[1.8.x] Fixed #24163 -- Removed unique constraint after index on MySQL

Thanks Łukasz Harasimowicz for the report.

Backport of 5792e6a88c1444d4ec84abe62077338ad3765b80 from master

1 files changed, 10 insertions, 0 deletions

diff --git a/tests/schema/models.py b/tests/schema/models.py
index df8a1c5ce4..6eba7ccae1 100644
--- a/tests/schema/models.py
+++ b/tests/schema/models.py
@@ -67,6 +67,16 @@ class BookWeak(models.Model):
         apps = new_apps
 
 
+class BookWithO2O(models.Model):
+    author = models.OneToOneField(Author)
+    title = models.CharField(max_length=100, db_index=True)
+    pub_date = models.DateTimeField()
+
+    class Meta:
+        apps = new_apps
+        db_table = "schema_book"
+
+
 class BookWithM2M(models.Model):
     author = models.ForeignKey(Author)
     title = models.CharField(max_length=100, db_index=True)