feat: add json support for NamedTuple

pydantic/main.py

@@ -34,7 +34,15 @@
 from .parse import Protocol, load_file, load_str_bytes
 from .schema import default_ref_template, model_schema
 from .types import PyObject, StrBytes
-from .typing import AnyCallable, get_args, get_origin, is_classvar, resolve_annotations, update_field_forward_refs
+from .typing import (
+    AnyCallable,
+    get_args,
+    get_origin,
+    is_classvar,
+    is_namedtuple,
+    resolve_annotations,
+    update_field_forward_refs,
+)
 from .utils import (
     ROOT_KEY,
     ClassAttribute,
@@ -732,7 +740,7 @@ def _get_value(
             }
 
         elif sequence_like(v):
-            return v.__class__(
+            seq_args = (
                 cls._get_value(
                     v_,
                     to_dict=to_dict,
@@ -748,6 +756,8 @@ def _get_value(
                 and (not value_include or value_include.is_included(i))
             )
 
+            return v.__class__(*seq_args) if is_namedtuple(v.__class__) else v.__class__(seq_args)
+
         elif isinstance(v, Enum) and getattr(cls.Config, 'use_enum_values', False):
             return v.value
 

tests/test_annotated_types.py

@@ -47,6 +47,7 @@ class Model(BaseModel):
     assert model.pos == Position('1', 2)
     assert model.events[0] == Event(1, 2, 3, 'qwe')
     assert repr(model) == "Model(pos=Pos(x='1', y=2), events=[Event(a=1, b=2, c=3, d='qwe')])"
+    assert model.json() == '{"pos": ["1", 2], "events": [[1, 2, 3, "qwe"]]}'
 
     with pytest.raises(ValidationError) as exc_info:
         Model(pos=('1', 2), events=[['qwe', '2', 3, 'qwe']])