feat(nestjs): migrate to NestJS

packages/server/src/modules/Expenses/commands/PublishExpense.service.ts

@@ -0,0 +1,74 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { Knex } from 'knex';
+import {
+  IExpensePublishingPayload,
+  IExpenseEventPublishedPayload,
+} from '../interfaces/Expenses.interface';
+import { CommandExpenseValidator } from './CommandExpenseValidator.service';
+import { Expense } from '../models/Expense.model';
+import { UnitOfWork } from '@/modules/Tenancy/TenancyDB/UnitOfWork.service';
+import { events } from '@/common/events/events';
+import { EventEmitter2 } from '@nestjs/event-emitter';
+import { TenantModelProxy } from '@/modules/System/models/TenantBaseModel';
+
+@Injectable()
+export class PublishExpense {
+  /**
+   * @param {EventEmitter2} eventPublisher - Event emitter.
+   * @param {UnitOfWork} uow - Unit of work.
+   * @param {CommandExpenseValidator} validator - Command expense validator.
+   * @param {typeof Expense} expenseModel - Expense model.
+   */
+  constructor(
+    private readonly eventPublisher: EventEmitter2,
+    private readonly uow: UnitOfWork,
+    private readonly validator: CommandExpenseValidator,
+
+    @Inject(Expense.name)
+    private readonly expenseModel: TenantModelProxy<typeof Expense>,
+  ) {}
+
+  /**
+   * Publish the given expense.
+   * @param {number} expenseId
+   * @param {ISystemUser} authorizedUser
+   * @return {Promise<void>}
+   */
+  public async publishExpense(expenseId: number) {
+    // Retrieves the old expense or throw not found error.
+    const oldExpense = await this.expenseModel()
+      .query()
+      .findById(expenseId)
+      .throwIfNotFound();
+
+    // Validate the expense whether is published before.
+    this.validator.validateExpenseIsNotPublished(oldExpense);
+
+    // Publishes expense transactions with associated transactions
+    // under unit-of-work envirement.
+    return this.uow.withTransaction(async (trx: Knex.Transaction) => {
+      // Trigggers `onExpensePublishing` event.
+      await this.eventPublisher.emitAsync(events.expenses.onPublishing, {
+        trx,
+        oldExpense,
+      } as IExpensePublishingPayload);
+
+      // Publish the given expense on the storage.
+      await this.expenseModel().query().findById(expenseId).modify('publish');
+
+      // Retrieve the new expense after modification.
+      const expense = await this.expenseModel()
+        .query()
+        .findById(expenseId)
+        .withGraphFetched('categories');
+
+      // Triggers `onExpensePublished` event.
+      await this.eventPublisher.emitAsync(events.expenses.onPublished, {
+        expenseId,
+        oldExpense,
+        expense,
+        trx,
+      } as IExpenseEventPublishedPayload);
+    });
+  }
+}