Ryth Azhur
37f3f3d3eb
affects_params is a callable that extracts which specific params were
affected by a mutation. The server uses it to produce scoped
invalidation in both transports:
@client(affects=UserContext, affects_params=lambda req: {'user_id': req.user.pk})
def update_avatar(request, url: str) -> dict: ...
JSON body: {"result": ..., "invalidate": [{"context": "user", "params": {"user_id": 42}}]}
Header: X-Mizan-Invalidate: user;user_id=42
Edge reads the scoped params to purge only /profile/42/ instead of
all user profiles. The runtime refetches only the UserContext mounted
with user_id=42, not all UserContext instances.
Requires affects= to be set. Falls back to broad invalidation if
the callable fails.
272 Django tests pass.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
mizan (Python)
Django server functions framework. See the monorepo root for full documentation.
Install
uv add "mizan[channels,allauth] @ git+https://git.impactsoundworks.com/isw/mizan.git#subdirectory=django"
Setup
# settings.py
INSTALLED_APPS = ["mizan", ...]
# urls.py
path("api/mizan/", include("mizan.urls"))
# asgi.py (optional, for WebSocket)
from mizan import wrap_asgi
application = wrap_asgi(get_asgi_application())
Define Functions
from mizan.client import client
from mizan.setup.registry import register
from pydantic import BaseModel
class Output(BaseModel):
message: str
@client
def echo(request, text: str) -> Output:
return Output(message=text)
register(echo, "echo")
Register in apps.py:
def ready(self):
import myapp.mizan_clients
Auth
@client(auth=True) # requires authentication
@client(auth='staff') # requires is_staff
@client(auth='superuser') # requires is_superuser
@client(auth=my_callable) # custom check
Contexts
@client(context='global') # fetched once, SSR-hydrated, becomes useCurrentUser()
@client(context='local') # fetched with params, becomes <GreetProvider>
Forms
from mizan.forms import mizanFormMixin, mizanFormMeta
class ContactForm(mizanFormMixin, forms.Form):
mizan = mizanFormMeta(name="contact", title="Contact Us")
name = forms.CharField()
email = forms.EmailField()
def on_submit_success(self, request):
return {"sent": True}
Auto-registers contact.schema, contact.validate, contact.submit. Generates useContactForm() with Zod validation.
Channels
from mizan.channels import ReactChannel
class ChatChannel(ReactChannel):
class Params(BaseModel):
room: str
class DjangoMessage(BaseModel):
text: str
def authorize(self, params):
return self.user.is_authenticated
def group(self, params):
return f"chat_{params.room}"
Generates useChatChannel({ room }).
Running Tests
uv sync --extra dev --extra channels
uv run pytest