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

packages/server/src/services/Sales/Receipts/GetSaleReceipt.ts

@@ -0,0 +1,42 @@
+import { Inject, Service } from 'typedi';
+import { SaleReceiptTransformer } from './SaleReceiptTransformer';
+import HasTenancyService from '@/services/Tenancy/TenancyService';
+import { TransformerInjectable } from '@/lib/Transformer/TransformerInjectable';
+import { SaleReceiptValidators } from './SaleReceiptValidators';
+
+@Service()
+export class GetSaleReceipt {
+  @Inject()
+  private tenancy: HasTenancyService;
+
+  @Inject()
+  private transformer: TransformerInjectable;
+
+  @Inject()
+  private validators: SaleReceiptValidators;
+
+  /**
+   * Retrieve sale receipt with associated entries.
+   * @param {Integer} saleReceiptId
+   * @return {ISaleReceipt}
+   */
+  public async getSaleReceipt(tenantId: number, saleReceiptId: number) {
+    const { SaleReceipt } = this.tenancy.models(tenantId);
+
+    const saleReceipt = await SaleReceipt.query()
+      .findById(saleReceiptId)
+      .withGraphFetched('entries.item')
+      .withGraphFetched('customer')
+      .withGraphFetched('depositAccount')
+      .withGraphFetched('branch');
+
+    // Valdiates the sale receipt existance.
+    this.validators.validateReceiptExistance(saleReceipt);
+
+    return this.transformer.transform(
+      tenantId,
+      saleReceipt,
+      new SaleReceiptTransformer()
+    );
+  }
+}