feat(nestjs): migrate to NestJS

packages/server/src/modules/Items/DeleteItem.service.ts

@@ -0,0 +1,67 @@
+import { Injectable, Inject } from '@nestjs/common';
+import { Knex } from 'knex';
+import { EventEmitter2 } from '@nestjs/event-emitter';
+import {
+  IItemEventDeletedPayload,
+  IItemEventDeletingPayload,
+} from '@/interfaces/Item';
+import { events } from '@/common/events/events';
+import { Item } from './models/Item';
+import { ERRORS } from './Items.constants';
+import { UnitOfWork } from '../Tenancy/TenancyDB/UnitOfWork.service';
+import { TenantModelProxy } from '../System/models/TenantBaseModel';
+
+@Injectable()
+export class DeleteItemService {
+  /**
+   * Constructor for the class.
+   * @param {EventEmitter2} eventEmitter - Event emitter for publishing item deletion events.
+   * @param {UnitOfWork} uow - Unit of Work for tenant database transactions.
+   * @param {typeof Item} itemModel - The Item model class for database operations.
+   */
+  constructor(
+    private readonly eventEmitter: EventEmitter2,
+    private readonly uow: UnitOfWork,
+
+    @Inject(Item.name)
+    private readonly itemModel: TenantModelProxy<typeof Item>,
+  ) {}
+
+  /**
+   * Delete the given item from the storage.
+   * @param {number} itemId - Item id.
+   * @return {Promise<void>}
+   */
+  public async deleteItem(
+    itemId: number,
+    trx?: Knex.Transaction,
+  ): Promise<void> {
+    // Retrieve the given item or throw not found service error.
+    const oldItem = await this.itemModel()
+      .query()
+      .findById(itemId)
+      .throwIfNotFound();
+    // .queryAndThrowIfHasRelations({
+    //   type: ERRORS.ITEM_HAS_ASSOCIATED_TRANSACTIONS,
+    // });
+
+    // Delete item in unit of work.
+    return this.uow.withTransaction(async (trx: Knex.Transaction) => {
+      // Triggers `onItemDeleting` event.
+      await this.eventEmitter.emitAsync(events.item.onDeleting, {
+        trx,
+        oldItem,
+      } as IItemEventDeletingPayload);
+
+      // Deletes the item.
+      await this.itemModel().query(trx).findById(itemId).delete();
+
+      // Triggers `onItemDeleted` event.
+      await this.eventEmitter.emitAsync(events.item.onDeleted, {
+        itemId,
+        oldItem,
+        trx,
+      } as IItemEventDeletedPayload);
+    }, trx);
+  }
+}