新建一个demoRoles的守卫，nest generate guard demoRoles core/guards

src/core/guards/demo-roles.guard.spec.ts

@@ -0,0 +1,7 @@
+import { DemoRolesGuard } from './demo-roles.guard';
+
+describe('DemoRolesGuard', () => {
+  it('should be defined', () => {
+    expect(new DemoRolesGuard()).toBeDefined();
+  });
+});

src/core/guards/demo-roles.guard.ts

@@ -0,0 +1,11 @@
+import { CanActivate, ExecutionContext, Injectable } from '@nestjs/common';
+import { Observable } from 'rxjs';
+
+@Injectable()
+export class DemoRolesGuard implements CanActivate {
+  canActivate(
+    context: ExecutionContext,
+  ): boolean | Promise<boolean> | Observable<boolean> {
+    return true;
+  }
+}