From 1d68eb638c93043b389f90c95edb37ffb457fcd8 Mon Sep 17 00:00:00 2001
From: Hasan Ramezani <hasan.r67@gmail.com>
Date: Wed, 10 Aug 2022 00:19:54 +0200
Subject: [PATCH] Fix __post_init_post_parse__ is incorrectly passed keyword
 arguments when no __post_init__ is defined

---
 pydantic/dataclasses.py   |  6 ++++--
 tests/test_dataclasses.py | 11 +++++++++++
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/pydantic/dataclasses.py b/pydantic/dataclasses.py
index 23178cf8f7e..abfe7d1322f 100644
--- a/pydantic/dataclasses.py
+++ b/pydantic/dataclasses.py
@@ -310,8 +310,10 @@ def new_init(self: 'Dataclass', *args: Any, **kwargs: Any) -> None:
                             # set arg value by default
                             initvars_and_values[f.name] = args[i]
                         except IndexError:
-                            initvars_and_values[f.name] = f.default
-                initvars_and_values.update(kwargs)
+                            if f.name in kwargs:
+                                initvars_and_values[f.name] = kwargs[f.name]
+                            else:
+                                initvars_and_values[f.name] = f.default
 
                 self.__post_init_post_parse__(**initvars_and_values)
 
diff --git a/tests/test_dataclasses.py b/tests/test_dataclasses.py
index f74b0874854..56ed9bf398f 100644
--- a/tests/test_dataclasses.py
+++ b/tests/test_dataclasses.py
@@ -600,6 +600,17 @@ def __post_init_post_parse__(self, base_path):
     assert PathDataPostInitPostParse('world', base_path='/hello').path == Path('/hello/world')
 
 
+def test_post_init_post_parse_without_initvars():
+    @pydantic.dataclasses.dataclass
+    class Foo:
+        a: int
+
+        def __post_init_post_parse__(self):
+            ...
+
+    Foo(a=1)
+
+
 def test_classvar():
     @pydantic.dataclasses.dataclass
     class TestClassVar: