package.json

@@ -24,8 +24,11 @@
     "@nestjs/core": "^11.0.1",
     "@nestjs/mapped-types": "*",
     "@nestjs/platform-express": "^11.0.1",
+    "@nestjs/typeorm": "^11.0.0",
     "reflect-metadata": "^0.2.2",
-    "rxjs": "^7.8.1"
+    "rxjs": "^7.8.1",
+    "sqlite3": "^5.1.7",
+    "typeorm": "^0.3.28"
   },
   "devDependencies": {
     "@eslint/eslintrc": "^3.2.0",

src/app.module.ts

@@ -1,11 +1,10 @@
 import { Module } from '@nestjs/common';
 import { AppController } from './app.controller';
-import { ExpensesService } from './services/expenses.service';
-import { ExpensesController } from './controllers/expenses/expenses.controller';
+import { MerchantsModule } from './merchants/merchants.module';
 
 @Module({
-  imports: [],
-  controllers: [AppController, ExpensesController],
-  providers: [ExpensesService]
+  imports: [MerchantsModule],
+  controllers: [AppController],
+  providers: []
 })
 export class AppModule {}

src/controllers/expenses/expense.dto.ts

@@ -1,24 +0,0 @@
-import { PartialType } from '@nestjs/mapped-types';
-
-export class CreateExpenseDto {
-  date: Date;
-  cents: number;
-  categoryId: string;
-  merchantId?: string;
-  subcategoryIds?: string[];
-  tagIds?: string[];
-  description?: string;
-}
-
-export class UpdateExpenseDto extends PartialType(CreateExpenseDto) {}
-
-export class GetExpenseDto {
-  id: string;
-  date: Date;
-  cents: number;
-  category: string;
-  merchant?: string;
-  subcategories?: string[];
-  tags?: string[];
-  description?: string;
-}

src/controllers/expenses/expense.entities.ts

@@ -1,30 +0,0 @@
-export class Expense {
-  id: string;
-  date: Date;
-  cents: number;
-  categoryId: string;
-  merchantId?: string;
-  subcategoryIds: string[];
-  tagIds: string[];
-  description?: string;
-}
-
-export class Category {
-  id: string;
-  category: string;
-}
-
-export class SubCategory {
-  id: string;
-  subcategory: string;
-}
-
-export class Merchant {
-  id: string;
-  merchant: string;
-}
-
-export class Tag {
-  id: string;
-  tag: string;
-}

src/controllers/expenses/expenses.controller.ts

@@ -1,44 +0,0 @@
-import { Controller, Get, Post, Body, Patch, Param, Delete, NotFoundException, HttpCode } from '@nestjs/common';
-import { ExpensesService } from '../../services/expenses.service';
-import { CreateExpenseDto, UpdateExpenseDto } from './expense.dto';
-
-@Controller('expenses')
-export class ExpensesController {
-  constructor(private readonly expensesService: ExpensesService) {}
-
-  @Post()
-  create(@Body() createExpenseDto: CreateExpenseDto) {
-    return this.expensesService.create(createExpenseDto);
-  }
-
-  @Get()
-  findAll() {
-    return this.expensesService.findAll();
-  }
-
-  @Get(':id')
-  findOne(@Param('id') id: string) {
-    const expense = this.expensesService.findOne(id);
-    if (!expense) {
-      throw new NotFoundException();
-    }
-
-    return expense;
-  }
-
-  @Patch(':id')
-  update(@Param('id') id: string, @Body() updateExpenseDto: UpdateExpenseDto) {
-    const expense = this.expensesService.update(id, updateExpenseDto);
-    if (!expense) {
-      throw new NotFoundException();
-    }
-
-    return expense;
-  }
-
-  @Delete(':id')
-  @HttpCode(204)
-  remove(@Param('id') id: string) {
-    return this.expensesService.remove(id);
-  }
-}

src/merchants/dto/create-merchant.dto.ts

@@ -0,0 +1 @@
+export class CreateMerchantDto {}

src/merchants/dto/update-merchant.dto.ts

@@ -0,0 +1,4 @@
+import { PartialType } from '@nestjs/mapped-types';
+import { CreateMerchantDto } from './create-merchant.dto';
+
+export class UpdateMerchantDto extends PartialType(CreateMerchantDto) {}

src/merchants/entities/merchant.entity.ts

@@ -0,0 +1 @@
+export class Merchant {}

src/merchants/merchants.controller.spec.ts

@@ -0,0 +1,20 @@
+import { Test, TestingModule } from '@nestjs/testing';
+import { MerchantsController } from './merchants.controller';
+import { MerchantsService } from './merchants.service';
+
+describe('MerchantsController', () => {
+  let controller: MerchantsController;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      controllers: [MerchantsController],
+      providers: [MerchantsService]
+    }).compile();
+
+    controller = module.get<MerchantsController>(MerchantsController);
+  });
+
+  it('should be defined', () => {
+    expect(controller).toBeDefined();
+  });
+});

src/merchants/merchants.controller.ts

@@ -0,0 +1,34 @@
+import { Controller, Get, Post, Body, Patch, Param, Delete } from '@nestjs/common';
+import { MerchantsService } from './merchants.service';
+import { CreateMerchantDto } from './dto/create-merchant.dto';
+import { UpdateMerchantDto } from './dto/update-merchant.dto';
+
+@Controller('merchants')
+export class MerchantsController {
+  constructor(private readonly merchantsService: MerchantsService) {}
+
+  @Post()
+  create(@Body() createMerchantDto: CreateMerchantDto) {
+    return this.merchantsService.create(createMerchantDto);
+  }
+
+  @Get()
+  findAll() {
+    return this.merchantsService.findAll();
+  }
+
+  @Get(':id')
+  findOne(@Param('id') id: string) {
+    return this.merchantsService.findOne(+id);
+  }
+
+  @Patch(':id')
+  update(@Param('id') id: string, @Body() updateMerchantDto: UpdateMerchantDto) {
+    return this.merchantsService.update(+id, updateMerchantDto);
+  }
+
+  @Delete(':id')
+  remove(@Param('id') id: string) {
+    return this.merchantsService.remove(+id);
+  }
+}

src/merchants/merchants.module.ts

@@ -0,0 +1,9 @@
+import { Module } from '@nestjs/common';
+import { MerchantsService } from './merchants.service';
+import { MerchantsController } from './merchants.controller';
+
+@Module({
+  controllers: [MerchantsController],
+  providers: [MerchantsService]
+})
+export class MerchantsModule {}

src/merchants/merchants.service.spec.ts

@@ -0,0 +1,18 @@
+import { Test, TestingModule } from '@nestjs/testing';
+import { MerchantsService } from './merchants.service';
+
+describe('MerchantsService', () => {
+  let service: MerchantsService;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [MerchantsService]
+    }).compile();
+
+    service = module.get<MerchantsService>(MerchantsService);
+  });
+
+  it('should be defined', () => {
+    expect(service).toBeDefined();
+  });
+});

src/merchants/merchants.service.ts

@@ -0,0 +1,26 @@
+import { Injectable } from '@nestjs/common';
+import { CreateMerchantDto } from './dto/create-merchant.dto';
+import { UpdateMerchantDto } from './dto/update-merchant.dto';
+
+@Injectable()
+export class MerchantsService {
+  create(createMerchantDto: CreateMerchantDto) {
+    return 'This action adds a new merchant';
+  }
+
+  findAll() {
+    return `This action returns all merchants`;
+  }
+
+  findOne(id: number) {
+    return `This action returns a #${id} merchant`;
+  }
+
+  update(id: number, updateMerchantDto: UpdateMerchantDto) {
+    return `This action updates a #${id} merchant`;
+  }
+
+  remove(id: number) {
+    return `This action removes a #${id} merchant`;
+  }
+}

src/services/expenses.service.ts

@@ -1,141 +0,0 @@
-import { Injectable } from '@nestjs/common';
-import { Category, Expense, Merchant, SubCategory, Tag } from '../controllers/expenses/expense.entities';
-import { CreateExpenseDto, GetExpenseDto, UpdateExpenseDto } from '../controllers/expenses/expense.dto';
-import { randomUUID } from 'node:crypto';
-
-@Injectable()
-export class ExpensesService {
-  private categories: Category[] = [
-    {
-      id: '1',
-      category: 'Category 1'
-    }
-  ];
-  private merchants: Merchant[] = [
-    {
-      id: '1',
-      merchant: 'Merchant 1'
-    }
-  ];
-  private subcategories: SubCategory[] = [
-    {
-      id: '1',
-      subcategory: 'Subcategory 1'
-    },
-    {
-      id: '2',
-      subcategory: 'Subcategory 2'
-    }
-  ];
-  private tags: Tag[] = [
-    {
-      id: '1',
-      tag: 'Tag 1'
-    },
-    {
-      id: '2',
-      tag: 'Tag 2'
-    }
-  ];
-  private expenses: Expense[] = [
-    {
-      id: '2aa94170-2c57-4c4f-a1e7-13544ba72917',
-      date: new Date('2025-12-01'),
-      cents: 15443,
-      categoryId: '1',
-      merchantId: '1',
-      subcategoryIds: ['1', '2'],
-      tagIds: ['1', '2'],
-      description: 'Full existing expense'
-    },
-    {
-      id: '0708e7f7-3a2a-4b93-81da-38954925ca78',
-      date: new Date('2025-12-02'),
-      cents: 8723,
-      categoryId: '1',
-      subcategoryIds: [],
-      tagIds: [],
-      description: 'Partial existing expense'
-    }
-  ];
-
-  public create(createExpenseDto: CreateExpenseDto) {
-    const expense = {
-      id: randomUUID(),
-      date: new Date(createExpenseDto.date),
-      cents: createExpenseDto.cents,
-      categoryId: createExpenseDto.categoryId,
-      merchantId: createExpenseDto.merchantId,
-      subcategoryIds: createExpenseDto.subcategoryIds ?? [],
-      tagIds: createExpenseDto.tagIds ?? [],
-      description: createExpenseDto.description
-    } as Expense;
-    this.expenses.push(expense);
-
-    return this.mapExpense(expense);
-  }
-
-  public findAll() {
-    return this.expenses.map((expense) => {
-      return this.mapExpense(expense);
-    });
-  }
-
-  public findOne(id: string) {
-    const expense = this.getExpense(id);
-    return expense ? this.mapExpense(expense) : undefined;
-  }
-
-  public update(id: string, updateExpenseDto: UpdateExpenseDto) {
-    let index;
-    const expense = this.expenses.find((exp, idx) => {
-      if (exp.id === id) {
-        index = idx;
-        return exp;
-      }
-    });
-
-    if (expense && index) {
-      this.expenses[index] = {
-        ...expense,
-        ...updateExpenseDto
-      };
-
-      return this.mapExpense(this.expenses[index]);
-    }
-
-    return undefined;
-  }
-
-  public remove(id: string) {
-    this.expenses = this.expenses.filter((expense) => expense.id !== id);
-  }
-
-  private getExpense(id: string) {
-    return this.expenses.find((expense) => expense.id === id);
-  }
-
-  private getSubcategories(ids: string[]) {
-    return this.subcategories.filter((sub) => ids.includes(sub.id)).map((s) => s.subcategory);
-  }
-
-  private getTags(ids: string[]) {
-    return this.tags.filter((tag) => ids.includes(tag.id)).map((t) => t.tag);
-  }
-
-  private mapExpense(expense: Expense) {
-    const category = this.categories.find((category) => category.id === expense.categoryId);
-    const merchant = this.merchants.find((merchant) => merchant.id === expense.merchantId);
-
-    return {
-      id: expense.id,
-      date: expense.date,
-      cents: expense.cents,
-      category: category?.category,
-      merchant: merchant?.merchant,
-      subcategories: this.getSubcategories(expense.subcategoryIds),
-      tags: this.getTags(expense.tagIds),
-      description: expense.description
-    } as GetExpenseDto;
-  }
-}