fix pattern lookups on non-string fields

Author: WaVEV

django_mongodb/features.py

@@ -41,10 +41,6 @@ class DatabaseFeatures(BaseDatabaseFeatures):
         # tuple index out of range in process_rhs()
         "lookup.tests.LookupTests.test_exact_sliced_queryset_limit_one",
         "lookup.tests.LookupTests.test_exact_sliced_queryset_limit_one_offset",
-        # Regex lookup doesn't work on non-string fields.
-        "lookup.tests.LookupTests.test_regex_non_string",
-        # Querying ObjectID with string doesn't work.
-        "lookup.tests.LookupTests.test_lookup_int_as_str",
         # MongoDB gives the wrong result of log(number, base) when base is a
         # fractional Decimal: https://jira.mongodb.org/browse/SERVER-91223
         "db_functions.math.test_log.LogTests.test_decimal",

django_mongodb/query_utils.py

@@ -40,4 +40,4 @@ def process_rhs(node, compiler, connection):
 def regex_match(field, regex_vals, insensitive=False):
     regex = {"$concat": regex_vals} if isinstance(regex_vals, tuple) else regex_vals
     options = "i" if insensitive else ""
-    return {"$regexMatch": {"input": field, "regex": regex, "options": options}}
+    return {"$regexMatch": {"input": {"$toString": field}, "regex": regex, "options": options}}