refactor: credit notes and vendor credits to Nestjs

packages/server-nest/src/modules/CreditNoteRefunds/queries/GetCreditNoteRefunds.service.ts

@@ -0,0 +1,37 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { TransformerInjectable } from '@/modules/Transformer/TransformerInjectable.service';
+import { RefundCreditNote } from '../models/RefundCreditNote';
+import { RefundCreditNoteTransformer } from '@/modules/CreditNotes/queries/RefundCreditNoteTransformer';
+import { IRefundCreditNotePOJO } from '../types/CreditNoteRefunds.types';
+
+@Injectable()
+export class ListCreditNoteRefunds {
+  constructor(
+    private readonly transformer: TransformerInjectable,
+
+    @Inject(RefundCreditNote.name)
+    private readonly refundCreditNoteModel: typeof RefundCreditNote,
+  ) {}
+
+  /**
+   * Retrieve the credit note graph.
+   * @param {number} creditNoteId
+   * @returns {Promise<IRefundCreditNotePOJO[]>}
+   */
+  public async getCreditNoteRefunds(
+    creditNoteId: number,
+  ): Promise<IRefundCreditNotePOJO[]> {
+    // Retrieve refund credit notes associated to the given credit note.
+    const refundCreditTransactions = await this.refundCreditNoteModel
+      .query()
+      .where('creditNoteId', creditNoteId)
+      .withGraphFetched('creditNote')
+      .withGraphFetched('fromAccount');
+
+    // Transforms refund credit note models to POJO objects.
+    return this.transformer.transform(
+      refundCreditTransactions,
+      new RefundCreditNoteTransformer(),
+    );
+  }
+}