Adds a test for BinaryField in order to test unknown parameters types.

cachalot/tests/migrations/0001_initial.py

@@ -23,6 +23,7 @@ class Migration(migrations.Migration):
                 ('datetime', models.DateTimeField(null=True, blank=True)),
                 ('owner', models.ForeignKey(blank=True, to=settings.AUTH_USER_MODEL, null=True)),
                 ('permission', models.ForeignKey(blank=True, to='auth.Permission', null=True)),
+                ('bin', models.BinaryField(null=True, blank=True)),
             ],
             options={
                 'ordering': ('name',),

cachalot/tests/migrations/0002_auto_20150416_0933.py

@@ -1,33 +0,0 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
-from django.db import models, migrations
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ('cachalot', '0001_initial'),
-    ]
-
-    operations = [
-        migrations.CreateModel(
-            name='TestOne',
-            fields=[
-                ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
-                ('name', models.CharField(max_length=20)),
-            ],
-        ),
-        migrations.CreateModel(
-            name='TestThese',
-            fields=[
-                ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
-                ('name', models.CharField(max_length=20)),
-            ],
-        ),
-        migrations.AddField(
-            model_name='testone',
-            name='have_lots_of_these',
-            field=models.ManyToManyField(to='cachalot.TestThese', null=True, blank=True),
-        ),
-    ]

cachalot/tests/models.py

@@ -5,7 +5,7 @@ from __future__ import unicode_literals
 from django.conf import settings
 from django.db.models import (
     Model, CharField, ForeignKey, BooleanField, DateField, DateTimeField,
-    ManyToManyField)
+    ManyToManyField, BinaryField)
 
 
 class Test(Model):
@@ -15,6 +15,7 @@ class Test(Model):
     date = DateField(null=True, blank=True)
     datetime = DateTimeField(null=True, blank=True)
     permission = ForeignKey('auth.Permission', null=True, blank=True)
+    bin = BinaryField(null=True, blank=True)
 
     class Meta(object):
         app_label = 'cachalot'

cachalot/tests/read.py

@@ -119,6 +119,24 @@ class ReadTestCase(TransactionTestCase):
         self.assertListEqual(data2, data1)
         self.assertListEqual(data2, [self.t2])
 
+        with self.assertNumQueries(1):
+            data1 = list(Test.objects.filter(
+                date__gt=datetime.date(1900, 1, 1)))
+        with self.assertNumQueries(0):
+            data2 = list(Test.objects.filter(
+                date__gt=datetime.date(1900, 1, 1)))
+        self.assertListEqual(data2, data1)
+        self.assertListEqual(data2, [self.t2])
+
+        with self.assertNumQueries(1):
+            data1 = list(Test.objects.filter(
+                datetime__lt=datetime.datetime(1900, 1, 1)))
+        with self.assertNumQueries(0):
+            data2 = list(Test.objects.filter(
+                datetime__lt=datetime.datetime(1900, 1, 1)))
+        self.assertListEqual(data2, data1)
+        self.assertListEqual(data2, [self.t1])
+
     def test_filter_empty(self):
         with self.assertNumQueries(1):
             data1 = list(Test.objects.filter(public=True,
@@ -618,3 +636,29 @@ class ReadTestCase(TransactionTestCase):
         with self.assertNumQueries(0):
             list(Test.objects.extra(tables=['Clémentine']))
         cursor.execute('DROP TABLE %s;' % table_name)
+
+    def test_binary_field(self):
+        """
+        Tests if queries on binary data are not cached.
+        Since binary fields use different classes with no clear way to hash
+        their values, it’s wiser not to cache them.
+
+        The only exception is MySQL, which serializes binary to a simple
+        Python bytes (str in Python 2).
+        """
+        is_mysql = connection.vendor == 'mysql'
+
+        with self.assertNumQueries(1):
+            list(Test.objects.filter(bin=None))
+        with self.assertNumQueries(0):
+            list(Test.objects.filter(bin=None))
+
+        with self.assertNumQueries(1):
+            list(Test.objects.filter(bin=b'abc'))
+        with self.assertNumQueries(0 if is_mysql else 1):
+            list(Test.objects.filter(bin=b'abc'))
+
+        with self.assertNumQueries(1):
+            list(Test.objects.filter(bin=b'def'))
+        with self.assertNumQueries(0 if is_mysql else 1):
+            list(Test.objects.filter(bin=b'def'))