Question

在我的“帐户”模型的“显示”页面上，我有一个“清单”模型。我希望能够在帐户的显示页面中检查核对清单上的每个布尔值的开/关。我收到以下错误：

NoMethodError in Accounts#show
undefined method `model_name' for NilClass:Class

应用程序/模型/ account.rb

class Account < ActiveRecord::Base
  has_one :checklist
end

应用程序/模型/ checklist.rb

class Checklist < ActiveRecord::Base
  belongs_to :account
  belongs_to :user

  validates :account_id, :presence => true
  validates :user_id, :presence => true
end

应用程序/模型/ user.rb

class User < ActiveRecord::Base
  has_many :checklists
end

应用程序/控制器/ account_controller.rb

class AccountController < ApplicationController
  def show
    @account = Account.find(params[:id])
    @checklist = @account.checklist
  end
end

应用程序/视图/帐户/ show.html.erb

<% simple_form_for(@checklist) do |checklist| %>
  <div>
    <%= checklist.user.email %>
    <div class="pull-right">
      <%= checklist.created_at.strftime("%b. %d %Y") %>
    </div></br>
    <ul>
      <li><%= checklist.contract_signed %></li>
      <li><%= checklist.contract_details %></li>
      <li>…</li>
    </ul>
    <%= f.submit "Update", class: 'btn' %>
  </div>
<% end %>

应用程序/控制器/ checklists_controller.rb

class ChecklistsController < ApplicationController
  before_filter :authenticate_user!

  def create
    @account = Account.find(params[:account_id])
    @checklist = @account.checklist.build(params[:checklist])
    @checklist.user = current_user

    respond_to do |format|
      if @checklist.save
        format.html { redirect_to(@account, :notice => 'Checklist Saved.') }
      else
        format.html { redirect_to(@account, :notice => 'There was an errors') }
      end
    end
  end


  def destroy
    @checklist = current_user.checklists.find(params[:id])
    @account = Account.find(params[:account_id])
    @checklist.destroy

    respond_to do |format|
      format.html { redirect_to @account }
    end
  end
end

Answer 1

我不确定我是否完全理解您的视图逻辑，但我认为您需要做的是在到达控制器的create部分之前构建核对表。

e.g。

  def show
    @account = Account.find(params[:id])
    @checklist = @account.build_checklist
  end

这将允许您调用正在显示的视图中的属性。

您还可以使用new而不是build

将create方法调整为

def create
  @account = Account.find(params[:account_id])
  @checklist = @account.checklist.new(params[:checklist])
  @checklist.user = current_user

  respond_to do |format|
      if @checklist.save
        format.html { redirect_to(@account, :notice => 'Checklist Saved.') }
      else
        format.html { redirect_to(@account, :notice => 'There was an error saving your comment (empty comment or comment way to long).') }
      end
  end
end

希望这会有所帮助：）

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1 个答案: