Fixed #23423 -- Added unaccent lookup in django.contrib.postgres

tests/postgres_tests/test_unaccent.py

@@ -0,0 +1,65 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+import unittest
+
+from django.db import connection
+from django.test import TestCase, modify_settings
+
+from .models import CharFieldModel, TextFieldModel
+
+
+@unittest.skipUnless(connection.vendor == 'postgresql', 'PostgreSQL required')
+@modify_settings(INSTALLED_APPS={'append': 'django.contrib.postgres'})
+class UnaccentTest(TestCase):
+
+    Model = CharFieldModel
+
+    def setUp(self):
+        self.Model.objects.bulk_create([
+            self.Model(field="àéÖ"),
+            self.Model(field="aeO"),
+            self.Model(field="aeo"),
+        ])
+
+    def test_unaccent(self):
+        self.assertQuerysetEqual(
+            self.Model.objects.filter(field__unaccent="aeO"),
+            ["àéÖ", "aeO"],
+            transform=lambda instance: instance.field,
+            ordered=False
+        )
+
+    def test_unaccent_chained(self):
+        """
+        Check that unaccent can be used chained with a lookup (which should be
+        the case since unaccent implements the Transform API)
+        """
+        self.assertQuerysetEqual(
+            self.Model.objects.filter(field__unaccent__iexact="aeO"),
+            ["àéÖ", "aeO", "aeo"],
+            transform=lambda instance: instance.field,
+            ordered=False
+        )
+        self.assertQuerysetEqual(
+            self.Model.objects.filter(field__unaccent__endswith="éÖ"),
+            ["àéÖ", "aeO"],
+            transform=lambda instance: instance.field,
+            ordered=False
+        )
+
+    def test_unaccent_accentuated_needle(self):
+        self.assertQuerysetEqual(
+            self.Model.objects.filter(field__unaccent="aéÖ"),
+            ["àéÖ", "aeO"],
+            transform=lambda instance: instance.field,
+            ordered=False
+        )
+
+
+class UnaccentTextFieldTest(UnaccentTest):
+    """
+    TextField should have the exact same behavior as CharField
+    regarding unaccent lookups.
+    """
+    Model = TextFieldModel