如何枚举新列？

Question

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?

Answer 1

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

• query database with your new entry's foreign key
• get count of results
• assign my_id=count+1

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

• query DB for objects( FK="three" ).
• count of results is 2. (the last two rows)
• assign my_id=3