CODEWITHSUNDEEP
graphql
Michalis
Michalis

Reputation: 6926

GraphQL Dataloader - Global variable with load() function

I'm using graphql with dataloader. I have this call inside a type. My problem is that when I call "categoryPhotoLoader" I want to pass user_id as a global param for every _id. Is this possible, or I have to create a concat (${_id}_${user_id}) and get inside the dataloader the first user_id of the keys? (split the string and get the user_id part of the first id)

async photoS3({_id, user_id}, _, {categoryPhotoLoader}) {
    return categoryPhotoLoader.load(`${_id}_${user_id}`);
}

I would like something like that

async photoS3({_id, user_id}, _, {categoryPhotoLoader}) {
    return categoryPhotoLoader.load(_id, {user_id: user_id});
}

Upvotes: 0

Views: 1261

Answers (1)

Daniel Rearden
Daniel Rearden

Reputation: 84657

Dataloader keys do not have to be Strings, they can be Arrays, Objects or other data types. So you can do:

categoryPhotoLoader.load({ _id, user_id })

and this Object will be passed to your batch function. If you do this, you'll want to provide a cacheKeyFn to your Loader's constructor so that dataloader can tell when two keys are equivalent. In this case, it would be simple enough to do something like:

new DataLoader(batchLoadFn, { cacheKeyFn: ({ _id, user_id }) => ${_id}${user_id}, })

Be wary of using JSON.stringify since you want to ensure the correct order of properties in the string.

Upvotes: 3

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