refactor: migrate credit note and vendor credit services to nestjs

packages/server-nest/src/modules/CreditNotes/queries/GetCreditNote.service.ts

@@ -0,0 +1,39 @@
+import { TransformerInjectable } from '@/modules/Transformer/TransformerInjectable.service';
+import { ERRORS } from '../constants';
+import { CreditNoteTransformer } from './CreditNoteTransformer';
+import { Inject, Injectable } from '@nestjs/common';
+import { CreditNote } from '../models/CreditNote';
+import { ServiceError } from '@/modules/Items/ServiceError';
+
+@Injectable()
+export class GetCreditNote {
+  constructor(
+    private readonly transformer: TransformerInjectable,
+
+    @Inject(CreditNote.name)
+    private readonly creditNoteModel: typeof CreditNote,
+  ) {}
+
+  /**
+   * Retrieve the credit note graph.
+   * @param {number} tenantId
+   * @param {number} creditNoteId
+   * @returns
+   */
+  public async getCreditNote(creditNoteId: number) {
+    // Retrieve the vendor credit model graph.
+    const creditNote = await this.creditNoteModel
+      .query()
+      .findById(creditNoteId)
+      .withGraphFetched('entries.item')
+      .withGraphFetched('customer')
+      .withGraphFetched('branch')
+      .withGraphFetched('attachments');
+
+    if (!creditNote) {
+      throw new ServiceError(ERRORS.CREDIT_NOTE_NOT_FOUND);
+    }
+    // Transforms the credit note model to POJO.
+    return this.transformer.transform(creditNote, new CreditNoteTransformer());
+  }
+}