Question

我不明白这里有什么特别的。我试图简单地加载一个名为asset的类的所有对象，但是当我尝试保存结果时，我不断收到此错误。

asset.service.ts（24,23）：提供的参数与调用目标的任何签名都不匹配

我有以下代码

assets.component.ts

export class AssetsComponent implements OnInit {

  constructor(private assetService: AssetService, private errorService: ErrorService) { }

  assets: Asset[] = [];

  ngOnInit() {
    this.assetService.getAssets()
      .subscribe(
        assets => {
          console.log('assets is', assets);
          this.assets = assets;
          this.assetService.assets = assets;
        },
        error => this.errorService.handleError(error)
      )
  }

}

asset.service.ts

@Injectable()
export class AssetService {
  @Output() asset: Asset;
  assets: Asset[] = [];

  constructor(private _http: Http) { }

  getAssets() {
    return this._http.get('http://localhost:3000/asset')
      .map(response => {
        const data = response.json().obj;
        console.log('getAssets data from response is');
        console.log(data);
        let objs: any[] = [];
        for (let i = 0; i < data.length; i++) {
          console.log('Asset Data here is', data[i]);
          let asset = new Asset(data[i].name, data[i].mimetype, data[i].filename, data[i].local_path, data[i].size);
          objs.push(asset);
        }
        return objs;
      })
      .catch(error => Observable.throw(error.json()));
  }

}

在我的 assets.js 路线中（在使用快递的节点中）我有

router.get('/', function(req, res, next) {
  Asset.find()
    //.populate('name', 'filename')
    .exec(function(err, docs) {
      if (err) {
        return res.status(404).json({
          title: 'An Error occured',
          error: err
        });
      }
      console.log('node get docs are');
      console.log(docs);
      res.status(200).json({
        asset: 'Success',
        obj: docs
      });
    });
});

我在Angular2中的asset.ts模型看起来像：

export class Asset {
  name: string;
  mimetype: string;
  filename: string;
  local_path: string;
  size: number;
  s3loc: string;
  thumb_local_path: string;
  proxy_local_path: string;
  thumb_s3_path: string;
  proxy_s3_path: string;

... constructor follows...

Answer 1

所以这就像预期的那样简单，但我在搜索时没有看到这个答案。即使我知道这个特定的getAssets调用何时运行，它通常不会在响应中返回所有字段，为此工作，所有字段必须在新资产部分中计算对于在资产服务中创建的对象。

所以上面一行：

let asset = new Asset(data[i].name, data[i].mimetype, data[i].filename, data[i].local_path, data[i].size);

实际上必须是

let asset = new Asset(data[i].name, data[i].mimetype, data[i].filename, data[i].local_path, data[i].size, data[i].s3loc, data[i].thumb_local_path, data[i].proxy_local_path, data[i].thumb_s3_path, data[i].proxy_s3_path);

提供的参数与Angular2 MEAN app中的任何调用目标签名都不匹配

1 个答案: