Limit the data based on the feedback received from dataloader within the graphql platform

I've developed a data loader that can resolve various values of an item

export const Item: ItemResolvers = {
  id: async (item) => item.id,
  weight: async (item) => {
    const finalItem = await dataLoader.Item.load(item.id);
    return finalItem.weight;
  },
  name: async (item) => {
    const finalItem = await dataLoader.Item.load(item.id);
    return finalItem.name;
  },
  image: async (item) => {
    const finalItem = await dataLoader.Item.load(item.id);
    return finalItem.image;
  },
};

I'm facing a challenge in filtering items by their name. Initially, I only possess the item IDs. However, I am struggling to devise a method to filter out items once the dataloader has loaded their respective names.

Answer №1

This situation can be a bit challenging since resolving all item names before filtering is necessary. One alternative could be to perform the filtering at the parent query level, if that option is available. If you find yourself in a situation where you only have access to the full list of items, you can utilize Dataloader.loadMany():

const itemsResolver = async (parent, args) => {
  // Adjust according to your setup:
  const nameFilter = args.filter.name;
  const items = await loadItems();
  // Utilize the dataloader to load all items in the array
  const finalItems = await dataLoader.Item.loadMany(items.map(item => item.id));

  // Filtering the finalItems array seems suitable in this case:
  return finalItems.filter(item => item.name.includes(nameFilter));
  // Alternatively, if you want to return items with only the "id" property, you can filter the
  // initial items array using this technique: As the finalItems array contains the same items in order,
  // you can use the index to retrieve the corresponding finalItem
  return items.filter((_, index) => finalItems[index].name.includes(nameFilter));
}

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