Method _generate_test

tinydb/queries.py:207–241

Generate a query based on a test function that first resolves the query path. :param test: The test the query executes. :param hashval: The hash of the query. :return: A :class:`~tinydb.queries.QueryInstance` object

(
            self,
            test: Callable[[Any], bool],
            hashval: Tuple,
            allow_empty_path: bool = False
    )

        return self.__getattr__(item)

    def _generate_test(
            self,
            test: Callable[[Any], bool],
            hashval: Tuple,
            allow_empty_path: bool = False
    ) -> QueryInstance:
        """
        Generate a query based on a test function that first resolves the query
        path.

        :param test: The test the query executes.
        :param hashval: The hash of the query.
        :return: A :class:`~tinydb.queries.QueryInstance` object
        """
        if not self._path and not allow_empty_path:
            raise ValueError('Query has no path')

        def runner(value):
            try:
                # Resolve the path
                for part in self._path:
                    if isinstance(part, str):
                        value = value[part]
                    else:
                        value = part(value)
            except (KeyError, TypeError):
                return False
            else:
                # Perform the specified test
                return test(value)

        return QueryInstance(
            lambda value: runner(value),
            (hashval if self.is_cacheable() else None)
        )

    def __eq__(self, rhs: Any):
        """