@pothos/plugin-dataloader/src/refs/object.ts

A Pothos plugin for attaching dataloader to object types

import { ImplementableObjectRef, ObjectRef, type SchemaTypes } from '@pothos/core';
import type DataLoader from 'dataloader';
import type { DataLoaderOptions } from '../types';
import { dataloaderGetter } from '../util';

export class LoadableObjectRef<
  Types extends SchemaTypes,
  RefShape,
  Shape,
  Key,
  CacheKey,
> extends ObjectRef<Types, RefShape, Shape> {
  getDataloader;

  constructor(
    name: string,
    getDataloader: (context: Types['Context']) => DataLoader<Key, Shape, CacheKey>,
  ) {
    super(name);

    this.getDataloader = getDataloader;
  }
}

export class ImplementableLoadableObjectRef<
  Types extends SchemaTypes,
  RefShape,
  Shape,
  Key extends bigint | number | string,
  CacheKey,
> extends ImplementableObjectRef<Types, RefShape, Shape> {
  getDataloader;

  protected cacheResolved;

  constructor(
    builder: PothosSchemaTypes.SchemaBuilder<Types>,
    name: string,
    {
      loaderOptions,
      load,
      toKey,
      sort,
      cacheResolved,
    }: DataLoaderOptions<Types, Shape | Error, Key, CacheKey, Shape>,
  ) {
    super(builder, name);

    this.getDataloader = dataloaderGetter<Key, Shape, CacheKey>(loaderOptions, load, toKey, sort);
    this.cacheResolved =
      typeof cacheResolved === 'function' ? cacheResolved : cacheResolved && toKey;

    this.builder.configStore.onTypeConfig(this, (config) => {
      config.extensions = {
        ...config.extensions,
        getDataloader: this.getDataloader,
        cacheResolved: this.cacheResolved,
      };
    });
  }
}