Angular 4 - 如何正确使用.find（）？

Question

我已阅读了大部分与此类似的问题，但仍然不明白如何在我的应用中使.find()工作。

我有API服务：

export class VehicleService { 
    private defUrl = 'API'; 

    constructor(private http: Http) { } 

    getVehicleByVehicleId(vehicleid?: any) { 
    const url = (!vehicleid) ? this.defUrl : 'API1&vehicle_id=' + vehicleid; 
    return this.http.get(url) 
     .map(res => res.json()); 
    } 


    searchVehicleId(description?: string) { 
    const url = (!description) ? this.defUrl : 'API2&description=' + description; 
    return this.http.get(url) 
     .map(res => res.json().vehicles); 
    } 
} 

组件

export class VehicleComponent implements OnInit { 

    ngOnInit() { 

    this.searchQuery = new FormGroup({ 
     vehicleDescription: new FormControl('', Validators.required) 
    }); 
    } 


    constructor(private vehicleService: VehicleService) { } 

    public fleet: Fleet[]; 
    public description: Description[]; 
    public searchQuery: FormGroup; 
    public searchVehicleId: any; 


    public searchByVehicleId(searchQuery) { 
    this.vehicleService 
     .searchVehicleId(searchQuery.value.vehicleDescription) 
     .subscribe(searchQuery => { 
     this.description = searchQuery; 
     this.searchVehicleId = this.description.find() // <= HOW TO IMPLEMENT THIS? 
    this.vehicleService 
     .getVehicleByVehicleId(this.searchVehicleId) 
     .subscribe(searchQuery => { 
     this.vehicle = searchQuery; 
     }) 
     }); 
    } 
interface Vehicle { 
    status: number; 
    dallases: Vehicle[]; 
} 

interface VehicleDetails { 
    vehicle_id: number; 
    dallassettings: string; 
    dallasupdated: string; 
    dallas_list: DallasList[]; 
} 

interface DallasList { 
    number: number; 
    auth: number; 
} 

////////////////////////////////// 
////////////////////////////////// 

interface Description { 
    vehicles: DescriptionDetails[]; 
} 

interface DescriptionDetails { 
    id: number; 
    custom_description: string; 
    description: string; 
} 

API2

{ 
    "vehicles": [{ 
     "description": "SKODA ROOMSTER", 
     "id": 123456, 
     "custom_description": "" 
    }, { 
     "description": "SKODA ROOMSTER", 
     "id": 123456789, 
     "custom_description": "" 
    }] 
} 

所以，我在这里做的是：通过description内FormGroup - vehicleDescription字段至searchByVehicleId方法。在这里我想找到id通过vehicleDescription velue（它是API2中的"description"字段）。当我们找到id时，我们用它进一步在this.vehicleService.getVehicleByVehicleId ...

主要问题是 - 我不知道，如何正确实施.find()。

由于

Answer 1

MDN docs的：

this.searchVehicleId = this.description.find(x => x.id === someId);