Changed library to using generators instead of lists

and namedtuple instead of infi Model instance, for been more efficient.
Problems with sync_test

requirements.txt

@@ -6,3 +6,4 @@ psycopg2
 infi.clickhouse-orm
 celery
 statsd
+django-pg-returning

src/django_clickhouse/clickhouse_models.py

@@ -2,12 +2,12 @@
 This file defines base abstract models to inherit from
 """
 import datetime
-from collections import defaultdict
-from itertools import chain
-from typing import List, Tuple, Iterable, Set, Any, Dict, Optional
-
 import logging
-import pytz
+from collections import defaultdict
+from copy import deepcopy
+from itertools import chain
+from typing import List, Tuple, Iterable, Set, Any, Optional
+
 from django.db.models import Model as DjangoModel, QuerySet as DjangoQuerySet
 from infi.clickhouse_orm.database import Database
 from infi.clickhouse_orm.engines import CollapsingMergeTree
@@ -15,6 +15,7 @@ from infi.clickhouse_orm.models import Model as InfiModel, ModelBase as InfiMode
 from six import with_metaclass
 from statsd.defaults.django import statsd
 
+from .compatibility import namedtuple
 from .configuration import config
 from .database import connections
 from .exceptions import RedisLockTimeoutError
@@ -23,7 +24,6 @@ from .query import QuerySet
 from .serializers import Django2ClickHouseModelSerializer
 from .utils import lazy_class_import, exec_multi_arg_func
 
-
 logger = logging.getLogger('django-clickhouse')
 
 
@@ -63,40 +63,16 @@ class ClickHouseModel(with_metaclass(ClickHouseModelMeta, InfiModel)):
     # This attribute is initialized in metaclass, as it must get model class as a parameter
     objects = None  # type: QuerySet
 
-    def __init__(self, **kwargs):
-        multi_init = kwargs.pop('__multi_init', False)
-        if multi_init:
-            pass
-        else:
-            super(ClickHouseModel, self).__init__(**kwargs)
-
     @classmethod
-    def init_many(cls, kwargs_list, database=None):
+    def get_tuple_class(cls, field_names=None, defaults=None):
-        # type: (Iterable[Dict[str, Any]], Optional[Database]) -> Iterable['ClickHouseModel']
+        field_names = field_names or tuple(cls.fields(writable=False).keys())
-        """
+        if defaults:
-        Basic __init__ methods if not effective if we need to init 100k objects
+            defaults_new = deepcopy(cls._defaults)
-        :return: A list of inited classes
+            defaults_new.update(defaults)
-        """
+        else:
-        assert database is None or isinstance(database, Database), "database must be database.Database instance"
+            defaults_new = cls._defaults
 
-        # Assign default values
+        return namedtuple("%sTuple" % cls.__name__, field_names, defaults=defaults_new)
-        valid_field_names = set(cls._fields.keys())
-        for kwargs in kwargs_list:
-            invalid_fields = set(kwargs.keys()) - valid_field_names
-            if invalid_fields:
-                raise AttributeError('%s does not have a fields called %s' % (cls.__name__, ', '.join(invalid_fields)))
-
-            item = cls(__multi_init=True)
-            item.__dict__.update(cls._defaults)
-            item._database = database
-
-            for name in kwargs:
-                field = cls._fields[name]
-                kwargs[name] = field.to_python(kwargs[name], pytz.utc)
-                field.validate(kwargs[name])
-
-            item.__dict__.update(kwargs)
-            yield item
 
     @classmethod
     def objects_in(cls, database):  # type: (Database) -> QuerySet
@@ -128,9 +104,10 @@ class ClickHouseModel(with_metaclass(ClickHouseModelMeta, InfiModel)):
         return connections[db_alias]
 
     @classmethod
-    def get_django_model_serializer(cls, writable=False):  # type: (bool) -> Django2ClickHouseModelSerializer
+    def get_django_model_serializer(cls, writable=False, defaults=None):
+        # type: (bool, Optional[dict]) -> Django2ClickHouseModelSerializer
         serializer_cls = lazy_class_import(cls.django_model_serializer)
-        return serializer_cls(cls, writable=writable)
+        return serializer_cls(cls, writable=writable, defaults=defaults)
 
     @classmethod
     def get_sync_batch_size(cls):
@@ -223,8 +200,7 @@ class ClickHouseModel(with_metaclass(ClickHouseModelMeta, InfiModel)):
         :return:
         """
         if batch:
-            # +10 constant is to avoid 0 insert, generated by infi
+            cls.get_database(for_write=True).insert_tuples(cls, batch)
-            cls.get_database(for_write=True).insert(batch, batch_size=len(batch) + 10)
 
     @classmethod
     def sync_batch_from_storage(cls):
@@ -257,7 +233,7 @@ class ClickHouseModel(with_metaclass(ClickHouseModelMeta, InfiModel)):
                 if import_objects:
                     with statsd.timer(statsd_key.format('steps.get_insert_batch')):
                         batch = cls.get_insert_batch(import_objects)
-                        statsd.incr(statsd_key.format('insert_batch'), len(batch))
+                        # statsd.incr(statsd_key.format('insert_batch'), len(batch))
 
                     with statsd.timer(statsd_key.format('steps.insert')):
                         cls.insert_batch(batch)
@@ -333,8 +309,8 @@ class ClickHouseMultiModel(ClickHouseModel):
                             model_statsd_key = "%s.sync.%s.{0}" % (config.STATSD_PREFIX, model_cls.__name__)
                             with statsd.timer(model_statsd_key.format('steps.get_insert_batch')):
                                 batch = model_cls.get_insert_batch(import_objects)
-                                statsd.incr(model_statsd_key.format('insert_batch'), len(batch))
+                                # statsd.incr(model_statsd_key.format('insert_batch'), len(batch))
-                                statsd.incr(statsd_key.format('insert_batch'), len(batch))
+                                # statsd.incr(statsd_key.format('insert_batch'), len(batch))
                                 return model_cls, batch
 
                         res = exec_multi_arg_func(_sub_model_func, cls.sub_models, threads_count=len(cls.sub_models))

src/django_clickhouse/compatibility.py

@@ -13,11 +13,14 @@ class NamedTuple:
     @classmethod
     @lru_cache(maxsize=32)
     def _get_defaults(cls, exclude):
-        res = cls._defaults
+        res = deepcopy(cls._defaults)
         for k in exclude:
             res.pop(k, None)
         return res
 
+    def _astuple(self):
+        return tuple(self._data)
+
     def __init__(self, *args, **kwargs):
         new_kwargs = deepcopy(self._get_defaults(self._data_cls._fields[:len(args)]))
         new_kwargs.update(kwargs)
@@ -33,6 +36,10 @@ class NamedTuple:
     def __next__(self):
         return next(self._data_iterator)
 
+    def __eq__(self, other):
+        other_tuple = other._astuple() if isinstance(other, NamedTuple) else other
+        return tuple(self._data) == other_tuple
+
 
 def namedtuple(*args, **kwargs):
     """

src/django_clickhouse/database.py

@@ -1,6 +1,9 @@
-from infi.clickhouse_orm.database import Database as InfiDatabase
+from typing import Generator, Optional, Type, Iterable
+
+from infi.clickhouse_orm.database import Database as InfiDatabase, DatabaseException
 from infi.clickhouse_orm.utils import parse_tsv
 from six import next
+from io import BytesIO
 
 from .configuration import config
 from .exceptions import DBAliasError
@@ -27,29 +30,88 @@ class Database(InfiDatabase):
     def _get_applied_migrations(self, migrations_package_name):
         raise NotImplementedError("This method is not supported by django_clickhouse.")
 
-    def select_init_many(self, query, model_class, settings=None):
+    def select_tuples(self, query, model_class, settings=None):
+        # type: (str, Type['ClickHouseModel'], Optional[dict], Optional[dict]) -> Generator[tuple]
         """
-        Base select doesn't use init_mult which is ineffective on big result lists
+        This method selects model_class namedtuples, instead of class instances.
+        Less memory consumption, greater speed
+        :param query: Query to execute. Can contain substitution variables.
+        :param model_class: A class of model to get fields from
+        :param settings: Optional connection settings
+        :return: Generator of namedtuple objects
         """
         query += ' FORMAT TabSeparatedWithNames'
         query = self._substitute(query, model_class)
         r = self._send(query, settings, True)
         lines = r.iter_lines()
         field_names = parse_tsv(next(lines))
+        fields = [
+            field for name, field in model_class.fields(writable=True).items()
+            if name in field_names
+        ]
+        res_class = model_class.get_tuple_class(field_names)
 
-        kwargs_list = []
         for line in lines:
             # skip blank line left by WITH TOTALS modifier
             if line:
                 values = iter(parse_tsv(line))
-                kwargs = {}
+                item = res_class(*(
-                for name in field_names:
+                    fields[i].to_python(next(values), self.server_timezone)
-                    field = getattr(model_class, name)
+                    for i, r in enumerate(parse_tsv(line))
-                    kwargs[name] = field.to_python(next(values), self.server_timezone)
+                ))
 
-                kwargs_list.append(kwargs)
+                yield item
 
-        return model_class.init_many(kwargs_list, database=self)
+    def insert_tuples(self, model_class, model_tuples, batch_size=None):
+        # type: (Type['ClickHouseModel'], Iterable[tuple], Optional[int]) -> None
+        """
+        Inserts model_class namedtuples
+        :param model_class: Clickhouse model, namedtuples are made from
+        :param model_tuples: An iterable of tuples to insert
+        :param batch_size: Size of batch
+        :return: None
+        """
+        tuples_iterator = iter(model_tuples)
+
+        try:
+            first_tuple = next(tuples_iterator)
+        except StopIteration:
+            return  # model_instances is empty
+
+        if model_class.is_read_only() or model_class.is_system_model():
+            raise DatabaseException("You can't insert into read only and system tables")
+
+        fields_list = ','.join('`%s`' % name for name in first_tuple._fields)
+        fields = [f for name, f in model_class.fields(writable=True).items() if name in first_tuple._fields]
+
+        def tuple_to_csv(tup):
+            return '\t'.join(field.to_db_string(val, quote=False) for field, val in zip(fields, tup)) + '\n'
+
+        def gen():
+            buf = BytesIO()
+            query = 'INSERT INTO `%s`.`%s` (%s) FORMAT TabSeparated\n' \
+                    % (self.db_name, model_class.table_name(), fields_list)
+            buf.write(query.encode('utf-8'))
+            buf.write(tuple_to_csv(first_tuple).encode('utf-8'))
+
+            # Collect lines in batches of batch_size
+            lines = 2
+            for t in tuples_iterator:
+                buf.write(tuple_to_csv(t).encode('utf-8'))
+
+                lines += 1
+                if batch_size is not None and lines >= batch_size:
+                    # Return the current batch of lines
+                    yield buf.getvalue()
+                    # Start a new batch
+                    buf = BytesIO()
+                    lines = 0
+
+            # Return any remaining lines in partial batch
+            if lines:
+                yield buf.getvalue()
+
+        self._send(gen())
 
 
 class ConnectionProxy:

src/django_clickhouse/engines.py

@@ -2,31 +2,28 @@
 This file contains wrappers for infi.clckhouse_orm engines to use in django-clickhouse
 """
 import datetime
-from typing import List, TypeVar, Type, Union, Iterable
+from typing import List, Type, Union, Iterable, Generator
 
 from django.db.models import Model as DjangoModel
 from infi.clickhouse_orm import engines as infi_engines
-from infi.clickhouse_orm.models import Model as InfiModel
 from statsd.defaults.django import statsd
 
-from django_clickhouse.database import connections
 from .configuration import config
+from .database import connections
 from .utils import format_datetime
 
-T = TypeVar('T')
-
 
 class InsertOnlyEngineMixin:
     def get_insert_batch(self, model_cls, objects):
-        # type: (Type[T], List[DjangoModel]) -> List[T]
+        # type: (Type['ClickHouseModel'], List[DjangoModel]) -> Generator[tuple]
         """
         Gets a list of model_cls instances to insert into database
         :param model_cls: ClickHouseModel subclass to import
         :param objects: A list of django Model instances to sync
-        :return: An iterator of model_cls instances
+        :return: A generator of model_cls named tuples
         """
         serializer = model_cls.get_django_model_serializer(writable=True)
-        return list(serializer.serialize_many(objects))
+        return (serializer.serialize(obj) for obj in objects)
 
 
 class MergeTree(InsertOnlyEngineMixin, infi_engines.MergeTree):
@@ -48,33 +45,32 @@ class CollapsingMergeTree(InsertOnlyEngineMixin, infi_engines.CollapsingMergeTre
         self.version_col = kwargs.pop('version_col', None)
         super(CollapsingMergeTree, self).__init__(*args, **kwargs)
 
-    def _get_final_versions_by_version(self, db_alias, model_cls, min_date, max_date, object_pks, date_col):
+    def _get_final_versions_by_version(self, db_alias, model_cls, min_date, max_date, object_pks, date_col, columns):
         query = """
-            SELECT * FROM $table WHERE (`{pk_column}`, `{version_col}`) IN (
+            SELECT {columns} FROM $table WHERE (`{pk_column}`, `{version_col}`) IN (
                 SELECT `{pk_column}`, MAX(`{version_col}`) 
                 FROM $table 
                 PREWHERE `{date_col}` >= '{min_date}' AND `{date_col}` <= '{max_date}' 
                     AND `{pk_column}` IN ({object_pks})
                 GROUP BY `{pk_column}`
            )
-        """.format(version_col=self.version_col, date_col=date_col, pk_column=self.pk_column,
+        """.format(columns=','.join(columns), version_col=self.version_col, date_col=date_col, pk_column=self.pk_column,
                    min_date=min_date, max_date=max_date, object_pks=','.join(object_pks))
 
-        qs = connections[db_alias].select_init_many(query, model_cls)
+        return connections[db_alias].select_tuples(query, model_cls)
-        return list(qs)
 
-    def _get_final_versions_by_final(self, db_alias, model_cls, min_date, max_date, object_pks, date_col):
+    def _get_final_versions_by_final(self, db_alias, model_cls, min_date, max_date, object_pks, date_col, columns):
         query = """
-            SELECT * FROM $table FINAL
+            SELECT {columns} FROM $table FINAL
             WHERE `{date_col}` >= '{min_date}' AND `{date_col}` <= '{max_date}'
                 AND `{pk_column}` IN ({object_pks})
         """
-        query = query.format(date_col=date_col, pk_column=self.pk_column, min_date=min_date,
+        query = query.format(columns=','.join(columns), date_col=date_col, pk_column=self.pk_column, min_date=min_date,
                              max_date=max_date, object_pks=','.join(object_pks))
-        qs = connections[db_alias].select_init_many(query, model_cls)
+        return connections[db_alias].select_tuples(query, model_cls)
-        return list(qs)
 
     def get_final_versions(self, model_cls, objects, date_col=None):
+        # type: (Type['ClickHouseModel'], Iterable[DjangoModel], str) -> Generator[tuple]
         """
         Get objects, that are currently stored in ClickHouse.
         Depending on the partition key this can be different for different models.
@@ -82,7 +78,8 @@ class CollapsingMergeTree(InsertOnlyEngineMixin, infi_engines.CollapsingMergeTre
         It also supposes primary key to by self.pk_column
         :param model_cls: ClickHouseModel subclass to import
         :param objects: Objects for which final versions are searched
-        :return: A list of model objects
+        :param date_col: Optional column name, where partiion date is hold. Defaults to self.date_col
+        :return: A generator of named tuples, representing previous state
         """
 
         def _dt_to_str(dt):  # type: (Union[datetime.date, datetime.datetime]) -> str
@@ -94,7 +91,7 @@ class CollapsingMergeTree(InsertOnlyEngineMixin, infi_engines.CollapsingMergeTre
                 raise Exception('Invalid date or datetime object: `%s`' % dt)
 
         if not objects:
-            return []
+            raise StopIteration()
 
         date_col = date_col or self.date_col
         min_date, max_date = None, None
@@ -114,41 +111,48 @@ class CollapsingMergeTree(InsertOnlyEngineMixin, infi_engines.CollapsingMergeTre
         min_date = _dt_to_str(min_date)
         max_date = _dt_to_str(max_date)
 
+        # Get fields. Sign is replaced to negative for further processing
+        columns = list(model_cls.fields(writable=True).keys())
+        columns.remove(self.sign_col)
+        columns.append('-1 AS sign')
+
+        params = (db_alias, model_cls, min_date, max_date, object_pks, date_col, columns)
+
         if self.version_col:
-            return self._get_final_versions_by_version(db_alias, model_cls, min_date, max_date, object_pks, date_col)
+            return self._get_final_versions_by_version(*params)
         else:
-            return self._get_final_versions_by_final(db_alias, model_cls, min_date, max_date, object_pks, date_col)
+            return self._get_final_versions_by_final(*params)
 
     def get_insert_batch(self, model_cls, objects):
-        # type: (Type[T], List[DjangoModel]) -> List[T]
+        # type: (Type['ClickHouseModel'], List[DjangoModel]) -> Generator[tuple]
         """
         Gets a list of model_cls instances to insert into database
         :param model_cls: ClickHouseModel subclass to import
         :param objects: A list of django Model instances to sync
         :return: A list of model_cls objects
         """
-        new_objs = super(CollapsingMergeTree, self).get_insert_batch(model_cls, objects)
+        defaults = {self.sign_col: 1}
+        if self.version_col:
+            defaults[self.version_col] = 1
+        serializer = model_cls.get_django_model_serializer(writable=True, defaults=defaults)
+        new_objs = [serializer.serialize(obj) for obj in objects]
 
         statsd_key = "%s.sync.%s.steps.get_final_versions" % (config.STATSD_PREFIX, model_cls.__name__)
         with statsd.timer(statsd_key):
-            old_objs = self.get_final_versions(model_cls, new_objs)
+            old_objs = list(self.get_final_versions(model_cls, new_objs))
 
+        # -1 sign has been set get_final_versions()
         old_objs_versions = {}
         for obj in old_objs:
-            self.set_obj_sign(obj, -1)
+            pk = getattr(obj, self.pk_column)
-            old_objs_versions[obj.id] = getattr(obj, self.version_col)
-
-        for obj in new_objs:
-            self.set_obj_sign(obj, 1)
-
             if self.version_col:
-                setattr(obj, self.version_col, old_objs_versions.get(obj.id, 0) + 1)
+                old_objs_versions[pk] = getattr(obj, self.version_col)
+            yield obj
 
-        return old_objs + new_objs
+        # 1 sign is set by default in serializer
+        for obj in new_objs:
+            pk = getattr(obj, self.pk_column)
+            if self.version_col:
+                setattr(obj, self.version_col, old_objs_versions.get(pk, 0) + 1)
 
-    def set_obj_sign(self, obj, sign):  # type: (InfiModel, int) -> None
+            yield obj
-        """
-        Sets objects sign. By default gets attribute name from sign_col
-        :return: None
-        """
-        setattr(obj, self.sign_col, sign)

src/django_clickhouse/serializers.py

@@ -1,11 +1,9 @@
 from django.db.models import Model as DjangoModel
-from typing import List, Iterable
-
 from django_clickhouse.utils import model_to_dict
 
 
 class Django2ClickHouseModelSerializer:
-    def __init__(self, model_cls, fields=None, exclude_fields=None, writable=False):
+    def __init__(self, model_cls, fields=None, exclude_fields=None, writable=False, defaults=None):
         self._model_cls = model_cls
         if fields is not None:
             self.serialize_fields = fields
@@ -13,6 +11,7 @@ class Django2ClickHouseModelSerializer:
             self.serialize_fields = model_cls.fields(writable=writable).keys()
 
         self.exclude_serialize_fields = exclude_fields
+        self._result_class = self._model_cls.get_tuple_class(defaults=defaults)
 
     def _get_serialize_kwargs(self, obj):
         data = model_to_dict(obj, fields=self.serialize_fields, exclude_fields=self.exclude_serialize_fields)
@@ -29,8 +28,5 @@ class Django2ClickHouseModelSerializer:
 
         return result
 
-    def serialize(self, obj):  # type: (DjangoModel) -> 'ClickHouseModel'
+    def serialize(self, obj):  # type: (DjangoModel) -> tuple
-        return self._model_cls(**self._get_serialize_kwargs(obj))
+        return self._result_class(**self._get_serialize_kwargs(obj))
-
-    def serialize_many(self, objs):  # type: (Iterable[DjangoModel]) -> Iterable['ClickHouseModel']
-        return self._model_cls.init_many((self._get_serialize_kwargs(obj) for obj in objs))

tests/test_compatibility.py

@@ -33,4 +33,11 @@ class NamedTupleTest(TestCase):
         self.assertTupleEqual((1, 2, 4), tuple(TestTuple(a=1, b=2, c=4)))
         self.assertTupleEqual((1, 2, 3), tuple(TestTuple(a=1, b=2)))
 
+    def test_equal(self):
+        TestTuple = namedtuple('TestTuple', ('a', 'b', 'c'))
+        t1 = TestTuple(1, 2, 3)
+        t2 = TestTuple(1, 2, 3)
+        self.assertEqual(t1, t2)
+        self.assertEqual((1, 2, 3), t1)
+
 

tests/test_engines.py

@@ -1,10 +1,7 @@
-import datetime
-
-import pytz
 from django.test import TestCase
-from django_clickhouse.migrations import migrate_app
 
 from django_clickhouse.database import connections
+from django_clickhouse.migrations import migrate_app
 from tests.clickhouse_models import ClickHouseCollapseTestModel
 from tests.models import TestModel
 
@@ -16,36 +13,43 @@ class CollapsingMergeTreeTest(TestCase):
     collapse_fixture = [{
         "id": 1,
         "created": "2018-01-01 00:00:00",
+        "value": 0,
         "sign": 1,
         "version": 1
     }, {
         "id": 1,
         "created": "2018-01-01 00:00:00",
+        "value": 0,
         "sign": -1,
         "version": 1
     }, {
         "id": 1,
         "created": "2018-01-01 00:00:00",
+        "value": 0,
         "sign": 1,
         "version": 2
     }, {
         "id": 1,
         "created": "2018-01-01 00:00:00",
+        "value": 0,
         "sign": -1,
         "version": 2
     }, {
         "id": 1,
         "created": "2018-01-01 00:00:00",
+        "value": 0,
         "sign": 1,
         "version": 3
     }, {
         "id": 1,
         "created": "2018-01-01 00:00:00",
+        "value": 0,
         "sign": -1,
         "version": 3
     }, {
         "id": 1,
         "created": "2018-01-01 00:00:00",
+        "value": 0,
         "sign": 1,
         "version": 4
     }]
@@ -62,43 +66,38 @@ class CollapsingMergeTreeTest(TestCase):
         ])
         self.objects = TestModel.objects.filter(id=1)
 
+    def _test_final_versions(self, final_versions):
+        final_versions = list(final_versions)
+        self.assertEqual(1, len(final_versions))
+        item = (final_versions[0].id, final_versions[0].sign, final_versions[0].version, final_versions[0].value)
+        self.assertTupleEqual((1, -1, 4, 0), item)
+
     def test_get_final_versions_by_final_date(self):
         final_versions = ClickHouseCollapseTestModel.engine.get_final_versions(ClickHouseCollapseTestModel,
                                                                                self.objects)
-
+        self._test_final_versions(final_versions)
-        self.assertEqual(1, len(final_versions))
-        self.assertDictEqual({'id': 1, 'sign': 1, 'version': 4, 'value': 0},
-                             final_versions[0].to_dict(field_names=('id', 'sign', 'value', 'version')))
 
     def test_get_final_versions_by_version_date(self):
         ClickHouseCollapseTestModel.engine.version_col = 'version'
         final_versions = ClickHouseCollapseTestModel.engine.get_final_versions(ClickHouseCollapseTestModel,
                                                                                self.objects)
-
+        self._test_final_versions(final_versions)
-        self.assertEqual(1, len(final_versions))
-        self.assertDictEqual({'id': 1, 'sign': 1, 'version': 4, 'value': 0},
-                             final_versions[0].to_dict(field_names=('id', 'sign', 'value', 'version')))
 
     def test_get_final_versions_by_final_datetime(self):
         final_versions = ClickHouseCollapseTestModel.engine.get_final_versions(ClickHouseCollapseTestModel,
                                                                                self.objects, date_col='created')
-
+        self._test_final_versions(final_versions)
-        self.assertEqual(1, len(final_versions))
-        self.assertDictEqual({'id': 1, 'sign': 1, 'version': 4, 'value': 0},
-                             final_versions[0].to_dict(field_names=('id', 'sign', 'value', 'version')))
 
     def test_get_final_versions_by_version_datetime(self):
         ClickHouseCollapseTestModel.engine.version_col = 'version'
         final_versions = ClickHouseCollapseTestModel.engine.get_final_versions(ClickHouseCollapseTestModel,
                                                                                self.objects, date_col='created')
-
+        self._test_final_versions(final_versions)
-        self.assertEqual(1, len(final_versions))
-        self.assertDictEqual({'id': 1, 'sign': 1, 'version': 4, 'value': 0},
-                             final_versions[0].to_dict(field_names=('id', 'sign', 'value', 'version')))
 
     def test_versions(self):
         ClickHouseCollapseTestModel.engine.version_col = 'version'
         batch = ClickHouseCollapseTestModel.get_insert_batch(self.objects)
+        batch = list(batch)
         self.assertEqual(2, len(batch))
         self.assertEqual(4, batch[0].version)
         self.assertEqual(-1, batch[0].sign)

tests/test_serializers.py

@@ -16,7 +16,6 @@ class Django2ClickHouseModelSerializerTest(TestCase):
     def test_all(self):
         serializer = Django2ClickHouseModelSerializer(ClickHouseTestModel)
         res = serializer.serialize(self.obj)
-        self.assertIsInstance(res, ClickHouseTestModel)
         self.assertEqual(self.obj.id, res.id)
         self.assertEqual(self.obj.value, res.value)
         self.assertEqual(self.obj.created_date, res.created_date)
@@ -24,7 +23,6 @@ class Django2ClickHouseModelSerializerTest(TestCase):
     def test_fields(self):
         serializer = Django2ClickHouseModelSerializer(ClickHouseTestModel, fields=('value',))
         res = serializer.serialize(self.obj)
-        self.assertIsInstance(res, ClickHouseTestModel)
         self.assertEqual(0, res.id)
         self.assertEqual(datetime.date(1970, 1, 1), res.created_date)
         self.assertEqual(self.obj.value, res.value)
@@ -32,7 +30,6 @@ class Django2ClickHouseModelSerializerTest(TestCase):
     def test_exclude_fields(self):
         serializer = Django2ClickHouseModelSerializer(ClickHouseTestModel, exclude_fields=('created_date',))
         res = serializer.serialize(self.obj)
-        self.assertIsInstance(res, ClickHouseTestModel)
         self.assertEqual(datetime.date(1970, 1, 1), res.created_date)
         self.assertEqual(self.obj.id, res.id)
         self.assertEqual(self.obj.value, res.value)

tests/test_sync.py

@@ -53,7 +53,7 @@ class SyncTest(TransactionTestCase):
         ClickHouseCollapseTestModel.sync_batch_from_storage()
 
         synced_data = list(self.db.select('SELECT * FROM $table FINAL', model_class=ClickHouseCollapseTestModel))
-        self.assertGreaterEqual(1, len(synced_data))
+        self.assertGreaterEqual(len(synced_data), 1)
         self.assertEqual(obj.value, synced_data[0].value)
         self.assertEqual(obj.id, synced_data[0].id)
 
@@ -76,7 +76,7 @@ class SyncTest(TransactionTestCase):
         ClickHouseCollapseTestModel.sync_batch_from_storage()
 
         synced_data = list(self.db.select('SELECT * FROM $table FINAL', model_class=ClickHouseCollapseTestModel))
-        self.assertGreaterEqual(1, len(synced_data))
+        self.assertGreaterEqual(len(synced_data), 1)
         self.assertEqual(obj.value, synced_data[0].value)
         self.assertEqual(obj.id, synced_data[0].id)
 
@@ -116,7 +116,7 @@ class SyncTest(TransactionTestCase):
         ClickHouseMultiTestModel.sync_batch_from_storage()
 
         synced_data = list(self.db.select('SELECT * FROM $table FINAL', model_class=ClickHouseCollapseTestModel))
-        self.assertGreaterEqual(1, len(synced_data))
+        self.assertGreaterEqual(len(synced_data), 1)
         self.assertEqual(obj.value, synced_data[0].value)
         self.assertEqual(obj.id, synced_data[0].id)
 
@@ -154,9 +154,14 @@ class KillTest(TransactionTestCase):
             self.sync_iteration(False)
             sync_left = storage.operations_count(import_key)
 
-        ch_data = list(connections['default'].select('SELECT * FROM $table FINAL ORDER BY id',
+        logger.debug('django_clickhouse: sync finished')
+
+        ch_data = list(connections['default'].select_tuples('SELECT * FROM $table FINAL ORDER BY id',
                                                             model_class=ClickHouseCollapseTestModel))
+        logger.debug('django_clickhouse: got clickhouse data')
+
         pg_data = list(TestModel.objects.all().order_by('id'))
+        logger.debug('django_clickhouse: got postgres data')
 
         if len(pg_data) != len(ch_data):
             absent_ids = set(item.id for item in pg_data) - set(item.id for item in ch_data)
@@ -166,7 +171,8 @@ class KillTest(TransactionTestCase):
 
         self.assertEqual(len(pg_data), len(ch_data))
         serializer = ClickHouseCollapseTestModel.get_django_model_serializer()
-        self.assertListEqual(ch_data, list(serializer.serialize_many(pg_data)))
+        for pg_item, ch_item in zip(pg_data, ch_data):
+            self.assertEqual(ch_item, serializer.serialize(pg_item))
 
     @classmethod
     def sync_iteration(cls, kill=True):

tests/test_utils.py

@@ -1,5 +1,7 @@
 import datetime
+import time
 from queue import Queue
+from time import gmtime, localtime
 
 import pytz
 from django.test import TestCase
@@ -12,7 +14,9 @@ from django_clickhouse.utils import get_tz_offset, format_datetime, lazy_class_i
 
 class GetTZOffsetTest(TestCase):
     def test_func(self):
-        self.assertEqual(300, get_tz_offset())
+        ts = time.time()
+        utc_offset = (datetime.datetime.fromtimestamp(ts) - datetime.datetime.utcfromtimestamp(ts)).total_seconds()
+        self.assertEqual(utc_offset / 60, get_tz_offset())
 
 
 class FormatDateTimeTest(TestCase):