DataLoader
DataLoader batches related loads and can memoize results within a chosen scope.
Use this when Related resolvers repeat loads for the same entities.
without the term
“Our GraphQL query for posts with authors makes one database call per author. Can you batch those lookups together?”
with the term · How do you ask a model for DataLoader?
Batch these resolver loads with a request-scoped DataLoader. Verify query count, key ordering, missing records, and isolation between users.
What is DataLoader?
DataLoader collects the keys requested during one tick and loads them in a single batch, returning results in the same order. One loader is created per request so caches don't leak between users.
Why does DataLoader matter when vibe coding?
Creating a loader inside each resolver prevents useful batching.
How do you do DataLoader?
Share a loader within the authorized request scope and handle missing keys explicitly.
What goes wrong with DataLoader?
Sharing a loader cache across users without the required authorization boundaries.