Potential fix for #647

django_unicorn/management/commands/startunicorn.py

@@ -34,7 +34,7 @@ def get_app_path(app_name: str) -> Path:
 
 
 class Command(BaseCommand):
-    help = "Creates a new component for `django-unicorn`"  # noqa: A003
+    help = "Creates a new component for `django-unicorn`"
 
     def add_arguments(self, parser):
         parser.add_argument("app_name", type=str)

django_unicorn/typer.py

@@ -6,6 +6,18 @@
 from typing import get_type_hints as typing_get_type_hints
 from uuid import UUID
 
+try:
+    from pydantic import BaseModel
+
+    def _check_pydantic(cls) -> bool:
+        return issubclass(cls, BaseModel)
+
+except ImportError:
+
+    def _check_pydantic(cls) -> bool:  # noqa: ARG001
+        return False
+
+
 from django.db.models import Model, QuerySet
 from django.utils.dateparse import (
     parse_date,
@@ -140,6 +152,10 @@ def cast_value(type_hint, value):
             if issubclass(type_hint, Model):
                 continue
 
+            if _check_pydantic(type_hint) or is_dataclass(type_hint):
+                value = type_hint(**value)
+                break
+
             value = type_hint(value)
             break
 

tests/serializer/test_dumps.py

@@ -8,6 +8,7 @@
 import pytest
 from django.db import models
 from django.utils.timezone import now
+from pydantic import BaseModel
 
 from django_unicorn import serializer
 from django_unicorn.serializer import InvalidFieldAttributeError, InvalidFieldNameError
@@ -698,8 +699,6 @@ def test_nested_list_float_less_complicated():
 
 
 def test_pydantic():
-    from pydantic import BaseModel
-
     class Book(BaseModel):
         title = "The Grapes of Wrath"
         author = "John Steinbeck"

tests/test_typer.py

@@ -1,7 +1,10 @@
 import datetime
-from typing import Optional
+from dataclasses import dataclass
+from typing import List, Optional
 from typing import get_type_hints as typing_get_type_hints
 
+from pydantic import BaseModel
+
 from django_unicorn.components import UnicornView
 from django_unicorn.typer import cast_attribute_value, cast_value, get_type_hints
 from example.coffee.models import Flavor
@@ -111,3 +114,59 @@ def test_cast_value_model_int():
     actual = cast_value(type_hint, 1)
 
     assert actual == 1
+
+
+@dataclass
+class DataClass:
+    name: str
+
+
+class PydanticBaseModel(BaseModel):
+    name: str
+
+
+class AnotherExampleClass:
+    data: DataClass
+    list_data: List[DataClass]
+    pydantic_data: PydanticBaseModel
+    pydantic_list_data: List[PydanticBaseModel]
+
+
+def test_cast_value_dataclass():
+    example_class = AnotherExampleClass()
+    test_data = DataClass(name="foo")
+    example_class.data = test_data
+    type_hints = typing_get_type_hints(example_class)
+    type_hint = type_hints["data"]
+    actual = cast_value(type_hint, {"name": "foo"})
+    assert actual == test_data
+
+
+def test_cast_value_pydantic():
+    example_class = AnotherExampleClass()
+    test_data = PydanticBaseModel(name="foo")
+    example_class.pydantic_data = test_data
+    type_hints = typing_get_type_hints(example_class)
+    type_hint = type_hints["pydantic_data"]
+    actual = cast_value(type_hint, {"name": "foo"})
+    assert actual == test_data
+
+
+def test_cast_value_list_dataclass():
+    example_class = AnotherExampleClass()
+    test_data = DataClass(name="foo")
+    example_class.pydantic_list_data = [test_data]
+    type_hints = typing_get_type_hints(example_class)
+    type_hint = type_hints["list_data"]
+    actual = cast_value(type_hint, [{"name": "foo"}])
+    assert actual == [test_data]
+
+
+def test_cast_value_list_pydantic():
+    example_class = AnotherExampleClass()
+    test_data = PydanticBaseModel(name="foo")
+    example_class.pydantic_list_data = [test_data]
+    type_hints = typing_get_type_hints(example_class)
+    type_hint = type_hints["pydantic_list_data"]
+    actual = cast_value(type_hint, [{"name": "foo"}])
+    assert actual == [test_data]

tests/views/fake_components.py

@@ -84,7 +84,7 @@ class FakeModelFormComponent(UnicornView):
 
     title = None
     date_published = None
-    type = None  # noqa: A003
+    type = None
 
 
 class FakeModelComponent(UnicornView):