You can use default option while creating model Sent from my iPhone
> On 7 May 2020, at 8:53, Derek <[email protected]> wrote: > > > Its unclear what you mean by "last ID" - and I cannot see the value of > storing such as they are available in the database... > > But have a look at > https://stackoverflow.com/questions/12649659/how-to-set-a-django-model-fields-default-value-to-a-function-call-callable-e > > > The example is: > > from datetime import datetime, timedelta > > # default to 1 day from now > def get_default_my_date(): > return datetime.now() + timedelta(days=1) > > class MyModel(models.Model): > my_date = models.DateTimeField(default=get_default_my_date) > > > Instead of the date arithmetic, you'd need to write code to, for example, > extract last ID from the database (assuming you have an auto-increment ID > set) and do the concatenation. > > > > >> On Thursday, 7 May 2020 02:23:22 UTC+2, Anselme SERI wrote: >> Thanks you for your answer. I know how to make a default value in charfield >> but I don't know how to build function which returns value for my default >> field. In my case this function must retrieve last id on my model and must >> concataned it with a string and the final result must be affected to default >> charfield. Have you an example ? Help me plz. >> >>> Le mer. 6 mai 2020 à 18:44, Motaz Hejaze <[email protected]> a écrit : >>> Yes you can make a normal charfield and assign its default attribute to a >>> function you declare >>> >>>> On Wed, 6 May 2020, 6:53 pm Anselme SERI, <[email protected]> wrote: >>>> Hi, >>>> >>>> I use Django 3.0 and I would like to create a function which fill >>>> automatically a field in my models. >>>> Can I do it directly in models.py ? How? >>>> >>>> Thanks a lot >>>> >>>> -- >>>> You received this message because you are subscribed to the Google Groups >>>> "Django users" group. >>>> To unsubscribe from this group and stop receiving emails from it, send an >>>> email to [email protected]. >>>> To view this discussion on the web visit >>>> https://groups.google.com/d/msgid/django-users/5f810453-c7ca-4c10-bca1-4cfe11ea496a%40googlegroups.com. >>> >>> -- >>> You received this message because you are subscribed to the Google Groups >>> "Django users" group. >>> To unsubscribe from this group and stop receiving emails from it, send an >>> email to [email protected]. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/django-users/CAHV4E-dDRD%3DLteuDo7KuATzjKem-ThvtozzHuaqkwAeAC%2BBrZw%40mail.gmail.com. > > -- > You received this message because you are subscribed to the Google Groups > "Django users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/django-users/48c4d59e-8241-4739-b8df-feab45a7fa3a%40googlegroups.com. -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/B80CE7F3-311A-4F57-8DB0-9B80997DEAC4%40gmail.com.
