Re: function model which generate a code for model field

When I test the function you offer 'self.id' returns 'None'

Le mer. 27 mai 2020 à 13:09, Akinfolarin Stephen <akinfolarinstephen8@gmail.com> a écrit :

i feel in your last session you are trying to concatenate a string and an integer use the int function to convert it to string then the number will show

On Monday, May 25, 2020 at 5:48:29 AM UTC+14, Anselme SERI wrote:

from django.db import models


def codeid():
    lastid = MyModel.objects.last(id)
    autocode = ''
    if lastid == 0:
        autocode = 'BAC000000001'
    elif lastid != 0:
        if len(lastid) <= 8:
            lastid += 1
            autocode = 'D/BAC/00000000' + lastid
        elif 9 < len(lastid) <= 98:
            lastid += 1
            autocode = 'D/BAC/0000000' + lastid
        elif 99 < len(lastid) <= 998:
            lastid += 1
            autocode = 'D/BAC/000000' + lastid
    return autocode


class MyModel(models.Model):
    libelle = models.CharField('Libellé', max_length=100)
    code = models.CharField(max_length=30, unique=True, auto_created=codeid())

    def __str__(self):
        return self.code

Hello,

I try  to to write a correct function for my model which  generate a str + incremental number according last id model.

Pleaz help me.

 

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