fix(sample): use clients module in the grpc sample

Author: kamilmysliwiec

sample/04-grpc/src/hero/hero.controller.ts

@@ -1,7 +1,6 @@
-import { Controller, Get, OnModuleInit } from '@nestjs/common';
-import { Client, ClientGrpc, GrpcMethod } from '@nestjs/microservices';
+import { Controller, Get, Inject, OnModuleInit } from '@nestjs/common';
+import { ClientGrpc, GrpcMethod } from '@nestjs/microservices';
 import { Observable } from 'rxjs';
-import { grpcClientOptions } from '../grpc-client.options';
 import { HeroById } from './interfaces/hero-by-id.interface';
 import { Hero } from './interfaces/hero.interface';
 
@@ -11,11 +10,10 @@ interface HeroService {
 
 @Controller()
 export class HeroController implements OnModuleInit {
-  @Client(grpcClientOptions)
-  private readonly client: ClientGrpc;
-
   private heroService: HeroService;
 
+  constructor(@Inject('HERO_PACKAGE') private readonly client: ClientGrpc) {}
+
   onModuleInit() {
     this.heroService = this.client.getService<HeroService>('HeroService');
   }

sample/04-grpc/src/hero/hero.module.ts

@@ -1,7 +1,17 @@
 import { Module } from '@nestjs/common';
+import { ClientsModule } from '@nestjs/microservices';
+import { grpcClientOptions } from '../grpc-client.options';
 import { HeroController } from './hero.controller';
 
 @Module({
+  imports: [
+    ClientsModule.register([
+      {
+        name: 'HERO_PACKAGE',
+        ...grpcClientOptions,
+      },
+    ]),
+  ],
   controllers: [HeroController],
 })
 export class HeroModule {}