Fixed issue https://github.com/carrotquest/django-clickhouse/issues/4

src/django_clickhouse/compatibility.py

@@ -1,5 +1,9 @@
 import sys
 from collections import namedtuple as basenamedtuple
+from typing import Any, Set
+
+from django.db import transaction, connections
+from django.db.models import QuerySet
 
 
 def namedtuple(*args, **kwargs):
@@ -16,3 +20,36 @@ def namedtuple(*args, **kwargs):
         return TupleClass
     else:
         return basenamedtuple(*args, **kwargs)
+
+
+def django_pg_returning_available(using: str) -> bool:
+    """
+    Checks if django-pg-returning library is installed and can be used with given databse
+    :return: Boolean
+    """
+    try:
+        import django_pg_returning
+        return connections[using].vendor == 'postgresql'
+    except ImportError:
+        return False
+
+
+def update_returning_pk(qs: QuerySet, updates: dict) -> Set[Any]:
+    """
+    Updates QuerySet items returning primary key values.
+    This method should not depend on database engine, though can have optimization performances for some engines.
+    :param qs: QuerySet to update
+    :param updates: Update items as passed to QuerySet.update(**updates) method
+    :return: A set of primary keys
+    """
+    qs._for_write = True
+    if django_pg_returning_available(qs.db):
+        pk_name = qs.model._meta.pk.name
+        qs = qs.only(pk_name).update_returning(**updates)
+        pks = set(qs.values_list(pk_name, flat=True))
+    else:
+        with transaction.atomic(using=qs.db):
+            pks = set(qs.select_for_update().values_list('pk', flat=True))
+            QuerySet.update(qs, **updates)
+
+    return pks

src/django_clickhouse/models.py

@@ -13,6 +13,7 @@ from django.db.models.signals import post_save, post_delete
 from django.dispatch import receiver
 from statsd.defaults.django import statsd
 
+from .compatibility import update_returning_pk
 from .configuration import config
 from .storages import Storage
 from .utils import lazy_class_import
@@ -32,9 +33,9 @@ except ImportError:
 
 
 class ClickHouseSyncRegisterMixin:
-    def _register_ops(self, operation, result):
+    def _register_ops(self, operation, result, as_int: bool = False):
         pk_name = self.model._meta.pk.name
-        pk_list = [getattr(item, pk_name) for item in result]
+        pk_list = [getattr(item, pk_name) if isinstance(item, DjangoModel) else item for item in result]
         self.model.register_clickhouse_operations(operation, *pk_list, using=self.db)
 
 
@@ -87,12 +88,9 @@ class ClickHouseSyncBulkUpdateQuerySetMixin(ClickHouseSyncRegisterMixin, BulkUpd
 
 class ClickHouseSyncQuerySetMixin(ClickHouseSyncRegisterMixin):
     def update(self, **kwargs):
-        # BUG I use update_returning method here. But it is not suitable for databases other then PostgreSQL
+        pks = update_returning_pk(self, kwargs)
-        # and requires django-pg-update-returning installed
+        self._register_ops('update', pks)
-        pk_name = self.model._meta.pk.name
+        return len(pks)
-        res = self.only(pk_name).update_returning(**kwargs)
-        self._register_ops('update', res)
-        return len(res)
 
     def bulk_create(self, objs, batch_size=None):
         objs = super().bulk_create(objs, batch_size=batch_size)
@@ -168,7 +166,7 @@ class ClickHouseSyncModel(DjangoModel):
         :param using: Database alias registered instances are from
         :return: None
         """
-        model_pks = ['%s.%d' % (using or config.DEFAULT_DB_ALIAS, pk) for pk in model_pks]
+        model_pks = ['%s.%s' % (using or config.DEFAULT_DB_ALIAS, pk) for pk in model_pks]
 
         def _on_commit():
             for model_cls in cls.get_clickhouse_sync_models():