Method modify_state

nextpy/app.py:807–833

Modify the state out of band. Args: token: The token to modify the state for. Yields: The state to modify. Raises: RuntimeError: If the app has not been initialized yet.

(self, token: str)

            compiler_utils.write_page(output_path, code)
    @contextlib.asynccontextmanager
    async def modify_state(self, token: str) -> AsyncIterator[BaseState]:
        """Modify the state out of band.

        Args:
            token: The token to modify the state for.

        Yields:
            The state to modify.

        Raises:
            RuntimeError: If the app has not been initialized yet.
        """
        if self.event_namespace is None:
            raise RuntimeError("App has not been initialized yet.")

        # Get exclusive access to the state.
        async with self.state_manager.modify_state(token) as state:
            # No other event handler can modify the state while in this context.
            yield state
            delta = state.get_delta()
            if delta:
                # When the state is modified reset dirty status and emit the delta to the frontend.
                state._clean()
                await self.event_namespace.emit_update(
                    update=StateUpdate(delta=delta),
                    sid=state.router.session.session_id,
                )

    def _process_background(
        self, state: BaseState, event: Event