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Frameworks & web · #reflex
Goal: Enable automatic expiration of idle Reflex component state stored in server‑side sessions to bound memory usage during long‑lived WebSocket connections. Constraint: Reflex does not expose a built‑in configuration option for state timeout; implementing expiration requires custom session‑store middleware, which may interfere with the framework’s internal
The goal is to determine whether a Reflex exported frontend artifact can be safely restored or rebuilt when the associated Python backend has been rolled back after a failed upgrade, preserving functional consistency without unintended state divergence. Key constraints include the version coupling between the compiled frontend bundle and the backend API surf
State Persistence in Hot-Reloading Reflex allows developers to maintain component state across code changes using the preserve_state flag. While this ensures synchronous state values remain intact when the binary recompiles and the UI re-instantiates, the behavior of asynchronous operations during this transition is less clear. When a reload is triggered whi
When upgrading a Reflex application from a version that used in‑memory state to Reflex 0.5.0, the framework expects a SQLite database at the location previously used for state storage. The supplied reflex migrate-state command copies the existing in‑memory state into this new file, but the operation is not wrapped in a transaction. If the migration is halted
Event Handler Retry Behavior The @retry decorator in reflex.utils.retry allows event handlers and background tasks to automatically re-execute upon encountering an exception. While this ensures resilience against transient failures, the decorator operates independently of the function's side effects. Idempotency Constraints When applying this decorator to op
Developers need a way to control how Reflex groups state mutations into a single WebSocket push so that updates made both synchronously in an event handler and asynchronously via callbacks are guaranteed to be sent together, preventing split messages that can lead to inconsistent UI states. Currently, Reflex batches updates internally per event‑loop tick, bu
Computed Var Dependency Tracking Limits Reflex caches computed variable values based on declared dependencies within the State class. Computed vars relying on external inputs, such as system clocks or file contents, do not register these inputs as dependencies. Design Question Scope What is the intended behavior regarding cache invalidation for computed vars
Managing large datasets in Reflex requires implementing query bounding within State event handlers, as the framework lacks a built-in pagination primitive. Developers typically store an offset or a keyset cursor in the State to track the current data slice. A synchronization issue occurs when a user modifies a filter or sort order while navigated to a deep p
Problem: Large dataset in State causes WebSocket timeout In Reflex, a centralized State class synchronizes variables between the Python backend and the React frontend over a WebSocket connection. When a State variable holds thousands of records, the JSON payload generated for each update can exceed typical browser or server limits, leading to a WebSocket pay
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