Fix test for unencrypted field not in field map

Author: aclark4life

django_mongodb_backend/base.py

@@ -160,6 +160,7 @@ def __init__(self, settings_dict, alias=DEFAULT_DB_ALIAS):
         # Cache the `settings_dict` in case we need to check for
         # auto_encryption_opts later.
         self.__dict__["_settings_dict"] = copy.deepcopy(settings_dict)
+        self.encrypted_connection = None
 
     def get_collection(self, name, **kwargs):
         collection = Collection(self.database, name, **kwargs)

django_mongodb_backend/schema.py

@@ -447,16 +447,17 @@ def _create_collection(self, model):
             auto_encryption_opts = self.connection._settings_dict.get("OPTIONS", {}).get(
                 "auto_encryption_opts"
             )
-            # Use the cached settings dict to create a new connection
-            encrypted_connection = self.connection.get_new_connection(
-                self.connection._settings_dict
-            )
+            if not self.connection.encrypted_connection:
+                # Use the cached settings dict to create a new connection
+                self.encrypted_connection = self.connection.get_new_connection(
+                    self.connection._settings_dict
+                )
             # Use the encrypted connection and auto_encryption_opts to create an encrypted client
-            encrypted_client = get_encrypted_client(auto_encryption_opts, encrypted_connection)
+            encrypted_client = get_encrypted_client(auto_encryption_opts, self.encrypted_connection)
 
             with contextlib.suppress(EncryptedCollectionError):
                 encrypted_client.create_encrypted_collection(
-                    encrypted_connection[self.connection.database.name],
+                    self.encrypted_connection[self.connection.database.name],
                     model._meta.db_table,
                     model.encrypted_fields_map,
                     "local",  # TODO: KMS provider should be configurable