从Django管理员中减去两个字段 [英] subtract two fields from django admin

问题描述

如何从django admin中减去两个字段值.在这里，我发表了自己的看法和圣旨

How do i subtract the two field values from django admin. here i gave my views and templtaes

views.py

for attendancesheet_info in attendance_sheet:
 attendancesheet_info.present_days= attendancesheet_info.working_days - attendancesheet_info.leave_days

模板

   </tr>
                  <tr>
                    {% for attendancesheet_info in attendance_sheet %}
                    <tr>
                    <td>{{ attendancesheet_info.id}}</td>
                    <td>{{ attendancesheet_info.employeeid}}</td>
                    <td>{{ attendancesheet_info.employeename}}</td>
                    <td>{{ attendancesheet_info.working_days}}</td>
                    <td>{{ attendancesheet_info.leave_days}}</td>
                    <td>{{ attendancesheet_info.permissions}}</td>
                    <td>{{ attendancesheet_info.present_days}}</td>
                    </tr>
                     {% endfor %}


                  </tr>

推荐答案

您可以在模型的类方法中对其进行计算，并在admin的编辑视图或列表视图中以只读字段的形式在admin中引用该方法..py.

You can calculate it in a class method in the model and reference that method in the admin as a read-only field in an edit view or list view in admin.py.

# this method goes into your model.
@property
def present_days(self):
    return self.working_days - self.leave_days

您的示例模板也将起作用.您无需在视图中执行任何操作即可访问 present_days .不需要来自views.py的问题代码.

Your example template will also work. You don't need to do anything in the view to access present_days. The code in your question from views.py is not needed.

<td>{{ attendancesheet_info.present_days}}</td>

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