如何枚举新列? [英] How to enumerate new column?

问题描述

在我的Django管理员中，我有一个 TabularInLine 类.在图片中，此类的每个元素都用其自己的 ID 进行编号.该 TabularInLine 类具有另一个类(类 Part )的外键.我怎样才能为每个 FK 的编号( my_id )从1开始编号，如下图所示?

In my Django admin I have a TabularInLine class. In the picture, each element of this class is numbered with it's own ID. This TabularInLine class has a foreign key to an other class (class Part). How I can to numerate that for each FK with the numbering (my_id) started from 1 as in the picture below?

推荐答案

，您可以定义自己的 insert 操作，该操作将执行以下步骤:

you can define your own insert operation which does those steps:

• 使用新条目的外键查询数据库
• 获取结果计数
• 分配my_id = count + 1

假设您的数据库中已经有该表.您要向数据库添加一个新条目，该条目具有 FK ="three" .

let's say you already have that table in your database. you want to add a new entry to database, which has FK="three".

• 查询数据库中的对象( FK ="three" ).
• 结果数为2.(最后两行)
• 分配my_id = 3

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