Fixed #26808 -- Added Meta.indexes for class-based indexes.

* Added the index name to its deconstruction.
* Added indexes to sqlite3.schema._remake_table() so that indexes
  aren't dropped when _remake_table() is called.

Thanks timgraham & MarkusH for review and advice.

1 files changed, 8 insertions, 0 deletions

diff --git a/django/db/backends/sqlite3/schema.py b/django/db/backends/sqlite3/schema.py
index 1a9fb1523a..36adb22584 100644
--- a/django/db/backends/sqlite3/schema.py
+++ b/django/db/backends/sqlite3/schema.py
@@ -156,12 +156,20 @@ class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):
             for index in model._meta.index_together
         ]
 
+        indexes = model._meta.indexes
+        if delete_field:
+            indexes = [
+                index for index in indexes
+                if delete_field.name not in index.fields
+            ]
+
         # Construct a new model for the new state
         meta_contents = {
             'app_label': model._meta.app_label,
             'db_table': model._meta.db_table,
             'unique_together': unique_together,
             'index_together': index_together,
+            'indexes': indexes,
             'apps': apps,
         }
         meta = type("Meta", tuple(), meta_contents)