Setting the initial value for a field on an inline with Django admin

admin.py

"""
This examples shows setting the current user as the default value for a field named 'user'
"""
class MyInline(admin.TabularInline):

    def formfield_for_dbfield(self, db_field, request, **kwargs):
        field = super().formfield_for_dbfield(db_field, request, **kwargs)
        if db_field.name == 'user':
            field.initial = request.user
        return field