added expenses resource

src/expenses/expenses.service.ts

@@ -0,0 +1,35 @@
+import { Injectable } from '@nestjs/common';
+import { CreateExpenseDto } from './dto/create-expense.dto';
+import { UpdateExpenseDto } from './dto/update-expense.dto';
+import { ExpenseDataService } from './expense-data.service';
+import { Expense } from './entities/expense.entity';
+
+@Injectable()
+export class ExpensesService {
+  public constructor(private expenseDataService: ExpenseDataService) { }
+
+  public async findAll(): Promise<Expense[]> {
+    return await this.expenseDataService.getAll();
+  }
+
+  public async findById(id: string): Promise<Expense> {
+    const expense = await this.expenseDataService.getById(id);
+    if (!expense) {
+      throw new Error('No expense found');
+    }
+
+    return expense;
+  }
+
+  public async create(expense: CreateExpenseDto): Promise<Expense> {
+    return await this.expenseDataService.create(expense);
+  }
+
+  public async update(expense: UpdateExpenseDto): Promise<Expense> {
+    return await this.expenseDataService.update(expense);
+  }
+
+  public async remove(id: string): Promise<void> {
+    await this.expenseDataService.delete(id);
+  }
+}