add folder operation and use createQueryRunner

src/Operations/operations.services.ts

@@ -0,0 +1,54 @@
+import { BadRequestException, Injectable } from '@nestjs/common';
+import { StudentService } from 'src/alumno/student.service';
+import { DetalleServicioService } from 'src/detalle_servicio/detalle_servicio.service';
+import { DataSource } from 'typeorm';
+import { chargePrintDto } from './dto/operations.dto';
+import { CreateDetalleServicioDto } from 'src/detalle_servicio/dto/create-detalle_servicio.dto';
+
+@Injectable()
+export class OperationsService {
+  constructor(
+    private readonly dataSource: DataSource,
+    private readonly studentService: StudentService,
+    private readonly detalleServicioService: DetalleServicioService,
+  ) {}
+
+  async chargePrint(data: chargePrintDto, userId: number) {
+    const { monto, id_cuenta } = data;
+
+    const queryRunner = this.dataSource.createQueryRunner();
+    await queryRunner.connect();
+    await queryRunner.startTransaction();
+
+    try {
+      const credit = await this.studentService.GetCredit(id_cuenta);
+
+      if (credit < monto) {
+        throw new BadRequestException('Crédito insuficiente');
+      }
+
+      const detalleData: CreateDetalleServicioDto = {
+        ...data,
+        id_servicio: 1,
+        id_usuario: userId,
+        fecha_operacion: new Date(),
+      };
+
+      await this.detalleServicioService.Create(detalleData, queryRunner.manager);
+
+      await this.studentService.UpdateCredit(
+        id_cuenta,
+        monto,
+        queryRunner.manager,
+      );
+
+      await queryRunner.commitTransaction();
+      return { message: 'correct' };
+    } catch (error) {
+      await queryRunner.rollbackTransaction();
+      return { message: 'error', error: error.message };
+    } finally {
+      await queryRunner.release();
+    }
+  }
+}