[Answer]-Default django model filed with value from the immediatelly previous entry

by

1👍

✅

Do not specify the default value in this case. The best place to do that is in the model form save method:

class TimeLogForm(forms.ModelForm):
    class Meta:
        exclude = ['begin_sec']
        model = TimeLog

    def __init__(self, *args, **kw):
        super(TimeLogForm).__init__(self, *args, **kw)

    def save(self, *args, **kw):
        instance = super(TimeLogForm, self).save(commit=False)
        last_entry = TimeLog.objects.all().order_by('-id')[0]
        if last_entry:
            instance.begin_sec = last_entry.begin_sec
        else:
            # this is the very first record do something
            pass
        instance.save()
        return instance

Also you don’t need to set auto_now=False and auto_now_add=False for both fields, by default they are False.

👤Aamir Rind

Leave a comment