以新格式显示rails rails id text_field rails 4

Question

我正在尝试在order模型中创建表单。我一直在想。我可以在创建新订单时在order_id文本字段中显示新的order_number吗？我试试

<%= form_for(@order, html: {class: 'form form-horizontal'}) 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 %>
<table class="table table-hover">
    <tr>
        <td><%= f.label :staff_id %>
        </td>
        <td><%= f.collection_select :staff_id, Staff.all, :id, :staff_name, {:prompt => false}%>
        </td>
    </tr>
    <tr>
        <td><%= f.label :customer_id %>
        </td>
        <td><%= f.collection_select :customer_id, Customer.all, :id, :customer_name, {:prompt => false}%>
        </td>
    </tr>
    <tr>
        <td><%= f.label :service_id %>
        </td>
        <td><%= f.collection_select :service_id, Service.all, :id, :service_type, {:prompt => false}%>
        </td>
    </tr>
    <tr>
        <td><%= f.label :order_number %>
        </td>
        <td><%= f.text_field :order_number , :value => @order.id %>
        </td>
    </tr>
    <tr>
        <td><%= f.label :order_vehicle %>
        </td>
        <td><%= f.text_field :order_vehicle %>
        </td>
    </tr>
    <tr>
        <td><%= f.label :order_plate %>
        </td>
        <td><%= f.text_field :order_plate %>
        </td>
    </tr>
    <tr>
        <td><%= f.label :order_description %>
        </td>
        <td><%= f.text_field :order_description %>
        </td>
    </tr>
    <tr>
        <td><%= f.label :order_damage %>
        </td>
        <td><%= f.text_field :order_damage %>
        </td>
    </tr>
    <tr>
        <td><%= f.label :order_deposit %>
        </td>
        <td><%= f.number_field :order_deposit %>
        </td>
    </tr>
    <tr>
        <td><%= f.label :order_price %>
        </td>
        <td><%= f.number_field :order_price %>
        </td>
    </tr>
    <tr>
        <td><%= f.label :order_date %>
        </td>
        <td><%= f.date_select :order_date %>
        </td>
    </tr>
    <tr>
        <td><%= f.label "List of task" %>
        </td>
        <td><%= f.collection_check_boxes :task_ids, Task.all, :id, :task_name do |b| %>
    <div class="collection-check-box">
      <%= b.check_box %>
      <%= b.label %>
    </div>
  <% end %>
        </td>
        
    </tr>
    <tr>
        <td>
        </td>
        <td><%= f.submit %>
        </td>
    </tr>
</table>


<% end %>

在创建新订单时的表单中没有显示任何内容。

id仅在我编辑order时出现。

Answer 1

创建后生成

id。它应该是数据库表中的主键，并且自动增加。在我的选项中，订单号应由系统生成，用户无法对其进行修改。

您可以添加after_create观察者来设置order_number

class Order < ActiveRecord::Base
  after_create :set_order_number
  def set_order_number
    self.update_attribute('order_number', self.id)
  end
end