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+---
+title: "GraphQL Dataloaders"
+showtoc: true
+---
+
+[Dataloaders](https://github.com/graphql/dataloader) are used in GraphQL to solve the so called N+1 problem.
+
+## N+1 problem
+
+Imagine a cart with 20 items. Your implementation requires you to perform an `async` calculation `isSubscription` for each cart item whih executes one or more queries each time it is called and it takes pretty long on each execution. It works fine for a cart with 1 or 2 items. But with more than 15 items, suddenly the cart takes a **lot** longer to load. Especially when the site is busy.
+
+The reason: the N+1 problem. Your cart is firing of 20 or more queries almost at the same time, adding **significantly** to the GraphQL request. It's like going to the McDonald's drive-in to get 10 hamburgers and getting in line 10 times to get 1 hamburger at a time. It's not efficient.
+
+## The solution: dataloaders
+
+Dataloaders allow you to say: instead of loading each field in the `grapqhl` tree one at a time, aggregate all the `ids` you want to execute the `async` calculation for, and then execute this for all the `ids` in one efficient `request`.
+
+Dataloaders are generally used on `fieldResolver`s. Often, you will need a specific dataloader for each field resolver.
+
+A Dataloader can return anything: `boolean`, `ProductVariant`, `string`, etc
+
+## Performance implications
+
+Dataloaders can have a huge impact on performance. If your `fieldResolver` executes queries, and you log these queries, you should see a cascade of queries before the implementation of the dataloader, change to a single query using multiple `ids` after you implement it.
+
+## Do I need this for `CustomField` relations? 
+
+No, not normally. `CustomField` relations are automatically added to the root query for the `entity` that they are part of. So, they are loaded as part of the query that loads that entity.
+
+## Example
+
+We will provide a complete example here for you to use as a starting point. The skeleton created can handle multiple dataloaders across multiple channels. We will implement a `fieldResolver` called `isSubscription` for an `OrderLine` that will return a `true/false` for each incoming `orderLine`, to indicate whether the `orderLine` represents a subscription.
+
+
+```ts title="src/plugins/my-plugin/api/api-extensions.ts"
+import gql from 'graphql-tag';
+
+export const shopApiExtensions = gql`
+    extend type OrderLine {
+        isSubscription: Boolean!
+    }
+`
+```
+
+**Dataloader skeleton**
+
+```ts title="src/plugins/my-plugin/api/datalaoder.ts"
+import DataLoader from 'dataloader'
+
+const LoggerCtx = 'SubscriptionDataloaderService'
+
+@Injectable({ scope: Scope.REQUEST }) // Important! Dataloaders live at the request level
+export class DataloaderService {
+
+  /**
+   * first level is channel identifier, second level is dataloader key
+   */
+  private loaders = new Map<string, Map<string, DataLoader<ID, any>>>()
+
+  constructor(private service: SubscriptionExtensionService) {}
+
+  getLoader(ctx: RequestContext, dataloaderKey: string) {
+    const token = ctx.channel?.code ?? `${ctx.channelId}`
+    
+    Logger.debug(`Dataloader retrieval: ${token}, ${dataloaderKey}`, LoggerCtx)
+
+    if (!this.loaders.has(token)) {
+      this.loaders.set(token, new Map<string, DataLoader<ID, any>>())
+    }
+
+    const channelLoaders = this.loaders.get(token)!
+    if (!channelLoaders.get(dataloaderKey)) {
+      let loader: DataLoader<ID, any>
+
+      switch (dataloaderKey) {
+        case 'is-subscription':
+          loader = new DataLoader<ID, any>((ids) =>
+            this.batchLoadIsSubscription(ctx, ids as ID[]),
+          )
+          break
+        // Implement cases for your other dataloaders here
+        default:
+          throw new Error(`Unknown dataloader key ${dataloaderKey}`)
+      }
+
+      channelLoaders.set(dataloaderKey, loader)
+    }
+    return channelLoaders.get(dataloaderKey)!
+  }
+
+  private async batchLoadIsSubscription(
+    ctx: RequestContext,
+    ids: ID[],
+  ): Promise<Boolean[]> {
+    // Returns an array of ids that represent those input ids that are subscriptions
+    // Remember: this array can be smaller than the input array
+    const subscriptionIds = await this.service.whichSubscriptions(ctx, ids)
+
+    Logger.debug(`Dataloader is-subscription: ${ids}: ${subscriptionIds}`, LoggerCtx)
+
+    return ids.map((id) => subscriptionIds.includes(id)) // Important! preserve order and size of input ids array
+  }
+}
+```
+
+
+```ts title="src/plugins/my-plugin/api/entity-resolver.ts"
+@Resolver(() => OrderLine)
+export class MyPluginOrderLineEntityResolver {
+  constructor(
+    private dataloaderService: DataloaderService,
+  ) {}
+
+  @ResolveField()
+  isSubscription(@Ctx() ctx: RequestContext, @Parent() parent: OrderLine) {
+    const loader = this.dataloaderService.getLoader(ctx, 'is-subscription')
+    return loader.load(parent.id)
+  }
+}
+```
+
+To make it all work, ensure that the `DataLoaderService` is loaded in your `plugin` as a provider.
+
+:::tip
+Dataloaders map the result in the same order as the `ids` you send to the dataloader. 
+Dataloaders expect the same order and array size in the return result. 
+
+In other words: ensure that the order of your returned result is the same as the incoming `ids` and don't omit values!
+:::
+
diff --git a/docs/sidebars.js b/docs/sidebars.js
index a365a8fcfb..6c429541ea 100644
--- a/docs/sidebars.js
+++ b/docs/sidebars.js
@@ -92,6 +92,7 @@ const sidebars = {
                     className: 'sidebar-section-header',
                 },
                 'guides/developer-guide/cache/index',
+                'guides/developer-guide/dataloaders/index',
                 'guides/developer-guide/db-subscribers/index',
                 'guides/developer-guide/importing-data/index',
                 'guides/developer-guide/logging/index',