Source code for langchain.retrievers.self_query.dingo

from typing import Tuple, Union

from langchain_core.structured_query import (
    Comparator,
    Comparison,
    Operation,
    Operator,
    StructuredQuery,
    Visitor,
)


[docs]class DingoDBTranslator(Visitor): """Translate `DingoDB` internal query language elements to valid filters.""" allowed_comparators = ( Comparator.EQ, Comparator.NE, Comparator.LT, Comparator.LTE, Comparator.GT, Comparator.GTE, ) """Subset of allowed logical comparators.""" allowed_operators = (Operator.AND, Operator.OR) """Subset of allowed logical operators.""" def _format_func(self, func: Union[Operator, Comparator]) -> str: self._validate_func(func) return f"${func.value}"
[docs] def visit_operation(self, operation: Operation) -> Operation: return operation
[docs] def visit_comparison(self, comparison: Comparison) -> Comparison: return comparison
[docs] def visit_structured_query( self, structured_query: StructuredQuery ) -> Tuple[str, dict]: if structured_query.filter is None: kwargs = {} else: kwargs = { "search_params": { "langchain_expr": structured_query.filter.accept(self) } } return structured_query.query, kwargs