connect to the database

src/app.module.ts

@@ -1,9 +1,28 @@
 import { Module } from '@nestjs/common';
+import { ConfigModule, ConfigService } from '@nestjs/config';
+import { MongooseModule } from '@nestjs/mongoose';
 import { AppController } from './app.controller';
 import { AppService } from './app.service';
+import Configuration from './config/configuration';
 
 @Module({
-  imports: [],
+  imports: [
+    ConfigModule.forRoot({
+      load: [Configuration],
+      isGlobal: true,
+    }),
+    MongooseModule.forRootAsync({
+      imports: [ConfigModule],
+      inject: [ConfigService],
+      useFactory: async (config: ConfigService) => ({
+        uri: `mongodb://${config.get<string>(
+          'database.url',
+        )}:${config.get<number>('database.port')}/${config.get<string>(
+          'database.name',
+        )}`,
+      }),
+    }),
+  ],
   controllers: [AppController],
   providers: [AppService],
 })

src/config/Configuration.ts

@@ -0,0 +1,7 @@
+export default () => ({
+  database: {
+    url: process.env.DATABASE_URL || 'localhost',
+    port: parseInt(process.env.DATABASE_PORT, 10) || 27017,
+    name: process.env.DATABASE_NAME || 'aman',
+  },
+});