Proof of concept

cats.service.ts

@@ -1,24 +0,0 @@
-import { Injectable } from "@nestjs/common";
-import { InjectRepository } from "@nestjs/typeorm";
-import { Repository } from "typeorm";
-import { Cat } from "./src/cats/cats.entity";
-
-@Injectable()
-export class CatsService {
-  constructor(
-    @InjectRepository(Cat)
-    private catsRepository: Repository<Cat>,
-  ) {}
-
-  findAll(): Promise<Cat[]> {
-    return this.catsRepository.find();
-  }
-
-  findOne(id: number): Promise<Cat | null> {
-    return this.catsRepository.findOneBy({ id });
-  }
-
-  async remove(id: number): Promise<void> {
-    await this.catsRepository.delete(id)
-  }
-}

package-lock.json

@@ -11,6 +11,7 @@
       "dependencies": {
         "@nestjs/common": "^10.0.0",
         "@nestjs/core": "^10.0.0",
+        "@nestjs/devtools-integration": "^0.1.5",
         "@nestjs/platform-express": "^10.0.0",
         "@nestjs/typeorm": "^10.0.0",
         "pg": "^8.11.3",
@@ -1639,6 +1640,20 @@
         }
       }
     },
+    "node_modules/@nestjs/devtools-integration": {
+      "version": "0.1.5",
+      "resolved": "https://registry.npmjs.org/@nestjs/devtools-integration/-/devtools-integration-0.1.5.tgz",
+      "integrity": "sha512-iwxvfxa3kzOulG/Fje82Ww80OVsA8rzYR+UAEKrdGExRRGQRGQ0+bHfG0XLlPG3XIuM5J2MRMo7x1bN8ZIs9Gg==",
+      "dependencies": {
+        "chalk": "^4.1.2",
+        "node-fetch": "^2.6.9"
+      },
+      "peerDependencies": {
+        "@nestjs/common": "^9.3.7 || ^10.0.0",
+        "@nestjs/core": "^9.3.7 || ^10.0.0",
+        "reflect-metadata": "^0.1.12"
+      }
+    },
     "node_modules/@nestjs/platform-express": {
       "version": "10.2.5",
       "resolved": "https://registry.npmjs.org/@nestjs/platform-express/-/platform-express-10.2.5.tgz",

package.json

@@ -8,6 +8,7 @@
   "scripts": {
     "build": "nest build",
     "format": "prettier --write \"src/**/*.ts\" \"test/**/*.ts\"",
+    "typeorm": "typeorm-ts-node-esm",
     "start": "nest start",
     "start:dev": "nest start --watch",
     "start:debug": "nest start --debug --watch",
@@ -22,6 +23,7 @@
   "dependencies": {
     "@nestjs/common": "^10.0.0",
     "@nestjs/core": "^10.0.0",
+    "@nestjs/devtools-integration": "^0.1.5",
     "@nestjs/platform-express": "^10.0.0",
     "@nestjs/typeorm": "^10.0.0",
     "pg": "^8.11.3",

src/app.module.ts

@@ -1,17 +1,21 @@
 import { Module } from '@nestjs/common';
 import { DataSource } from 'typeorm';
 import { TypeOrmModule, TypeOrmModuleOptions } from '@nestjs/typeorm'; // DEBUG: Is this necessary? Docs unclear.
+import { DevtoolsModule } from '@nestjs/devtools-integration';
 import { AppController } from './app.controller';
 import { AppService } from './app.service';
 import { Cat } from './cats/cats.entity';
 import { CatsModule } from './cats/cats.module';
 
+console.debug(`[AppModule] Starting...`)
+
 let dbConfig: TypeOrmModuleOptions;
 
 if ( process.env.NODE_ENV === 'production' ) {
   dbConfig = {
     type: 'sqlite',
-    database: 'database/database_development.sqlite3'
+    database: 'database/database_development.sqlite3',
+    entities: [Cat],
   }
 } else {
   dbConfig = {
@@ -22,9 +26,12 @@ if ( process.env.NODE_ENV === 'production' ) {
 }
 
 @Module({
-  imports: [TypeOrmModule.forRoot(dbConfig), CatsModule],
+  imports: [
+    TypeOrmModule.forRoot(dbConfig),
+    DevtoolsModule.register({ http: process.env.NODE_ENV !== 'production' }),
+    CatsModule
+  ],
   controllers: [AppController],
   providers: [AppService],
 })
-
 export class AppModule {}

src/cats/cats.controller.ts

@@ -4,10 +4,13 @@ import { Cat } from "./cats.entity";
 
 @Controller('cats')
 export class CatsController {
-  constructor(private catsService: CatsService) {};
+  constructor(private catsService: CatsService) {
+    console.debug("[cats controller] Starting...");
+  }
 
   @Get()
   findAll(): Promise<Cat[]> {
+    console.debug("[ctrl findAll] Starting...");
     return this.catsService.findAll();
   }
 

src/cats/cats.entity.ts

@@ -1,5 +1,7 @@
 import { Entity, Column, PrimaryGeneratedColumn } from "typeorm";
 
+console.debug('[cats entity] Starting...')
+
 @Entity()
 export class Cat {
   @PrimaryGeneratedColumn()

src/cats/cats.module.ts

@@ -4,6 +4,8 @@ import { CatsController } from "./cats.controller";
 import { CatsService } from "./cats.service";
 import { Cat } from "./cats.entity";
 
+console.debug("[cats module] Starting...");
+
 @Module({
   imports: [TypeOrmModule.forFeature([Cat])],
   providers: [CatsService],

src/cats/cats.service.ts

@@ -8,9 +8,12 @@ export class CatsService {
   constructor(
     @InjectRepository(Cat)
     private catsRepository: Repository<Cat>,
-  ) {}
+  ) {
+    console.debug("[cats service] Starting...");
+  }
 
   findAll(): Promise<Cat[]> {
+    console.log("[svc findAll] Starting...")
     return this.catsRepository.find();
   }
 

src/main.ts

@@ -2,7 +2,8 @@ import { NestFactory } from '@nestjs/core';
 import { AppModule } from './app.module';
 
 async function bootstrap() {
-  const app = await NestFactory.create(AppModule);
+  console.debug("[bootstrap] Starting...")
+  const app = await NestFactory.create(AppModule, { snapshot: true });
   await app.listen(3000);
 }
 bootstrap();