How to cache the result of resolver chains

[itssamuelrowe]

Hi.

Let's say I have a schema like this:

type Account {
   ...
}

type Transaction {
    account: Account!
    ...
}

The equivalent resolvers would be:

Query: {
 ...
},
Transaction: {
   account: async (...) => {
     // Make a database call
   }
}

I am trying to fetch 100 Transaction objects all pointing to the same Account object. Apollo invokes the chain resolver Transaction.account 100 times despite the account being the same.

Do I have to manually implement a caching strategy? Or is Apollo Server capable of doing this? If yes, how do I implement it?

Thanks!

[glasser]

This is what DataLoader is designed for: https://www.npmjs.com/package/dataloader
Typically you set up a DataLoader in your context function and call it from your resolvers.