Fixed #29178 -- Allowed Index.fields to accept a tuple.

1 files changed, 4 insertions, 4 deletions

diff --git a/django/db/models/indexes.py b/django/db/models/indexes.py
index fc24433a33..b601d98492 100644
--- a/django/db/models/indexes.py
+++ b/django/db/models/indexes.py
@@ -12,12 +12,12 @@ class Index:
     # cross-database compatibility with Oracle)
     max_name_length = 30
 
-    def __init__(self, *, fields=[], name=None, db_tablespace=None):
-        if not isinstance(fields, list):
-            raise ValueError('Index.fields must be a list.')
+    def __init__(self, *, fields=(), name=None, db_tablespace=None):
+        if not isinstance(fields, (list, tuple)):
+            raise ValueError('Index.fields must be a list or tuple.')
         if not fields:
             raise ValueError('At least one field is required to define an index.')
-        self.fields = fields
+        self.fields = list(fields)
         # A list of 2-tuple with the field name and ordering ('' or 'DESC').
         self.fields_orders = [
             (field_name[1:], 'DESC') if field_name.startswith('-') else (field_name, '')