reflex-dev/reflex reflex-base-v0.11.0

reflex-base@0.11.0

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Breaking Changes

• Reading a plain @property of a Pydantic model or dataclass through a state Var now raises VarAttributeError at compile time. The default serializer does not send such a property, so the Var always rendered empty. Use @pydantic.computed_field, or register an rx.serializer that includes the value. (#7648)

Features

• Serialize SQLAlchemy DeclarativeBase models without a custom @rx.serializer: loaded columns and relationships are sent, and unloaded or expired attributes are left out instead of raising DetachedInstanceError or MissingGreenlet. (#7756)
• On a state schema mismatch, a production page now dispatches a cancelable reflex:state-mismatch event on window before it reloads or shows the "new version available" banner. A listener that calls event.preventDefault() skips both, so the app decides when to reload; event.detail carries the frontend and backend state schema hashes. (#7653)
• With OpenTelemetry tracing enabled, JSON log records (REFLEX_LOG_JSON=true) emitted inside a span now include its trace_id and span_id, so logs can be correlated with traces. (#7668)

Bug Fixes

• Use the browser's current route when building the websocket connection's initial hydration event, so navigation during connection setup cannot run the previous page's on_load handler or redirect. (#7522)
• Fix uploads triggered by toast actions or rx.call_script callbacks failing with ReferenceError: filesById is not defined. Such uploads now send the files selected when they run, not when the toast opened. (#7409)
• Fix state updates streamed back during an upload being applied more than once, which could restore a value that a newer update had replaced. (#7721)
• Synced rx.LocalStorage vars in other tabs now reset to their defaults, like a page load, when localStorage is cleared or their key is removed. (#7652)
• Fix a TypeError when an event handler is called with a proxied state value (such as self.other(self.items)) after one was called with a proxied value of a different kind, such as a dict. (#7673)
• StringVar.reversed() now reverses Unicode code points, so a character such as an emoji is no longer split into lone surrogates. (#7548)
• Type SQLAlchemy synonym() attributes like the attribute they point to, so State.model.alias compiles and string operations such as .upper() work on it. (#7756)
• Under mypy, @rx.event handlers are typed as EventCallback instead of EventNamespace, so calling one directly no longer fails with "EventNamespace" not callable, and annotations through the event namespace, such as rx.event.EventSpec or rx.event.EventCallback[int], are accepted as types by mypy and pyright. (#7709, #7810)
• Calling an event handler with five to eight positional values now type-checks, binding every argument or the leading ones of a longer handler. (#7752)
• An EventHandler stored outside a state, e.g. in a dataclass field, now reads back as the handler for type checkers instead of Any; read through a state instance it is the bound function. (#7755)
• FunctionStringVar.create accepts _var_type=EventChain, for a JS function bound to an event trigger as its whole handler. (#7754)
• A column of a SQLAlchemy DeclarativeBase model whose column type gives no useful Python type, such as JSON, JSONB or PickleType, now has the type of its Mapped[...] annotation when read through a state var, so data: Mapped[dict] = mapped_column(JSON) supports State.model.data["key"], and a Mapped[list[str]] JSON column supports rx.foreach and array operations, without .to(dict). An annotation that refines the column's Python type, such as Mapped[dict[str, int]] over dict, is used too; otherwise the column type still decides. (#7798)
• Operations on an optional list var (list[T] | None) holding None no longer crash the page or the production prerender: the list acts as an empty list, so contains is false, length is 0 and join gives an empty string. As with any empty list, reduce without an initial value still raises; pass initial= when the list can be None. (#7800)
• A computed var that returns an optional list, tuple, set or frozenset (for example -> set[str] | None) now reads as ArrayVar or SetVar for type checkers instead of ComputedVar, so its operations type-check. (#7800)
• Deprecation warnings now point at the app line that triggered them when the deprecated call runs inside a reflex_components_* package (for example on_change=client_state.set_value), instead of a file in site-packages. (#7811)
• reflex run --json no longer waits on exit for a descendant process that outlives the app and keeps its output open, which could happen on Python 3.13 to 3.15, most often on Windows. (#7855)

Performance

• Inferring the type of a large dict var no longer copies all of its keys and values. (#7057)
• The first event of a handler that takes a dict, dataclass, TypedDict or Pydantic model argument no longer imports SQLAlchemy on the event loop. (#7802)

Documentation

• The REFLEX_ENV_MODE entry in the environment variable reference now says that reflex run and reflex export set it from --env, and that users should not set it. (#7712)