refactor: items services to Nestjs

packages/server-nest/src/modules/Items/GetItem.service.ts

@@ -0,0 +1,46 @@
+import { EventEmitter2 } from '@nestjs/event-emitter';
+import { Inject, Injectable } from '@nestjs/common';
+import { Item } from './models/Item';
+import { events } from '@/common/events/events';
+import { TransformerInjectable } from '../Transformer/TransformerInjectable.service';
+import { ItemTransformer } from './Item.transformer';
+
+@Injectable()
+export class GetItemService {
+  constructor(
+    @Inject(Item)
+    private itemModel: typeof Item,
+    private eventEmitter2: EventEmitter2,
+    private transformerInjectable: TransformerInjectable,
+  ) {}
+
+  /**
+   * Retrieve the item details of the given id with associated details.
+   * @param {number} tenantId - The tenant id.
+   * @param {number} itemId - The item id.
+   */
+  public async getItem(itemId: number): Promise<any> {
+    const item = await this.itemModel
+      .query()
+      .findById(itemId)
+      .withGraphFetched('sellAccount')
+      .withGraphFetched('inventoryAccount')
+      .withGraphFetched('category')
+      .withGraphFetched('costAccount')
+      .withGraphFetched('itemWarehouses.warehouse')
+      .withGraphFetched('sellTaxRate')
+      .withGraphFetched('purchaseTaxRate')
+      .throwIfNotFound();
+
+    const transformed = await this.transformerInjectable.transform(
+      item,
+      new ItemTransformer(),
+    );
+    const eventPayload = { itemId };
+
+    // Triggers the `onItemViewed` event.
+    await this.eventEmitter2.emitAsync(events.item.onViewed, eventPayload);
+
+    return transformed;
+  }
+}