fix enum lookup

Author: timgraham

django_mongodb/features.py

@@ -85,9 +85,6 @@ class DatabaseFeatures(BaseDatabaseFeatures):
         # contains with expressions/subqueries doesn't work.
         "model_fields_.test_arrayfield.TestQuerying.test_contains_including_expression",
         "model_fields_.test_arrayfield.TestQuerying.test_contains_subquery",
-        # Add FieldGetDbPrepValueMixin to lookups?
-        # https://github.com/django/django/commit/5a36c81f58b8ff45d8dac052343722c54e3fa521#diff-10cd50a6d8761600a1aea96d413184582481a278388b4ad38a788030a21cbd45R5
-        "model_fields_.test_arrayfield.TestQuerying.test_enum_lookup",
         # Unsupported conversion from array to string in $convert
         "model_fields_.test_arrayfield.TestQuerying.test_icontains",
         # Field 'field' expected a number but got Value(1).

django_mongodb/fields/array.py

@@ -4,7 +4,7 @@
 from django.core import checks, exceptions
 from django.db.models import DecimalField, Field, Func, IntegerField, Transform, Value
 from django.db.models.fields.mixins import CheckFieldDefaultMixin
-from django.db.models.lookups import In, Lookup
+from django.db.models.lookups import FieldGetDbPrepValueMixin, In, Lookup
 from django.utils.translation import gettext_lazy as _
 
 from django_mongodb.forms import SimpleArrayField
@@ -267,7 +267,7 @@ def _rhs_not_none_values(self, rhs):
 
 
 @ArrayField.register_lookup
-class ArrayContains(Lookup):  # ArrayRHSMixin, lookups.DataContains):
+class ArrayContains(FieldGetDbPrepValueMixin, Lookup):
     lookup_name = "contains"
 
     def as_mql(self, compiler, connection):