refactor: split the services to multiple service classes (#202)

packages/server/src/services/Purchases/Bills/GetBillPayments.ts

@@ -0,0 +1,35 @@
+import { Service, Inject } from 'typedi';
+import TenancyService from '@/services/Tenancy/TenancyService';
+import { BillPaymentTransactionTransformer } from '../BillPayments/BillPaymentTransactionTransformer';
+import { TransformerInjectable } from '@/lib/Transformer/TransformerInjectable';
+
+@Service()
+export class GetBillPayments {
+  @Inject()
+  private tenancy: TenancyService;
+
+  @Inject()
+  private transformer: TransformerInjectable;
+
+  /**
+   * Retrieve the specific bill associated payment transactions.
+   * @param {number} tenantId
+   * @param {number} billId
+   * @returns {}
+   */
+  public getBillPayments = async (tenantId: number, billId: number) => {
+    const { BillPaymentEntry } = this.tenancy.models(tenantId);
+
+    const billsEntries = await BillPaymentEntry.query()
+      .where('billId', billId)
+      .withGraphJoined('payment.paymentAccount')
+      .withGraphJoined('bill')
+      .orderBy('payment:paymentDate', 'ASC');
+
+    return this.transformer.transform(
+      tenantId,
+      billsEntries,
+      new BillPaymentTransactionTransformer()
+    );
+  };
+}