[3.2] Adjust model indexes (#587)

django-stubs/db/models/indexes.pyi

@@ -1,10 +1,12 @@
-from typing import Any, List, Optional, Sequence, Tuple, Type
+from typing import Any, List, Optional, Sequence, Tuple, Type, Union
 
 from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.backends.ddl_references import Statement
 from django.db.models.base import Model
+from django.db.models.expressions import BaseExpression, Combinable
 from django.db.models.query_utils import Q
 
+
 class Index:
     model: Type[Model]
     suffix: str = ...
@@ -15,14 +17,17 @@ class Index:
     db_tablespace: Optional[str] = ...
     opclasses: Sequence[str] = ...
     condition: Optional[Q] = ...
+    expressions: Sequence[Union[Union[BaseExpression, Combinable]]]
+    include: Sequence[str]
     def __init__(
         self,
-        *,
+        *expressions: Union[BaseExpression, Combinable, str],
         fields: Sequence[str] = ...,
         name: Optional[str] = ...,
         db_tablespace: Optional[str] = ...,
         opclasses: Sequence[str] = ...,
-        condition: Optional[Q] = ...
+        condition: Optional[Q] = ...,
+        include: Optional[Sequence[str]] = ...,
     ) -> None: ...
     def check_name(self) -> List[str]: ...
     def create_sql(

tests/typecheck/models/test_indexes.yml

@@ -0,0 +1,10 @@
+-   case: model_index
+    main: |
+        from django.db import models
+        from django.db.models.functions import Lower
+        models.Index(fields=["foo"])
+        models.Index("foo", models.F("bar"), Lower("baz"), name="test")
+        models.Index("foo", name="test", opclasses=["bar"])
+        models.Index("foo", name="test", condition=models.Q(foo=1))
+        models.Index("foo", name="test", include=["bar"])
+