.github/workflows/python-tests.yml

@@ -11,56 +11,12 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
-        postgres-version: ["9.6", "10", "11", "12", "13", "14", "15", "16"]
-        django-version: ["3.2", "4.0", "4.1", "4.2", "5.0", "5.1"]
+        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10"]
+        postgres-version: ["9.6", "10", "11", "12", "13"]
+        django-version: ["2.1", "2.2", "3.0", "3.1", "3.2"]
         clickhouse-version: ["latest"]
         redis-version: ["latest"]
-        exclude:
-        # Django 4.0+ doesn't support PostgreSQL 9.6
-        - django-version: "4.0"
-          postgres-version: "9.6"
-        - django-version: "4.1"
-          postgres-version: "9.6"
-        - django-version: "4.2"
-          postgres-version: "9.6"
-        - django-version: "5.0"
-          postgres-version: "9.6"
-        - django-version: "5.1"
-          postgres-version: "9.6"
-
-        # Django 4.1+ doesn't support PostgreSQL 10
-        - django-version: "4.1"
-          postgres-version: "10"
-        - django-version: "4.2"
-          postgres-version: "10"
-        - django-version: "5.0"
-          postgres-version: "10"
-        - django-version: "5.1"
-          postgres-version: "10"
-
-        # Django 4.2+ doesn't support PostgreSQL 11
-        - django-version: "4.2"
-          postgres-version: "11"
-        - django-version: "5.0"
-          postgres-version: "11"
-        - django-version: "5.1"
-          postgres-version: "11"
-
-        # Django 5.1+ doesn't support PostgreSQL 12
-        - django-version: "5.1"
-          postgres-version: "12"
-
-        # Django 5.0+ does not support python 3.8, 3.9
-        - django-version: "5.0"
-          python-version: "3.8"
-        - django-version: "5.0"
-          python-version: "3.9"
-        - django-version: "5.1"
-          python-version: "3.8"
-        - django-version: "5.1"
-          python-version: "3.9"
-
+                      
     services:
       postgres:
         image: postgres:${{ matrix.postgres-version }}

docker-compose.yml

@@ -24,7 +24,7 @@ services:
     build:
       context: .
       args:
-        - PYTHON_IMAGE_TAG=latest
+        - PYTHON_VER=latest
     environment:
       - REDIS_HOST=redis_db
       - PGHOST=postgres_db

docs/overview.md

@@ -96,19 +96,6 @@ class ClickHouseUser(ClickHouseModel):
     engine = MergeTree('birthday', ('birthday',))
 ```
 
-**Important note**: `clickhouse_model.py` file is not anyhow imported by django initialization code. So if your models are not used anywhere excluding this file, you should import it somewhere in your code if you want synchroniztion working correctly. For instance, you can customise [AppConfig](https://docs.djangoproject.com/en/5.0/ref/applications/#django.apps.AppConfig.ready) like:
-
-```python
-from django.apps import AppConfig
-
-
-class MyAppConfig(AppConfig):
-    name = 'my_app'
-
-    def ready(self):
-        from my_app.clickhouse_models import ClickHouseUser
-```
-
 ## Migration to create table in ClickHouse
 1. Read [migrations](migrations.md) section
 2. Create `clickhouse_migrations` package in your django app
@@ -125,7 +112,7 @@ class MyAppConfig(AppConfig):
 4. Add content to file `0001_initial.py`:
     ```python
     from django_clickhouse import migrations
-    from my_app.clickhouse_models import ClickHouseUser
+    from my_app.cilckhouse_models import ClickHouseUser
     
     class Migration(migrations.Migration):
         operations = [

docs/routing.md

@@ -25,17 +25,12 @@ Router is a class, defining 3 methods:
   Returns `database alias` to use for given `model` for `SELECT` queries.
 * `def db_for_write(self, model: ClickHouseModel, **hints) -> str`  
   Returns `database alias` to use for given `model` for `INSERT` queries.
-* `def allow_migrate(self, db_alias: str, app_label: str, operation: Operation, **hints: dict) -> bool`
+* `def allow_migrate(self, db_alias: str, app_label: str, operation: Operation, model: Optional[ClickHouseModel] = None, **hints: dict) -> bool`
   Checks if migration `operation` should be applied in django application `app_label` on database `db_alias`.
-  Optional `hints` help to pass additional info which can be used to test migrations availability on concrete model.
+  Optional `model` field can be used to determine migrations on concrete model.
 
 By default [CLICKHOUSE_DATABASE_ROUTER](configuration.md#clickhouse_database_router) is used.
  It gets routing information from model fields, described below.  
- It also gives ability to use 2 kinds of hints:  
- * `force_migrate_on_databases: Iterable[str]` - concrete database aliases where migration should be applied
- * `model: Type[ClickHouseModel]` - a model class, to read routing attributes from. 
-    Can be set as class or its string name. 
-    If name is set, class is searched in current `<app_label>.<config.MODELS_MODULE>` package.  
  
 ## ClickHouseModel routing attributes
 Default database router reads routing settings from model attributes.

setup.py

@@ -13,7 +13,7 @@ with open('requirements.txt') as f:
 
 setup(
     name='django-clickhouse',
-    version='1.2.2',
+    version='1.2.0',
     packages=['django_clickhouse', 'django_clickhouse.management.commands'],
     package_dir={'': 'src'},
     url='https://github.com/carrotquest/django-clickhouse',

src/django_clickhouse/clickhouse_models.py

@@ -9,7 +9,6 @@ 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 django.utils.timezone import now
 from infi.clickhouse_orm.engines import CollapsingMergeTree
 from infi.clickhouse_orm.models import Model as InfiModel, ModelBase as InfiModelBase
 from statsd.defaults.django import statsd
@@ -291,7 +290,7 @@ class ClickHouseModel(InfiModel, metaclass=ClickHouseModelMeta):
         res = (datetime.datetime.now() - last_sync_time).total_seconds() >= cls.get_sync_delay()
         logger.debug('django-clickhouse: need_sync returned %s for class %s as no last sync found'
                      ' (now: %s, last: %s, delay: %d)'
-                     % (res, cls.__name__, now().isoformat(), last_sync_time.isoformat(),
+                     % (res, cls.__name__, datetime.datetime.now().isoformat(), last_sync_time.isoformat(),
                         cls.get_sync_delay()))
 
         return res

src/django_clickhouse/migrations.py

@@ -40,9 +40,10 @@ class Migration:
         database = database or connections[db_alias]
 
         for op in self.operations:
+            model_class = getattr(op, 'model_class', None)
             hints = getattr(op, 'hints', {})
 
-            if db_router.allow_migrate(db_alias, self.__module__, op, **hints):
+            if db_router.allow_migrate(db_alias, self.__module__, op, model_class, **hints):
                 op.apply(database)
 
 

src/django_clickhouse/routers.py

@@ -30,26 +30,24 @@ class DefaultRouter:
         """
         return random.choice(model.write_db_aliases)
 
-    def allow_migrate(self, db_alias: str, app_label: str, operation: Operation, **hints) -> bool:
+    def allow_migrate(self, db_alias: str, app_label: str, operation: Operation,
+                      model=None, **hints) -> bool:
         """
         Checks if migration can be applied to given database
         :param db_alias: Database alias to check
         :param app_label: App from which migration is got
         :param operation: Operation object to perform
+        :param model: Model migration is applied to
         :param hints: Hints to make correct decision
         :return: boolean
         """
         if hints.get("force_migrate_on_databases", None):
             return db_alias in hints["force_migrate_on_databases"]
 
-        model = hints.get('model') or getattr(operation, 'model_class', None)
-        if model is None:
-            raise ValueError('"model_class" attribute is not defined for operation "%s". '
-                             'Please provide "force_migrate_on_databases" or "model" in hints.'
-                             % operation.__class__.__name__)
+        if hints.get('model'):
+            model = '%s.%s.%s' % (app_label, config.MODELS_MODULE, hints['model']) \
+                if isinstance(hints['model'], str) else hints['model']
 
-        model = '%s.%s.%s' % (app_label, config.MODELS_MODULE, model) \
-            if isinstance(model, str) else model
         model = lazy_class_import(model)
 
         if operation.__class__ not in {CreateTable, DropTable}:

src/django_clickhouse/storages.py

@@ -11,15 +11,12 @@ import logging
 from typing import Any, Optional, List, Tuple
 
 import os
-
-from celery.utils.nodenames import gethostname
-from django.utils.timezone import now
 from statsd.defaults.django import statsd
 
 from .configuration import config
 from .exceptions import ConfigurationError, RedisLockTimeoutError
 from .redis import redis_zadd
-from .utils import check_pid_exists, get_subclasses, SingletonMeta
+from .utils import check_pid, get_subclasses, SingletonMeta
 
 logger = logging.getLogger('django-clickhouse')
 
@@ -189,7 +186,8 @@ class RedisStorage(Storage, metaclass=SingletonMeta):
 
     def get_operations(self, import_key, count, **kwargs):
         ops_key = self.REDIS_KEY_OPS_TEMPLATE.format(import_key=import_key)
-        res = self._redis.zrangebyscore(ops_key, '-inf', now().timestamp(), start=0, num=count, withscores=True)
+        res = self._redis.zrangebyscore(ops_key, '-inf', datetime.datetime.now().timestamp(), start=0, num=count,
+                                        withscores=True)
 
         if res:
             ops, scores = zip(*res)
@@ -216,31 +214,19 @@ class RedisStorage(Storage, metaclass=SingletonMeta):
         # Block process to be single threaded. Default sync delay is 10 * default sync delay.
         # It can be changed for model, by passing `lock_timeout` argument to pre_sync
         lock = self.get_lock(import_key, **kwargs)
-        current_host_name = gethostname()
         lock_pid_key = self.REDIS_KEY_LOCK_PID.format(import_key=import_key)
         try:
             lock.acquire()
-            self._redis.set(lock_pid_key, '%s:%s' % (current_host_name, os.getpid()))
+            self._redis.set(lock_pid_key, os.getpid())
         except RedisLockTimeoutError:
             statsd.incr('%s.sync.%s.lock.timeout' % (config.STATSD_PREFIX, import_key))
-
             # Lock is busy. But If the process has been killed, I don't want to wait any more.
-            # I assume that lock has been killed if it works on the same host (other than localhost)
-            #   and there is no process alive.
-            # I also assume that there are no hosts with same hostname other than localhost.
-            # Note: previously value contained only pid. Let's support old value for back compatibility
-            active_lock_data = self._redis.get(lock_pid_key).split(b":")
-            active_pid = int(active_lock_data[-1] or 0)
-            active_host_name = active_lock_data[0] \
-                if len(active_lock_data) > 1 and active_lock_data[0] != "localhost" else None
-
-            if (
-                active_pid and active_host_name
-                and active_host_name == current_host_name and not check_pid_exists(active_pid)
-            ):
+            # Let's check if pid exists
+            pid = int(self._redis.get(lock_pid_key) or 0)
+            if pid and not check_pid(pid):
                 statsd.incr('%s.sync.%s.lock.hard_release' % (config.STATSD_PREFIX, import_key))
                 logger.warning('django-clickhouse: hard releasing lock "%s" locked by pid %d (process is dead)'
-                               % (import_key, active_pid))
+                               % (import_key, pid))
                 self._redis.delete(lock_pid_key)
                 lock.hard_release()
                 self.pre_sync(import_key, **kwargs)

src/django_clickhouse/utils.py

@@ -127,7 +127,7 @@ def model_to_dict(instance: DjangoModel, fields:  Optional[Iterable[str]] = None
     return data
 
 
-def check_pid_exists(pid):
+def check_pid(pid):
     """
     Check For the existence of a unix pid.
     """

tests/fixtures/test_model.json

@@ -5,7 +5,7 @@
     "fields": {
       "value": 100,
       "created_date": "2018-01-01",
-      "created": "2018-01-01 00:00:00+0000"
+      "created": "2018-01-01 00:00:00"
     }
   },
   {
@@ -14,7 +14,7 @@
     "fields": {
       "value": 200,
       "created_date": "2018-02-01",
-      "created": "2018-02-01 00:00:00+0000"
+      "created": "2018-02-01 00:00:00"
     }
   },
   {
@@ -23,7 +23,7 @@
     "fields": {
       "value": 300,
       "created_date": "2018-03-01",
-      "created": "2018-03-01 00:00:00+0000"
+      "created": "2018-03-01 00:00:00"
     }
   },
   {
@@ -32,7 +32,7 @@
     "fields": {
       "value": 400,
       "created_date": "2018-04-01",
-      "created": "2018-04-01 00:00:00+0000"
+      "created": "2018-04-01 00:00:00"
     }
   },
   {
@@ -41,7 +41,7 @@
     "fields": {
       "value": 500,
       "created_date": "2018-05-01",
-      "created": "2018-05-01 00:00:00+0000"
+      "created": "2018-05-01 00:00:00"
     }
   }
 ]

tests/fixtures/test_secondary_model.json

@@ -5,7 +5,7 @@
     "fields": {
       "value": 100,
       "created_date": "2018-01-01",
-      "created": "2018-02-01 00:00:00+0000"
+      "created": "2018-02-01 00:00:00"
     }
   },
   {
@@ -14,7 +14,7 @@
     "fields": {
       "value": 200,
       "created_date": "2018-02-01",
-      "created": "2018-02-01 00:00:00+0000"
+      "created": "2018-02-01 00:00:00"
     }
   }
 ]

tests/kill_test_sub_process.py

@@ -8,7 +8,6 @@ from time import sleep
 
 import datetime
 
-from django.utils.timezone import now
 
 # set Django environment
 sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
@@ -26,7 +25,7 @@ logger = logging.getLogger('django-clickhouse')
 def create(batch_size=1000, test_time=60, period=1, **kwargs):
     for iteration in range(int(test_time / period)):
         res = TestModel.objects.db_manager('test_db').bulk_create([
-            TestModel(created=now(), created_date='2018-01-01', value=iteration * batch_size + i)
+            TestModel(created=datetime.datetime.now(), created_date='2018-01-01', value=iteration * batch_size + i)
             for i in range(batch_size)
         ])
         logger.info('django-clickhouse: test created %d records' % len(res))
@@ -55,8 +54,8 @@ def sync(period=1, test_time=60, **kwargs):
     if kwargs['once']:
         ClickHouseCollapseTestModel.sync_batch_from_storage()
     else:
-        start = now()
-        while (now() - start).total_seconds() < test_time:
+        start = datetime.datetime.now()
+        while (datetime.datetime.now() - start).total_seconds() < test_time:
             ClickHouseCollapseTestModel.sync_batch_from_storage()
             sleep(period)
 

tests/settings.py

@@ -4,7 +4,6 @@ This file contains django settings to run tests with runtests.py
 from os import environ
 
 SECRET_KEY = 'fake-key'
-USE_TZ = True
 
 DATABASES = {
     'default': {

tests/test_clickhouse_models.py

@@ -1,7 +1,6 @@
 import datetime
 
 from django.test import TestCase
-from django.utils.timezone import now
 
 from tests.clickhouse_models import ClickHouseTestModel
 
@@ -21,11 +20,11 @@ class ClickHouseModelTest(TestCase):
         self.assertTrue(ClickHouseTestModel.need_sync())
 
         # Time hasn't passed - no sync
-        self.storage.set_last_sync_time(ClickHouseTestModel.get_import_key(), now())
+        self.storage.set_last_sync_time(ClickHouseTestModel.get_import_key(), datetime.datetime.now())
         self.assertFalse(ClickHouseTestModel.need_sync())
 
         # Time has passed
         sync_delay = ClickHouseTestModel.get_sync_delay()
         self.storage.set_last_sync_time(ClickHouseTestModel.get_import_key(),
-                                        now() - datetime.timedelta(seconds=sync_delay + 1))
+                                        datetime.datetime.now() - datetime.timedelta(seconds=sync_delay + 1))
         self.assertTrue(ClickHouseTestModel.need_sync())

tests/test_migrations.py

@@ -13,7 +13,7 @@ from tests.clickhouse_models import ClickHouseTestModel
 
 
 class NoMigrateRouter(DefaultRouter):
-    def allow_migrate(self, db_alias, app_label, operation, **hints):
+    def allow_migrate(self, db_alias, app_label, operation, model=None, **hints):
         return False
 
 

tests/test_models.py

@@ -40,7 +40,7 @@ class TestOperations(TransactionTestCase):
 
     def test_save(self):
         # INSERT operation
-        instance = self.django_model(created_date=datetime.date.today(), created=now(), value=2)
+        instance = self.django_model(created_date=datetime.date.today(), created=datetime.datetime.now(), value=2)
         instance.save()
         self.assertListEqual([('insert', "%s.%d" % (self.db_alias, instance.pk))],
                              self.storage.get_operations(self.clickhouse_model.get_import_key(), 10))
@@ -52,13 +52,13 @@ class TestOperations(TransactionTestCase):
                              self.storage.get_operations(self.clickhouse_model.get_import_key(), 10))
 
     def test_create(self):
-        instance = self.django_model.objects.create(pk=100555, created_date=datetime.date.today(), created=now(),
-                                                    value=2)
+        instance = self.django_model.objects.create(pk=100555, created_date=datetime.date.today(),
+                                                    created=datetime.datetime.now(), value=2)
         self.assertListEqual([('insert', "%s.%d" % (self.db_alias, instance.pk))],
                              self.storage.get_operations(self.clickhouse_model.get_import_key(), 10))
 
     def test_bulk_create(self):
-        items = [self.django_model(created_date=datetime.date.today(), created=now(), value=i)
+        items = [self.django_model(created_date=datetime.date.today(), created=datetime.datetime.now(), value=i)
                  for i in range(5)]
         items = self.django_model.objects.bulk_create(items)
         self.assertEqual(5, len(items))
@@ -187,7 +187,7 @@ class TestOperations(TransactionTestCase):
 
     def test_get_or_create(self):
         instance, created = self.django_model.objects. \
-            get_or_create(pk=100, defaults={'created_date': datetime.date.today(), 'created': now(),
+            get_or_create(pk=100, defaults={'created_date': datetime.date.today(), 'created': datetime.datetime.now(),
                                             'value': 2})
 
         self.assertTrue(created)
@@ -203,7 +203,8 @@ class TestOperations(TransactionTestCase):
 
     def test_update_or_create(self):
         instance, created = self.django_model.objects. \
-            update_or_create(pk=100, defaults={'created_date': datetime.date.today(), 'created': now(), 'value': 2})
+            update_or_create(pk=100, defaults={'created_date': datetime.date.today(),
+                                               'created': datetime.datetime.now(), 'value': 2})
         self.assertTrue(created)
         self.assertListEqual([('insert', "%s.%d" % (self.db_alias, instance.pk))],
                              self.storage.get_operations(self.clickhouse_model.get_import_key(), 10))
@@ -228,7 +229,7 @@ class TestOperations(TransactionTestCase):
 
     def test_bulk_create_returning(self):
         items = [
-            self.django_model(created_date=datetime.date.today(), created=now(), value=i)
+            self.django_model(created_date=datetime.date.today(), created=datetime.datetime.now(), value=i)
             for i in range(5)
         ]
         items = self.django_model.objects.bulk_create_returning(items)
@@ -259,7 +260,7 @@ class TestOperations(TransactionTestCase):
 
     def test_save_returning(self):
         # INSERT operation
-        instance = self.django_model(created_date=datetime.date.today(), created=now(), value=2)
+        instance = self.django_model(created_date=datetime.date.today(), created=datetime.datetime.now(), value=2)
         instance.save_returning()
         self.assertListEqual([('insert', "%s.%d" % (self.db_alias, instance.pk))],
                              self.storage.get_operations(self.clickhouse_model.get_import_key(), 10))
@@ -283,7 +284,6 @@ class TestOperations(TransactionTestCase):
 
 
 class TestSecondaryOperations(TestOperations):
-    # from django.db.models.fields import *
     fixtures = ['test_secondary_model']
     django_model = SecondaryTestModel
     clickhouse_model = ClickHouseSecondTestModel

tests/test_routers.py

@@ -1,59 +0,0 @@
-from django.test import SimpleTestCase
-
-from django_clickhouse.migrations import RunSQL, CreateTable
-from django_clickhouse.routers import DefaultRouter
-from tests.clickhouse_models import ClickHouseTestModel
-
-
-class DefaultRouterAllowMigrateTest(SimpleTestCase):
-    def setUp(self):
-        self.router = DefaultRouter()
-        self.operation = RunSQL('SELECT 1')
-
-    def test_hints_model_class(self):
-        hints = {'model': ClickHouseTestModel}
-
-        with self.subTest('Allow migrate'):
-            res = self.router.allow_migrate('default', 'tests', self.operation, **hints)
-            self.assertTrue(res)
-
-        with self.subTest('Reject migrate'):
-            res = self.router.allow_migrate('other', 'tests', self.operation, **hints)
-            self.assertFalse(res)
-
-    def test_hints_model_name(self):
-        hints = {'model': 'ClickHouseTestModel'}
-
-        with self.subTest('Allow migrate'):
-            res = self.router.allow_migrate('default', 'tests', self.operation, **hints)
-            self.assertTrue(res)
-
-        with self.subTest('Reject migrate'):
-            res = self.router.allow_migrate('other', 'tests', self.operation, **hints)
-            self.assertFalse(res)
-
-    def test_hints_force_migrate_on_databases(self):
-        hints = {'force_migrate_on_databases': ['secondary']}
-
-        with self.subTest('Allow migrate'):
-            res = self.router.allow_migrate('secondary', 'apps', self.operation, **hints)
-            self.assertTrue(res)
-
-        with self.subTest('Reject migrate'):
-            res = self.router.allow_migrate('default', 'apps', self.operation, **hints)
-            self.assertFalse(res)
-
-    def test_model_operation(self):
-        with self.subTest('Allow migrate'):
-            operation = CreateTable(ClickHouseTestModel)
-            res = self.router.allow_migrate('default', 'apps', operation)
-            self.assertTrue(res)
-
-        with self.subTest('Reject migrate'):
-            operation = CreateTable(ClickHouseTestModel)
-            res = self.router.allow_migrate('other', 'apps', operation)
-            self.assertFalse(res)
-
-    def test_no_model(self):
-        with self.assertRaises(ValueError):
-            self.router.allow_migrate('default', 'apps', self.operation)

tests/test_sync.py

@@ -30,7 +30,7 @@ class SyncTest(TransactionTestCase):
         ClickHouseTestModel.get_storage().flush()
 
     def test_simple(self):
-        obj = TestModel.objects.create(value=1, created=now(), created_date=datetime.date.today())
+        obj = TestModel.objects.create(value=1, created=datetime.datetime.now(), created_date=datetime.date.today())
         ClickHouseTestModel.sync_batch_from_storage()
 
         synced_data = list(ClickHouseTestModel.objects.all())
@@ -40,7 +40,7 @@ class SyncTest(TransactionTestCase):
         self.assertEqual(obj.id, synced_data[0].id)
 
     def test_collapsing_update_by_final(self):
-        obj = TestModel.objects.create(value=1, created=now(), created_date=datetime.date.today())
+        obj = TestModel.objects.create(value=1, created=datetime.datetime.now(), created_date=datetime.date.today())
         obj.value = 2
         obj.save()
         ClickHouseCollapseTestModel.sync_batch_from_storage()
@@ -63,7 +63,7 @@ class SyncTest(TransactionTestCase):
     def test_collapsing_update_by_version(self):
         ClickHouseCollapseTestModel.engine.version_col = 'version'
 
-        obj = TestModel.objects.create(value=1, created=now(), created_date=datetime.date.today())
+        obj = TestModel.objects.create(value=1, created=datetime.datetime.now(), created_date=datetime.date.today())
         obj.value = 2
         obj.save()
         ClickHouseCollapseTestModel.sync_batch_from_storage()
@@ -97,7 +97,7 @@ class SyncTest(TransactionTestCase):
         self.assertEqual(0, len(synced_data))
 
     def test_multi_model(self):
-        obj = TestModel.objects.create(value=1, created=now(), created_date=datetime.date.today())
+        obj = TestModel.objects.create(value=1, created=datetime.datetime.now(), created_date=datetime.date.today())
         obj.value = 2
         obj.save()
         ClickHouseMultiTestModel.sync_batch_from_storage()
@@ -268,7 +268,7 @@ class ProfileTest(TransactionTestCase):
         ClickHouseTestModel.sync_enabled = False
 
         TestModel.objects.bulk_create([
-            TestModel(created=now(), created_date='2018-01-01', value=i)
+            TestModel(created=datetime.datetime.now(), created_date='2018-01-01', value=i)
             for i in range(self.BATCH_SIZE)
         ])