feat(nestjs): migrate to NestJS

packages/server/src/modules/Customers/commands/DeleteCustomer.service.ts

@@ -0,0 +1,62 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { Knex } from 'knex';
+import { EventEmitter2 } from '@nestjs/event-emitter';
+import {
+  ICustomerDeletingPayload,
+  ICustomerEventDeletedPayload,
+} from '../types/Customers.types';
+import { UnitOfWork } from '@/modules/Tenancy/TenancyDB/UnitOfWork.service';
+import { Customer } from '../models/Customer';
+import { events } from '@/common/events/events';
+import { TenantModelProxy } from '@/modules/System/models/TenantBaseModel';
+
+@Injectable()
+export class DeleteCustomer {
+  /**
+   * @param {UnitOfWork} uow - Unit of work service.
+   * @param {EventEmitter2} eventPublisher - Event emitter service.
+   * @param {typeof Customer} contactModel - Customer model.
+   */
+  constructor(
+    private uow: UnitOfWork,
+    private eventPublisher: EventEmitter2,
+
+    @Inject(Customer.name)
+    private customerModel: TenantModelProxy<typeof Customer>,
+  ) {}
+
+  /**
+   * Deletes the given customer from the storage.
+   * @param {number} customerId - Customer ID.
+   * @return {Promise<void>}
+   */
+  public async deleteCustomer(customerId: number): Promise<void> {
+    // Retrieve the customer or throw not found service error.
+    const oldCustomer = await this.customerModel()
+      .query()
+      .findById(customerId)
+      .throwIfNotFound();
+    // .queryAndThrowIfHasRelations({
+    //   type: ERRORS.CUSTOMER_HAS_TRANSACTIONS,
+    // });
+
+    // Triggers `onCustomerDeleting` event.
+    await this.eventPublisher.emitAsync(events.customers.onDeleting, {
+      customerId,
+      oldCustomer,
+    } as ICustomerDeletingPayload);
+
+    // Deletes the customer and associated entities under UOW transaction.
+    return this.uow.withTransaction(async (trx: Knex.Transaction) => {
+      // Delete the customer from the storage.
+      await this.customerModel().query(trx).findById(customerId).delete();
+
+      // Throws `onCustomerDeleted` event.
+      await this.eventPublisher.emitAsync(events.customers.onDeleted, {
+        customerId,
+        oldCustomer,
+        trx,
+      } as ICustomerEventDeletedPayload);
+    });
+  }
+}