From 93832e1048f8faf0b1c3d1d5d5c382e44d1464ff Mon Sep 17 00:00:00 2001
From: Alexander Tikhonov <fatal1ty.rnd@gmail.com>
Date: Wed, 8 Jun 2022 12:41:00 +0300
Subject: [PATCH] Fix using generics inside DataClassMessagePackMixin
 dataclasses

---
 mashumaro/core/meta/builder.py |  2 +-
 tests/test_dialect.py          | 21 ++++++++++++---------
 2 files changed, 13 insertions(+), 10 deletions(-)

diff --git a/mashumaro/core/meta/builder.py b/mashumaro/core/meta/builder.py
index fff38644..4cb8dcec 100644
--- a/mashumaro/core/meta/builder.py
+++ b/mashumaro/core/meta/builder.py
@@ -577,7 +577,7 @@ def is_code_generation_option_enabled(self, option: str, cls=None) -> bool:
             cls = self.cls
         if option == ADD_DIALECT_SUPPORT:
             # TODO: make inheritance for code_generation_options
-            for ancestor in cls.__mro__[-1:0:-1]:
+            for ancestor in get_type_origin(cls).__mro__[-1:0:-1]:
                 if (
                     type_name(ancestor)
                     == "mashumaro.mixins.msgpack.DataClassMessagePackMixin"
diff --git a/tests/test_dialect.py b/tests/test_dialect.py
index fb81e8c1..46985ffa 100644
--- a/tests/test_dialect.py
+++ b/tests/test_dialect.py
@@ -195,9 +195,10 @@ class Config(BaseConfig):
 
 @dataclass
 class MessagePackDataClass(DataClassMessagePackMixin):
-    b: bytes
-    bb: bytearray
-    dep: DataClassWithoutDialects
+    b_1: bytes
+    b_2: bytearray
+    dep_1: DataClassWithoutDialects
+    dep_2: GenericDataClassWithoutDialects[date]
 
 
 def test_default_dialect():
@@ -890,14 +891,16 @@ def test_dialect_with_inheritance():
 def test_msgpack_dialect_class_with_dependency_without_dialect():
     dt = date(2022, 6, 8)
     obj = MessagePackDataClass(
-        b=b"123",
-        bb=bytearray([4, 5, 6]),
-        dep=DataClassWithoutDialects(dt, 123),
+        b_1=b"123",
+        b_2=bytearray([4, 5, 6]),
+        dep_1=DataClassWithoutDialects(dt, 123),
+        dep_2=GenericDataClassWithoutDialects(dt, 123),
     )
     d = {
-        "b": b"123",
-        "bb": bytearray([4, 5, 6]),
-        "dep": {"dt": "2022-06-08", "i": 123},
+        "b_1": b"123",
+        "b_2": bytearray([4, 5, 6]),
+        "dep_1": {"dt": "2022-06-08", "i": 123},
+        "dep_2": {"dt": "2022-06-08", "i": 123},
     }
     encoded = msgpack_encoder(d)
     assert obj.to_msgpack() == encoded