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[REF-3375] useMemo on generateUUID props to maintain consistent value #3708

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Jul 27, 2024
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[REF-3375] useMemo on generateUUID props to maintain consistent value #3708

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16 changes: 12 additions & 4 deletions reflex/vars.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2552,17 +2552,25 @@ def __call__(self, *args, **kwargs) -> BaseVar:


def get_uuid_string_var() -> Var:
"""Return a var that generates UUIDs via .web/utils/state.js.
"""Return a Var that generates a single memoized UUID via .web/utils/state.js.

useMemo with an empty dependency array ensures that the generated UUID is
consistent across re-renders of the component.

Returns:
the var to generate UUIDs at runtime.
A Var that generates a UUID at runtime.
"""
from reflex.utils.imports import ImportVar

unique_uuid_var_data = VarData(
imports={f"/{constants.Dirs.STATE_PATH}": {ImportVar(tag="generateUUID")}} # type: ignore
imports={
f"/{constants.Dirs.STATE_PATH}": {ImportVar(tag="generateUUID")}, # type: ignore
"react": "useMemo",
}
)

return BaseVar(
_var_name="generateUUID()", _var_type=str, _var_data=unique_uuid_var_data
_var_name="useMemo(generateUUID, [])",
_var_type=str,
_var_data=unique_uuid_var_data,
)
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