Fixes Django 1.7 compatibility.

cachalot/tests/__init__.py

@@ -1,3 +1,5 @@
+from django import VERSION as django_version
+
 from .read import ReadTestCase
 from .write import WriteTestCase, DatabaseCommandTestCase
 from .transaction import AtomicTestCase
@@ -6,4 +8,5 @@ from .multi_db import MultiDatabaseTestCase
 from .settings import SettingsTestCase
 from .api import APITestCase, CommandTestCase
 from .signals import SignalsTestCase
-from .postgres import PostgresReadTest
+if django_version >= (1, 8):
+    from .postgres import PostgresReadTest

cachalot/tests/migrations/0001_initial.py

@@ -2,8 +2,8 @@
 
 from __future__ import unicode_literals
 
+from django import VERSION as django_version
 from django.conf import settings
-from django.contrib.postgres.fields import ArrayField, IntegerRangeField
 from django.db import models, migrations
 
 
@@ -47,6 +47,12 @@ class Migration(migrations.Migration):
             ],
             bases=('cachalot.testparent',),
         ),
+    ]
+
+if django_version >= (1, 8):
+    from django.contrib.postgres.fields import ArrayField, IntegerRangeField
+
+    Migration.operations.append(
         migrations.CreateModel(
             name='PostgresModel',
             fields=[
@@ -57,5 +63,5 @@ class Migration(migrations.Migration):
                     null=True, blank=True)),
                 ('int_range', IntegerRangeField(null=True, blank=True)),
             ],
-        ),
-    ]
+        )
+    )

cachalot/tests/models.py

@@ -2,8 +2,8 @@
 
 from __future__ import unicode_literals
 
+from django import VERSION as django_version
 from django.conf import settings
-from django.contrib.postgres.fields import ArrayField, IntegerRangeField
 from django.db.models import (
     Model, CharField, ForeignKey, BooleanField, DateField, DateTimeField,
     ManyToManyField, BinaryField, IntegerField)
@@ -31,7 +31,10 @@ class TestChild(TestParent):
     permissions = ManyToManyField('auth.Permission', blank=True)
 
 
-class PostgresModel(Model):
-    int_array = ArrayField(IntegerField(null=True, blank=True), size=3,
-                           null=True, blank=True)
-    int_range = IntegerRangeField(null=True, blank=True)
+if django_version >= (1, 8):
+    from django.contrib.postgres.fields import ArrayField, IntegerRangeField
+
+    class PostgresModel(Model):
+        int_array = ArrayField(IntegerField(null=True, blank=True), size=3,
+                               null=True, blank=True)
+        int_range = IntegerRangeField(null=True, blank=True)

cachalot/tests/postgres.py

@@ -3,6 +3,7 @@
 from __future__ import unicode_literals
 from unittest import skipUnless
 
+from django import VERSION as django_version
 from django.db import connection
 from django.test import TransactionTestCase
 from psycopg2._range import NumericRange
@@ -10,8 +11,8 @@ from psycopg2._range import NumericRange
 from .models import PostgresModel
 
 
-@skipUnless(connection.vendor == 'postgresql',
-            'This test is for PostgreSQL only')
+@skipUnless(connection.vendor == 'postgresql' and django_version[:2] >= (1, 8),
+            'This test is only for PostgreSQL and Django >= 1.8')
 class PostgresReadTest(TransactionTestCase):
     def setUp(self):
         self.obj = PostgresModel.objects.create(