[1.5.x] Fixed #19441 -- Created PostgreSQL varchar index when unique=True

Thanks Dylan Verheul for the report and Anssi Kääriäinen for the
review.
Backport of 55972ee5c from master.

2 files changed, 21 insertions, 1 deletions

diff --git a/tests/regressiontests/indexes/models.py b/tests/regressiontests/indexes/models.py
index 9758377f99..47ba5896a8 100644
--- a/tests/regressiontests/indexes/models.py
+++ b/tests/regressiontests/indexes/models.py
@@ -9,3 +9,9 @@ class Article(models.Model):
         index_together = [
             ["headline", "pub_date"],
         ]
+
+
+class IndexedArticle(models.Model):
+    headline = models.CharField(max_length=100, db_index=True)
+    body = models.TextField(db_index=True)
+    slug = models.CharField(max_length=40, unique=True, db_index=True)
diff --git a/tests/regressiontests/indexes/tests.py b/tests/regressiontests/indexes/tests.py
index 0dac881fa9..f3a32a44bb 100644
--- a/tests/regressiontests/indexes/tests.py
+++ b/tests/regressiontests/indexes/tests.py
@@ -1,8 +1,9 @@
 from django.core.management.color import no_style
 from django.db import connections, DEFAULT_DB_ALIAS
 from django.test import TestCase
+from django.utils.unittest import skipUnless
 
-from .models import Article
+from .models import Article, IndexedArticle
 
 
 class IndexesTests(TestCase):
@@ -10,3 +11,16 @@ class IndexesTests(TestCase):
         connection = connections[DEFAULT_DB_ALIAS]
         index_sql = connection.creation.sql_indexes_for_model(Article, no_style())
         self.assertEqual(len(index_sql), 1)
+
+    @skipUnless(connections[DEFAULT_DB_ALIAS].vendor == 'postgresql',
+        "This is a postgresql-specific issue")
+    def test_postgresql_text_indexes(self):
+        """Test creation of PostgreSQL-specific text indexes (#12234)"""
+        connection = connections[DEFAULT_DB_ALIAS]
+        index_sql = connection.creation.sql_indexes_for_model(IndexedArticle, no_style())
+        self.assertEqual(len(index_sql), 5)
+        self.assertIn('("headline" varchar_pattern_ops)', index_sql[1])
+        self.assertIn('("body" text_pattern_ops)', index_sql[3])
+        # unique=True and db_index=True should only create the varchar-specific
+        # index (#19441).
+        self.assertIn('("slug" varchar_pattern_ops)', index_sql[4])