Create a function which fill automatically a field in my models

[Anselme SERI]

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

[Motaz Hejaze]

Yes you can make a normal charfield and assign its default attribute to a function you declare

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[Anselme SERI]

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.

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[Derek]

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 <trap...@gmail.com> 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, <anselme...@gmail.com> 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

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[Phako Perez]

You can use default option while creating model

Sent from my iPhone

On 7 May 2020, at 8:53, Derek <game...@gmail.com> wrote:



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