diff --git a/src/items/dto/new-item.input.ts b/src/items/dto/new-item.input.ts
index f8bbce1..bcd221e 100644
--- a/src/items/dto/new-item.input.ts
+++ b/src/items/dto/new-item.input.ts
@@ -7,4 +7,7 @@ export class NewItemInput {
 
   @Field({ nullable: true })
   notes?: string;
+
+  @Field((type) => ID, { nullable: true })
+  parent?: number;
 }
diff --git a/src/items/items.entity.ts b/src/items/items.entity.ts
index 783ab8d..fc2dfaf 100644
--- a/src/items/items.entity.ts
+++ b/src/items/items.entity.ts
@@ -1,13 +1,29 @@
-import { Column, Entity, PrimaryGeneratedColumn } from 'typeorm';
+import {
+  Column,
+  Entity,
+  PrimaryGeneratedColumn,
+  Tree,
+  TreeChildren,
+  TreeParent,
+} from 'typeorm';
 
 @Entity()
+@Tree('closure-table', {
+  closureTableName: 'item_closure',
+})
 export class Item {
-  @PrimaryGeneratedColumn('increment')
-  id: number;
+  @PrimaryGeneratedColumn('increment', { type: 'bigint' })
+  id: string;
 
   @Column()
   name: string;
 
   @Column({ nullable: true })
   notes?: string;
+
+  @TreeParent()
+  parent?: Item;
+
+  @TreeChildren()
+  children: Item[];
 }
diff --git a/src/items/items.model.ts b/src/items/items.model.ts
index b4028a8..fabb7ad 100644
--- a/src/items/items.model.ts
+++ b/src/items/items.model.ts
@@ -12,4 +12,7 @@ export class ItemModel {
 
   @Field({ nullable: true })
   notes?: string;
+
+  @Field({ nullable: true })
+  parent?: ItemModel;
 }
diff --git a/src/items/items.resolver.ts b/src/items/items.resolver.ts
index e67b5c7..b1b4697 100644
--- a/src/items/items.resolver.ts
+++ b/src/items/items.resolver.ts
@@ -1,4 +1,12 @@
-import { Args, ID, Mutation, Query, Resolver } from '@nestjs/graphql';
+import {
+  Args,
+  ID,
+  Mutation,
+  Parent,
+  Query,
+  ResolveField,
+  Resolver,
+} from '@nestjs/graphql';
 import { NewItemInput } from './dto/new-item.input';
 import { ItemModel } from './items.model';
 import { ItemsService } from './items.service';
@@ -12,6 +20,12 @@ export class ItemsResolver {
     return this.itemsService.getItem(id);
   }
 
+  @ResolveField()
+  async parent(@Parent() item: ItemModel) {
+    if (item.parent) return item.parent;
+    return this.itemsService.getItemParent(item);
+  }
+
   @Mutation((returns) => ItemModel)
   async createItem(@Args('itemData') itemData: NewItemInput) {
     return this.itemsService.createItem(itemData);
diff --git a/src/items/items.service.ts b/src/items/items.service.ts
index 7b93af6..f3ce947 100644
--- a/src/items/items.service.ts
+++ b/src/items/items.service.ts
@@ -1,24 +1,39 @@
 import { Injectable } from '@nestjs/common';
-import { InjectRepository } from '@nestjs/typeorm';
-import { Repository } from 'typeorm';
+import { InjectEntityManager, InjectRepository } from '@nestjs/typeorm';
+import { EntityManager, Repository, TreeRepository } from 'typeorm';
 import { NewItemInput } from './dto/new-item.input';
 import { Item } from './items.entity';
+import { ItemModel } from './items.model';
 
 @Injectable()
 export class ItemsService {
   constructor(
     @InjectRepository(Item)
     private itemRepository: Repository<Item>,
-  ) {}
+    @InjectEntityManager()
+    private entityManager: EntityManager,
+  ) {
+    this.treeRepository = this.entityManager.getTreeRepository(Item);
+  }
+  treeRepository: TreeRepository<Item>;
 
   async getItem(id: string): Promise<Item | undefined> {
     return this.itemRepository.findOne(id);
   }
 
+  async getItemParent(item: ItemModel) {
+    const itemE = await this.itemRepository.findOneOrFail(item.id);
+    return (await this.treeRepository.findAncestorsTree(itemE)).parent;
+  }
+
   async createItem(input: NewItemInput): Promise<Item> {
     const item = new Item();
     item.name = input.name;
     item.notes = input.notes;
+    if (input.parent) {
+      const parent = await this.itemRepository.findOneOrFail(input.parent);
+      item.parent = parent;
+    }
     return this.itemRepository.save(item);
   }
 }