How to automatically indicate the author of the entry?

Question

Django

There is a model:

class Request(models.Model):
    **        
    usercreated = models.ForeignKey(User, blank=True, null=True)

How can I specify that the usercreated field be filled in the database automatically after (before) saving the record. The ID of the current user. I did it with the help of a signal, but it didn’t work out, because request cannot be found.
The project is only in the administrative interface, without cbv

Answer 1

Here is the solution that helped me. Thanks to all!

def save_formset(self, request, form, formset, change):
        instances = formset.save(commit=False)
        for instance in instances:
            if isinstance(instance, Request):
                if(not instance.usercreated):
                    instance.usercreated = request.user          
                instance.save()

Answer 2

You can catch the user in the middleware and then get him from there when saving

Answer 3

In my projects for a long time I did this:
1. Model with all common fields for audit:

models.py
class Audit(models.Model):
    """
    A common class for auditing the models' instances.
    """
    created_by = models.ForeignKey(
        User,
        related_name='%(app_label)s_%(class)s_created_related',
        verbose_name=_(u'Создал'),
        on_delete=models.SET_NULL,
        blank=True, null=True)
    changed_by = models.ForeignKey(
        User,
        related_name='%(app_label)s_%(class)s_changed_related',
        verbose_name=_(u'Изменил'),
        on_delete=models.SET_NULL,
        blank=True, null=True)
    created = models.DateTimeField(
        _(u'Дата создания'), auto_now_add=True)
    changed = models.DateTimeField(
        _(u'Дата изменения'), auto_now=True)
    class Meta:
        abstract = True

2. For admin panel:

admin.py
class AuditAdmin(admin.ModelAdmin):
    """
    Admin class for audit fields
    """
    readonly_fields = (
        'created_by',
        'changed_by',
        'created',
        'changed')

    fieldsets_preset = (
        _(u'Прочее'), {
            'fields': (
                'created_by',
                'created',
                'changed_by',
                'changed'
            )
        })
    actions_on_top = True

    def save_model(self, request, obj, form, change):
        if not change:
            obj.created_by = request.user
        obj.changed_by = request.user
        obj.save()

We inherit all models and admin classes for which it is necessary to monitor users, and rejoice.
This solution ceased to satisfy me as soon as there were too many models - the list of related relations for the User class became simply unbearable. I'm working on the transition to storing the user's login in text form instead of a foreign key per user.