自动加载常量ORDER时检测到循环依赖性

时间：2014-04-12 20:27:34

标签： ruby-on-rails runtime-error circular-dependency

我正在使用Rails 4.1.0在Rails中使用Rails构建应用程序。

我在论坛上查找了这个问题：在自动加载常量ORDER时检测到循环依赖，发现由于rails版本而发生了可能的错误，因此更新了mt Gemfile以使用Rails 4.0.0

我收到此行的错误：                    ＆lt;％= f.label：pay_type％＆gt;
       ＆lt;％= f.text_field：pay_type，ORDER :: PAYMENT_TYPE，提示：'选择付款方式'％＆gt;                    ＆lt;％= f.submit'下订单'％＆gt;

我的表格是：

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

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

  <div class="field">
    <%= f.label :name %><br>
    <%= f.text_field :name, size: 40 %>
  </div>
  <div class="field">
    <%= f.label :address %><br>
    <%= f.text_area :address, rows: 3, cols: 40 %>
  </div>
  <div class="field">
    <%= f.label :email %><br>
    <%= f.text_field :email, size: 40 %>
  </div>
  <div class="field">
    <%= f.label :pay_type %><br>
    <%= f.text_field :pay_type, ORDER::PAYMENT_TYPE, prompt: 'Select a payment method' %>
  </div>
  <div class="actions">
    <%= f.submit 'Place Order' %>
  </div>
<% end %>

我的订单.rb是：

class Order < ActiveRecord::Base
    PAYMENT_TYPE = ["Check", "Credit Card", "Purchase Order"]
end

由于我必须在周一提交，否则我仍然会收到错误并且最终会解决问题。 :(：'（  这是完整的错误堆栈跟踪。有人可以帮助我！

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1 个答案:

答案 0 :(得分：2)

它不是ORDER::PAYMENT_TYPE，而是Order::PAYMENT_TYPE。注意Order类的情况。使用ORDER会提升NameError。

您还希望更改用于:pay_type的输入帮助程序，因为Order::PAYMENT_TYPE返回一个数组。 

<%= f.select :pay_type, Order::PAYMENT_TYPE, include_blank: 'Select a payment method' %>

此外，您希望使用include_blank选项代替prompt进行＆＃34;选择付款方式＆＃34;文本显示为默认选项。

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