django: check if given lookup string is valid for given model

is_valid_lookup_field_for_model.py

from django.db.models.constants import LOOKUP_SEP
from django.core.exceptions import FieldDoesNotExist

# django: check if given lookup string is valid for given model

def is_valid_lookup_field(model, lookup):
    # will return first non relational field's verbose_name in lookup
    for part in lookup.split(LOOKUP_SEP):
        print(part)
        try:
            f = model._meta.get_field(part)
        except FieldDoesNotExist:
            # check if field is related
            for f in model._meta.related_objects:
                if f.get_accessor_name() == part:
                    break
            else:
                return False
        if f.is_relation:
            model = f.related_model
            continue
        return True
    return False