在 rspec 中传递表单参数

Question

我正在使用acts_as_audited。在销毁操作的控制器中，我传递了审核注释值。所有这些都运行良好，但是当我尝试测试销毁操作时，我得到：

PurchasesController DELETE /destroy deletes the correct Purchase
 Failure/Error: delete :destroy, id: i
 NoMethodError:
  You have a nil object when you didn't expect it!  
  You might have expected an instance of Array.  
  The error occured while evaluating nil.[] 
# ./app/controllers/purchases_controller.rb:79:in `destroy'
# ./spec/controllers/purchases_controller_spec.rb:156:in `block (3 levels) in <top (required)>'

第 79 行读取：@purchase.audit_comment = params[:purchase][:audit_comment]

这是我的代码：

PurchasesController

def destroy
  @purchase = Purchase.find(params[:id])
  @purchase.audit_comment = params[:purchase][:audit_comment]
  respond_to do |format|
    if @purchase.destroy
      format.html { redirect_to(purchases_url, notice: "Successfully destroyed purchase.") }
      format.xml  { render :xml => @purchase, :status => :deleted, :location => @purchase }
    else
      flash[:alert] = "#{@purchase.po_number} could not be destroyed"
      render 'show'
    end
  end
end

购买 show.html.erb 已编辑

<%= form_for @purchase, method: :delete do |builder| %>

<% if @purchase.errors.any? %>
  <div id="error_explanation">
    <h2><%= pluralize(@purchase.errors.count, "error") %> prohibited this purchase from being saved:</h2>

    <ul>
    <% @purchase.errors.full_messages.each do |msg| %>
      <li><%= msg %></li>
    <% end %>
    </ul>
  </div>
<% end %>

<% title "Purchase" %>

<div id="delete_button">    
  <span><strong>PO Number:  <%= @purchase.po_number %></strong></span>
    <%= render "audit_comment", f: builder %>
    <%= builder.submit "Destroy Purchase"%>
</div>  
<% end %>
<p>
  <%= link_to "Edit", edit_purchase_path(@purchase) %> |
  <%= link_to "View All", purchases_path %>
</p>

_audit_comment.html.erb - 购买

<div id = "audit">
  <%= f.label :audit_comment %>:<br />
  <%= f.text_area :audit_comment, :size => "60x5" %>
</div>

purchase_controller_spec.rb

require 'spec_helper'
require 'ruby-debug'

describe PurchasesController do
  login_user
  render_views

  before(:each) do
    @purchase = Factory(:purchase)
  end

  describe "DELETE /destroy" do
    before(:each) do
      @ability.can :destroy, Purchase      
    end  
    it "deletes the correct Purchase" do
      i = @purchase.id
      c = Purchase.count
      pl = Purchase.find(i).purchase_line_items
      cpl = pl.count
      delete :destroy, id: i
      Purchase.count.should == c-1
      pl.count.should == cpl-1
      response.should redirect_to(purchases_path)
      flash[:notice].should == "Successfully destroyed purchase."
    end
    it "redirects to the index page with an alert when a delete fails" do
      i = @purchase.id
      c = Purchase.count
      pl = Purchase.find(i).purchase_line_items
      cpl = pl.count
      Purchase.any_instance.stubs(:valid?).returns(:false)
      delete :destroy, id: i
      Purchase.count.should_not == c-1
      pl.count.should_not == cpl-1
      response.should render_template('show')
      flash[:alert].should == "#{@purchase.po_number} could not be destroyed"
    end
  end
end

感谢任何帮助。谢谢！

Answer 1

它告诉您在第 79 行，params[:purchase] 为 nil。

它为零的原因是 button_to 生成自己的表单标记。因此，您现在在

中有一个 ，并且您的审核评论字段未提交。您应该使用 builder.submit，而不是 button_to。您还需要在对 form_for 的调用中设置 :method 选项，以使其成为 DELETE 请求。

编辑问题后更新

HTML 现在看起来不错，但我发现规范存在问题。我认为您忘记将审核注释传递到您的 HTTP 参数中。它位于 HTML 中，但您的规范绕过了表单，因为它单独测试控制器。 （集成测试将使用实际的表单。控制器测试则不会。）因此，您必须手动向请求添加控制器期望的任何表单参数。例如：

delete :destroy, :id => 1, :purchase => {:audit_comment => 'Test comment'}