Use typehint to construct a dataclass if possible.

Author: adamghill

django_unicorn/views.py

@@ -1,5 +1,6 @@
 import copy
 import logging
+from dataclasses import is_dataclass
 from functools import wraps
 from typing import Any, Dict, List, Union, get_type_hints
 
@@ -158,7 +159,11 @@ def _set_property_from_data(
             # Usually the value will be a string (because it is coming from JSON)
             # and basic types can be constructed by passing in a string,
             # i.e. int("1") or float("1.1")
-            value = type_hints[name](value)
+
+            if is_dataclass(type_hints[name]):
+                value = type_hints[name](**value)
+            else:
+                value = type_hints[name](value)
 
         if hasattr(component_or_field, "_set_property"):
             # Can assume that `component_or_field` is a component

tests/views/message/test_type_hints.py

@@ -1,3 +1,4 @@
+from dataclasses import dataclass
 from decimal import Decimal
 
 import orjson
@@ -6,12 +7,18 @@
 from tests.views.message.utils import post_and_get_response
 
 
+@dataclass
+class ExampleDataclass:
+    hello: str = "world"
+
+
 class FakeObjectsComponent(UnicornView):
     template_name = "templates/test_component.html"
 
     decimal_example: Decimal = Decimal(1.1)
     float_example: float = 1.2
     int_example: int = 3
+    dataclass_example: ExampleDataclass = None
 
     def assert_int(self):
         assert self.int_example == 4
@@ -22,6 +29,10 @@ def assert_float(self):
     def assert_decimal(self):
         assert self.decimal_example == Decimal(1.5)
 
+    def assert_dataclass(self):
+        assert self.dataclass_example == ExampleDataclass(hello="world")
+        assert self.dataclass_example.hello == "world"
+
 
 FAKE_OBJECTS_COMPONENT_URL = (
     "/message/tests.views.message.test_type_hints.FakeObjectsComponent"
@@ -71,3 +82,18 @@ def test_message_decimal(client):
         "error"
     )  # UnicornViewError/AssertionError returns a a JsonResponse with "error" key
     assert not body["errors"]
+
+
+def test_message_dataclass(client):
+    data = {"dataclass_example": {"hello": "world"}}
+    action_queue = [{"payload": {"name": "assert_dataclass"}, "type": "callMethod",}]
+    response = post_and_get_response(
+        client, url=FAKE_OBJECTS_COMPONENT_URL, data=data, action_queue=action_queue,
+    )
+
+    body = orjson.loads(response.content)
+
+    assert not body.get(
+        "error"
+    )  # UnicornViewError/AssertionError returns a a JsonResponse with "error" key
+    assert not body["errors"]