How to abstract a random data getter for Django?

i have a piece of code to get random data from database:

def get_random_item(model,queryset,id_column_name): 
    max_id = getattr(model.objects.order_by('-%s'%id_column_name)[0],id_column_name)
    min_id = math.ceil((max_id-100000)*random.random()) + 100000
    return queryset.filter(**content_id**__gte=min_id)[0]

as u can see,i want to abstract a function for any model,but i don't know how to replace the "content_id",cauz it's not a string or simply an attribute but开发者_开发技巧 with __gte.

tks for your answers~

"The pk lookup shortcut"

For convenience, Django provides a pk lookup shortcut, which stands for "primary key".

You can try queryset.filter(**{"%s__gte" % (column_name,): min_id)

You can read more about it here