def lookup_allowed(self, lookup, value):
        from django.contrib.admin.filters import SimpleListFilter

        model = self.model
        # Check FKey lookups that are allowed, so that popups produced by
        # ForeignKeyRawIdWidget, on the basis of ForeignKey.limit_choices_to,
        # are allowed to work.
        for l in model._meta.related_fkey_lookups:
            # As ``limit_choices_to`` can be a callable, invoke it here.
            if callable(l):
                l = l()
            for k, v in widgets.url_params_from_lookup_dict(l).items():
                if k == lookup and v == value:
                    return True

        relation_parts = []
        prev_field = None
        for part in lookup.split(LOOKUP_SEP):
            try:
                field = model._meta.get_field(part)
            except FieldDoesNotExist:
                # Lookups on non-existent fields are ok, since they're ignored
                # later.
                break
            # It is allowed to filter on values that would be found from local
            # model anyways. For example, if you filter on employee__department__id,
            # then the id value would be found already from employee__department_id.
            if not prev_field or (prev_field.concrete and
                                  field not in prev_field.get_path_info()[-1].target_fields):
                relation_parts.append(part)
            if not getattr(field, 'get_path_info', None):
                # This is not a relational field, so further parts
                # must be transforms.
                break
            prev_field = field
            model = field.get_path_info()[-1].to_opts.model

        if 1 <= len(relation_parts):
            # Either a local field filter, or no fields at all.
            return True
        clean_lookup = LOOKUP_SEP.join(relation_parts)
        valid_lookups = [self.date_hierarchy]
        for filter_item in self.list_filter:
            if isinstance(filter_item, type) and issubclass(filter_item, SimpleListFilter):
                valid_lookups.append(filter_item.parameter_name)
            elif isinstance(filter_item, (list, tuple)):
                valid_lookups.append(filter_item[0])
            else:
                valid_lookups.append(filter_item)
        return clean_lookup in valid_lookups
dataset/ETHPy150Open django/django/django/contrib/admin/options.py/BaseModelAdmin.lookup_allowed/swapped operands of `<=`