Potential fix for #647

django_unicorn/typer.py

@@ -13,6 +13,7 @@
     parse_duration,
     parse_time,
 )
+from pydantic import BaseModel
 
 from django_unicorn.typing import QuerySetType
 
@@ -140,6 +141,9 @@ def cast_value(type_hint, value):
             if issubclass(type_hint, Model):
                 continue
 
+            if issubclass(type_hint, BaseModel) or is_dataclass(type_hint):
+                value = type_hint(**value)
+                break
             value = type_hint(value)
             break
 

tests/test_typer.py

@@ -1,7 +1,10 @@
+from dataclasses import dataclass
 import datetime
-from typing import Optional
+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 TestDataClass:
+    name: str
+
+
+class PydanticDataClass(BaseModel):
+    name: str
+
+
+class AnotherExampleClass:
+    data: TestDataClass
+    list_data: List[TestDataClass]
+    pydantic_data: PydanticDataClass
+    pydantic_list_data: List[PydanticDataClass]
+
+
+def test_cast_value_dataclass():
+    example_class = AnotherExampleClass()
+    test_data = TestDataClass(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 = PydanticDataClass(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 = TestDataClass(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 = PydanticDataClass(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]