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from datetime import datetime
from typing import Dict, Tuple, Union
from langchain.chains.query_constructor.ir import (
Comparator,
Comparison,
Operation,
Operator,
StructuredQuery,
Visitor,
)
class WeaviateTranslator(Visitor):
"""Translate `Weaviate` internal query language elements to valid filters."""
allowed_operators = [Operator.AND, Operator.OR]
"""Subset of allowed logical operators."""
allowed_comparators = [
Comparator.EQ,
Comparator.NE,
Comparator.GTE,
Comparator.LTE,
Comparator.LT,
Comparator.GT,
]
def _format_func(self, func: Union[Operator, Comparator]) -> str:
self._validate_func(func)
# https://weaviate.io/developers/weaviate/api/graphql/filters
map_dict = {
Operator.AND: "And",
Operator.OR: "Or",
Comparator.EQ: "Equal",
Comparator.NE: "NotEqual",
Comparator.GTE: "GreaterThanEqual",
Comparator.LTE: "LessThanEqual",
Comparator.LT: "LessThan",
Comparator.GT: "GreaterThan",
}
return map_dict[func]
def visit_operation(self, operation: Operation) -> Dict:
args = [arg.accept(self) for arg in operation.arguments]
return {"operator": self._format_func(operation.operator), "operands": args}
def visit_comparison(self, comparison: Comparison) -> Dict:
value_type = "valueText"
value = comparison.value
if isinstance(comparison.value, bool):
value_type = "valueBoolean"
elif isinstance(comparison.value, float):
value_type = "valueNumber"
elif isinstance(comparison.value, int):
value_type = "valueInt"
elif (
isinstance(comparison.value, dict)
and comparison.value.get("type") == "date"
):
value_type = "valueDate"
# ISO 8601 timestamp, formatted as RFC3339
date = datetime.strptime(comparison.value["date"], "%Y-%m-%d")
value = date.strftime("%Y-%m-%dT%H:%M:%SZ")
filter = {
"path": [comparison.attribute],
"operator": self._format_func(comparison.comparator),
value_type: value,
}
return filter
def visit_structured_query(
self, structured_query: StructuredQuery
) -> Tuple[str, dict]:
if structured_query.filter is None:
kwargs = {}
else:
kwargs = {"where_filter": structured_query.filter.accept(self)}
return structured_query.query, kwargs
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