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⚡ Bolt: optimize GraphQL list_items with Pydantic TypeAdapter #52

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⚡ Bolt: optimize GraphQL list_items with Pydantic TypeAdapter #52

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10 changes: 8 additions & 2 deletions templates/graphql/handler.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@
from aws_lambda_powertools.event_handler import AppSyncResolver
from aws_lambda_powertools.logging import correlation_paths
from aws_lambda_powertools.utilities.typing import LambdaContext
from pydantic import ValidationError
from pydantic import TypeAdapter, ValidationError

from templates.graphql.models import Item
from templates.graphql.settings import Settings
Expand All @@ -17,6 +17,8 @@
repository = Repository(settings.table_name)
app = AppSyncResolver()

ITEMS_ADAPTER = TypeAdapter(list[Item])


@app.resolver(type_name="Query", field_name="getItem")
@tracer.capture_method
Expand Down Expand Up @@ -47,7 +49,11 @@ def list_items() -> list[dict]:
A list of items.
"""
try:
return [Item.model_validate(item).dump() for item in repository.list_items()]
# Optimization: use Pydantic TypeAdapter for batch validation and serialization.
# This leverages Pydantic V2's Rust-based engine to process the entire list at once,
# which is significantly faster than individual model_validate and dump calls in a loop.
items = ITEMS_ADAPTER.validate_python(repository.list_items())
return ITEMS_ADAPTER.dump_python(items, by_alias=True, exclude_none=True) # type: ignore
except Exception as error:
logger.error("Failed to list items", exc_info=error)
raise RuntimeError("Failed to list items") from error
Expand Down