Project Initialization

apps/edr-freight-api/src/modules/trains/trains.service.ts

@@ -0,0 +1,29 @@
+import { Injectable, NotFoundException } from '@nestjs/common';
+
+import { CreateTrainDto } from './dto/create-train.dto';
+import { Train } from './entities/train.entity';
+import { TrainsRepository } from './trains.repository';
+
+@Injectable()
+export class TrainsService {
+  constructor(private readonly trainsRepository: TrainsRepository) {}
+
+  /** Register a new train in the fleet. */
+  create(dto: CreateTrainDto): Promise<Train> {
+    return this.trainsRepository.create(dto);
+  }
+
+  /** List every active train. */
+  findAll(): Promise<Train[]> {
+    return this.trainsRepository.findAll({ order: { code: 'ASC' } });
+  }
+
+  /** Get a single train by ID. */
+  async findById(id: string): Promise<Train> {
+    const train = await this.trainsRepository.findById(id);
+    if (!train) {
+      throw new NotFoundException(`Train ${id} not found`);
+    }
+    return train;
+  }
+}