无法导航到同级路由器

Question

我的对话路由.module.ts：

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';

import { ConversationComponent } from './conversation.component';
import { ConversationDetailComponent } from './conversation-detail/conversation-detail.component';

const routes: Routes = [
  {
    path: '',
    component: ConversationComponent,
    children: [
      {
        path: 'detail',
        component: ConversationDetailComponent
      },
      {
        path: 'detail/:conversation_id',
        component: ConversationDetailComponent
      },
      {
        path: 'add-conversation',
        component: ConversationDetailComponent,
        data: {
          addNew: true
        }
      },
      {
        path: '',
        redirectTo: 'detail'
      }
    ]
  }
];

@NgModule({
  imports: [RouterModule.forChild(routes)],
  exports: [RouterModule]
})
export class ConversationRoutingModule { }

并在带有路由器“对话/添加对话”的session-detail.component.ts中：

this.router.navigate(['../detail'], {relativeTo: this.route});

它只是导航到根默认路由器，控制台日志什么也没有。

我正在使用angular 6.0.0和延迟模块加载。