fix: variable length tuples of compound types

changes/2416-PrettyWood.md

@@ -0,0 +1 @@
+Support properly variable length tuples of compound types

pydantic/fields.py

@@ -538,6 +538,7 @@ def _type_analysis(self) -> None:  # noqa: C901 (ignore complexity)
             elif len(args) == 2 and args[1] is Ellipsis:  # e.g. Tuple[int, ...]
                 self.type_ = args[0]
                 self.shape = SHAPE_TUPLE_ELLIPSIS
+                self.sub_fields = [self._create_sub_type(args[0], f'{self.name}_0')]
             elif args == ((),):  # Tuple[()] means empty tuple
                 self.shape = SHAPE_TUPLE
                 self.type_ = Any

tests/test_edge_cases.py

@@ -203,12 +203,19 @@ class Model(BaseModel):
         empty_tuple: Tuple[()]
         simple_tuple: tuple = None
         tuple_of_different_types: Tuple[int, float, str, bool] = None
+        tuple_of_single_tuples: Tuple[Tuple[int], ...] = ()
 
-    m = Model(empty_tuple=[], simple_tuple=[1, 2, 3, 4], tuple_of_different_types=[4, 3, 2, 1])
+    m = Model(
+        empty_tuple=[],
+        simple_tuple=[1, 2, 3, 4],
+        tuple_of_different_types=[4, 3, 2, 1],
+        tuple_of_single_tuples=(('1',), (2,)),
+    )
     assert m.dict() == {
         'empty_tuple': (),
         'simple_tuple': (1, 2, 3, 4),
         'tuple_of_different_types': (4, 3.0, '2', True),
+        'tuple_of_single_tuples': ((1,), (2,)),
     }