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dataloader-values
Advanced tools
dataloader is an awesome package used for batching/caching and plays really well with GraphQL.
The only purpose of this package is to format the array of values returned from a batch function to uphold dataloader constraints:
- The Array of values must be the same length as the Array of keys.
- Each index in the Array of values must correspond to the same index in the Array of keys.
That means this package will be useful if it is difficult or impossible for you to accomplish any of the following with your batch function:
Note that missing values are filled in with null
for keys with single values and []
for keys with many values.
yarn add dataloader-values
or
npm install dataloader-values
Consider the example from dataloader
. Your implementation might look like this:
import DataLoader from 'dataloader';
import { alignSingleValues } from 'dataloader-values';
import batchFetchLocations from './batchFetchLocations'; // Your batch function
const locationLoader = new DataLoader(async keys => {
const values = await batchFetchLocations(keys);
const alignedValues = alignSingleValues({
keys,
values,
getKey: ({ id }) => id,
});
return alignedValues;
});
You can also return values grouped into arrays by key (e.g., in a one-to-many relationship). For instance:
import DataLoader from 'dataloader';
import { alignManyValues } from 'dataloader-values';
import batchFetchComments from './batchFetchComments'; // Your batch function
const commentsLoader = new DataLoader(async keys => {
// Returns flattened, ungrouped values
const values = await batchFetchComments(keys);
// Returns values grouped into arrays by key
const alignedValues = alignManyValues({
keys,
values,
getKey: ({ postId }) => postId,
});
return alignedValues;
});
See tests for a better breakdown of the data transformation.
export declare function alignSingleValues<TValue = any>(args: AlignValuesArgs<TValue>): TValue[];
export declare function alignManyValues<TValue = any>(args: AlignValuesArgs<TValue>): TValue[][];
Both exported functions expect an object with the following arguments:
Field | Description |
---|---|
keys | Array of DataLoader keys |
values | Array of values returned from batch function |
getKey | Callback function that returns the key from a single value (e.g., ({ id }) => id ) |
v2.0.0
hasMany
argument. Instead, the package now exports two separate functions: alignSingleValues
and alignManyValues
. Each function accepts the same arguments. This change makes it more clear what data is expected to be input and output, providing better TypeScript support.DataLoader
keys provided are either a string or number.DataLoaderOptions
interface has been replaced by AlignValuesArgs
.DataLoaderKey
type is now exported for TypeScript convenience.FAQs
Uphold value constraints of dataloader batch function
We found that dataloader-values demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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