getting item children list

src/items/items.model.ts

@@ -15,4 +15,7 @@ export class ItemModel {
 
   @Field({ nullable: true })
   parent?: ItemModel;
+
+  @Field((type) => [ItemModel])
+  children: ItemModel[];
 }

src/items/items.resolver.ts

@@ -25,6 +25,11 @@ export class ItemsResolver {
     return this.itemsService.getItemParent(item);
   }
 
+  @ResolveField()
+  async children(@Parent() item: ItemModel) {
+    return this.itemsService.getItemChildren(item);
+  }
+
   @Mutation((returns) => ItemModel)
   async createItem(@Args('itemData') itemData: NewItemInput) {
     return this.itemsService.createItem(itemData);

src/items/items.service.ts

@@ -21,13 +21,21 @@ export class ItemsService {
     return this.itemRepository.findOne(id);
   }
 
-  async getItemParent(item: ItemModel) {
+  async getItemParent(item: ItemModel): Promise<Item | undefined> {
     const childItem = await this.itemRepository.findOneOrFail(item.id, {
       relations: ['parent'],
     });
     return childItem.parent;
   }
 
+  async getItemChildren(item: ItemModel): Promise<Item[]> {
+    return this.itemRepository.find({
+      where: {
+        parent: item.id,
+      },
+    });
+  }
+
   async createItem(input: NewItemInput): Promise<Item> {
     const item = this.itemRepository.create({
       ...input,