Question

我有以下课程：

import { Hobbies } from './hobbies';

export class Results {

constructor(
    $key: string,
    first_name: string,
    gender: string,
    intent: string,
    seeking: string,
    training: string,
    latitude: string,
    longitude: string,
    location_desc: string,
    state: string,
    hobbies: Hobbies[],
    cloud_Id: string) {

}

static fromJsonList(array): Results[] {
    return array.map(json => Results.fromJson(json))
}

static fromJson({ $key, cloud_Id, first_name, gender, hobbies, intent, latitude, location_desc, longitude, seeking, state, training }): Results {

    debugger;
    return new Results(
        $key,
        first_name,
        gender,
        intent,
        seeking,
        training,
        latitude,
        longitude,
        location_desc,
        state,
        hobbies,
        cloud_Id);
}


}

我打电话给Firebase并检索一个用户列表，这些用户的状态与我传入的位置匹配，如下所示：

getSearchResults(location: string): Observable<Results[]> {

        return this.af.database.list('/user/', {
            query: {
                orderByChild: 'state',
                equalTo: location
            }
        }).map(Results.fromJsonList);
}

然后我.map对(Results.fromJsonList);

的回复

在static方法fromJson内，当我点击debugger断点并检查传递的值时，它们都是正确的。

但是，当我在组件中记录结果时：

getSearchResultsComponent(gender: string, seeking: string, intent: string, location: string, hobbies?: string) {

  this.searchSubscription = this.searchService.getSearchResults(location).subscribe(results => {
   console.log(results);
  });

}

我看到以下内容：

我应该看到两个用户的条目，即first_name，性别，位置等。

有人可以解释为什么这种映射不像我设想的那样工作吗？

Answer 1

创建所有Results类成员public，以便可以通过对象实例访问它们。目前您只是将参数传递给Results constructor，但它们并未分配给任何类成员。

export class Results {

    constructor(
        public $key: string,
        public first_name: string,
        public gender: string,
        public intent: string,
        public seeking: string,
        public training: string,
        public latitude: string,
        public longitude: string,
        public location_desc: string,
        public state: string,
        public hobbies: Hobbies[],
        public cloud_Id: string
    )
    //other code
}

将firebase响应映射到类

1 个答案: