :presence => true
  validates :north, :presence => true
  validates :east, :presence => true
  validates :description, :presence => true
  validates :categories, :presence => true
  validates :products, :presence => true
  validates :user_id, :presence => true

  default_scope :order => 'farms.region DESC'
end

还有用户模型：

class User < ActiveRecord::Base
  attr_accessor :password
  attr_accessible :name, :password, :password_confirmation

  has_many :farms

  validates :name, :presence => true,
  validates :password, :presence => true,
                       :confirmation => true,
end

感谢您的时间和精力！

Answer 1

在farm控制器的create方法中定义@ user = current_user，或者在show.html.erb中使用current_user而不是@user。

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1 个答案: