v0.4.3 Pre-release Thread

[masenf]

Try out the Prerelease

Please report any problems you encounter in this discussion thread or as separate issues on reflex-dev/reflex.

pip install 'reflex~=0.4.3a'

Schedule

• 2024-02-29: 0.4.3a1 is released for general testing
• 2024-03-04 14:51 PST: 0.4.3 is published to PyPI

New Features

Set initial_value for rx.var and rx.cached_var

Provide a placeholder to avoid evaluating computed vars during compile time, for example, if they would perform database queries or other expensive operations.

class MyState(rx.State):
    @rx.var(initial_value=42)
    def answer(self):
        with rx.session() as session:
            session.exec(...)

• Initial values for computed vars by @benedikt-bartscher in Initial values for computed vars #2670

State.get_state allows access to arbitrary substates from within an event handler

class MyState(rx.State):
    answer: int = 42

class OtherState(rx.State):
    async def get_answer(self):
        my_state = await self.get_state(MyState)
        print(f"The answer is {my_state}.answer")

Note that get_state is an async function and must be await'ed

• [REF-1988] API to Get instance of Arbitrary State class by @masenf in [REF-1988] API to Get instance of Arbitrary State class #2678

CLI for Creating and Publishing 3rd Party Components

• Add support for custom components starter by @martinxu9 in Add support for custom components starter #2314

Improvements

Allow accent as a valid choice in rx.color

• added accent option in color by @wassafshahzad in added accent option in color #2713

Chakra no longer used when rendering Markdown

• remove chakra from markdown component_map by @Lendemor in remove chakra from markdown component_map #2709

Sidebar template uses all Radix components

• Lendemor/templates radix sidebar by @Lendemor in Lendemor/templates radix sidebar #2705

Disallow invalid /api prefix for frontend page routes

These routes conflict with what NextJS considers special "API routes" and thus do not work for reflex pages.

• [REF-1741] Disallow routes with /api prefix by @masenf in [REF-1741] Disallow routes with /api prefix #2711

rx.plotly now accepts arbitrary config prop

• Add config to rx.plotly component by @amirmolavi in Add config to rx.plotly component #2745

Computed Backend-only Vars

• DRAFT PR - Added code for computed backend vars by @wassafshahzad in DRAFT PR - Added code for computed backend vars #2540

Connection Pulser While Websocket is Disconnected

Only show the "Connection Error" banner after a few failed reconnection attempts.

• add pulser for connection + adjust condition for connnection_modal by @Lendemor in add pulser for connection + adjust condition for connnection_modal #2676

Reconnect Websocket in Stale Tabs

When a browser tab regains focus, automatically reconnect the websocket if it is disconnected.

• Reconnection Logic by @Yummy-Yums in Reconnection Logic #2743

Bug Fixes

• small update to color scheme high level select by @tgberkeley in small update to color scheme high level select #2712
• fix inherited backend var deps by @benedikt-bartscher in fix inherited backend var deps #2715
• Avoid frontend errors with getRefValue by @masenf in Avoid frontend errors with getRefValue #2691
• Add missing header variable in el components in init.py file. by @cllatser in Add missing header variable in el components in __init__.py file. #2732
• [REF-2101] Support default_value and default_checked on rx.el.input by @masenf in [REF-2101] Support default_value and default_checked on rx.el.input #2739
• fix initial value for color_mode by @Lendemor in fix initial value for color_mode #2741
• fix drawer on_open_change event by @Lendemor in fix drawer on_open_change event #2755
• call default_factorys on State.reset by @benedikt-bartscher in call default_factorys on State.reset #2749

Other Changes

• benchmarks.yml: skip benchmarking if the DATABASE_URL is not set by @masenf in benchmarks.yml: skip benchmarking if the DATABASE_URL is not set #2701
• do not store new_backend_vars in State class by @benedikt-bartscher in do not store new_backend_vars in State class #2707
• fix type of value2 in test_state by @benedikt-bartscher in fix type of value2 in test_state #2708
• pyproject.toml: bump to 0.4.2 by @masenf in pyproject.toml: bump to 0.4.2 #2724
• Update sidebar template README.md by @thedatadavis in Update sidebar template README.md #2735
• fix telemetry for init event by @Lendemor in fix telemetry for init event #2736
• Only alert users of reflex upgrade once per project by @ElijahAhianyo in Only alert users of reflex upgrade once per project #2731
• fix black+ruff by @benedikt-bartscher in fix black+ruff #2750
• add some backend var state inheritance tests by @benedikt-bartscher in add some backend var state inheritance tests #2685
• initial attempt at writing test for urls by @tgberkeley in initial attempt at writing test for urls #2689

New Contributors

• @thedatadavis made their first contribution in Update sidebar template README.md #2735
• @amirmolavi made their first contribution in Add config to rx.plotly component #2745

Full Changelog: v0.4.2...reflex-0.4.3

[masenf]

0.4.3 is now available