fix some bugs

src/reactpy_django/hooks.py

@@ -328,10 +328,12 @@ def use_user_data(
     async def _set_user_data(data):
         if not isinstance(data, dict):
             raise TypeError(f"Expected dict while setting user data, got {type(data)}")
+        if user.is_anonymous:
+            raise ValueError("AnonymousUser cannot have user data.")
 
         model, _ = await UserDataModel.objects.aget_or_create(user=user)
         model.data = pickle.dumps(data)
-        model.save()
+        await model.asave()
 
     data: Query[dict] = use_query(
         QueryOptions(postprocessor=None),
@@ -363,13 +365,11 @@ def _use_mutation_args_2(mutation, refetch=None):
 async def _get_user_data(user: AbstractUser, defaults: None | dict) -> dict:
     from reactpy_django.models import UserDataModel
 
-    if user is None:
-        raise ValueError("No user is available.")
+    if not user or user.is_anonymous:
+        raise UserNotFoundError("No user is available, cannot fetch user data.")
 
-    model, _ = await UserDataModel.objects.aget_or_create(
-        user=user, data=pickle.dumps({})
-    )
-    data = pickle.loads(model.data)
+    model, _ = await UserDataModel.objects.aget_or_create(user=user)
+    data = pickle.loads(model.data) if model.data else {}
 
     if not isinstance(data, dict):
         raise TypeError(f"Expected dict while loading user data, got {type(data)}")

src/reactpy_django/migrations/0007_alter_userdatamodel_user.py

@@ -0,0 +1,24 @@
+# Generated by Django 4.2.5 on 2023-09-26 07:03
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ("reactpy_django", "0006_userdatamodel"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="userdatamodel",
+            name="user",
+            field=models.ForeignKey(
+                on_delete=django.db.models.deletion.CASCADE,
+                to=settings.AUTH_USER_MODEL,
+                unique=True,
+            ),
+        ),
+    ]

src/reactpy_django/migrations/0008_alter_userdatamodel_user.py

@@ -0,0 +1,22 @@
+# Generated by Django 4.2.5 on 2023-09-26 07:04
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ("reactpy_django", "0007_alter_userdatamodel_user"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="userdatamodel",
+            name="user",
+            field=models.OneToOneField(
+                on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL
+            ),
+        ),
+    ]

src/reactpy_django/migrations/0009_alter_userdatamodel_data.py

@@ -0,0 +1,17 @@
+# Generated by Django 4.2.5 on 2023-09-26 07:33
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("reactpy_django", "0008_alter_userdatamodel_user"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="userdatamodel",
+            name="data",
+            field=models.BinaryField(blank=True, null=True),
+        ),
+    ]

src/reactpy_django/models.py

@@ -31,5 +31,5 @@ def load(cls):
 class UserDataModel(models.Model):
     """A model for storing `user_state` data."""
 
-    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)  # type: ignore
-    data = models.BinaryField(blank=True)  # type: ignore
+    user = models.OneToOneField(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)  # type: ignore
+    data = models.BinaryField(null=True, blank=True)  # type: ignore

src/reactpy_django/types.py

@@ -7,6 +7,7 @@
     Callable,
     Generic,
     MutableMapping,
+    NamedTuple,
     Protocol,
     Sequence,
     TypeVar,
@@ -101,7 +102,6 @@ class ComponentParams:
     kwargs: MutableMapping[str, Any]
 
 
-@dataclass
-class UserData(Generic[Inferred]):
-    data: Query[Inferred]
-    set_data: Mutation[Inferred]
+class UserData(NamedTuple):
+    data: Query[dict]
+    set_data: Mutation[dict]