Json 角度2(类型脚本)-RxJS可观察-groupBy
json数据Json 角度2(类型脚本)-RxJS可观察-groupBy,json,angular,rxjs,Json,Angular,Rxjs,json数据 { "name": "Sam", "age":25, "schools": [ { "country":"USA", "state":"IN", "city":"Fishers", "name":"school 1" }, { "country":"USA", "state":"IN", "city":"Indianapolis",
{
"name": "Sam",
"age":25,
"schools":
[
{
"country":"USA",
"state":"IN",
"city":"Fishers",
"name":"school 1"
},
{
"country":"USA",
"state":"IN",
"city":"Indianapolis",
"name":"school 2"
},
{
"country":"USA",
"state":"CO",
"city":"Denver",
"name":"school 3"
},
{
"country":"Canada",
"state":"Ontario",
"city":"Toronto",
"name":"school 4"
}
]
}
我需要在学校数组上按“国家”分组,然后按“州”分组,然后按“城市”分组
我的打字脚本界面
interface Person{
name:string;
age:number;
schools: School[];
}
interface School{
country:string;
states: State[];
}
interface State{
state:string;
pairs: Pair[];
}
interface Pair{
city:string;
name:string;
}
我需要编写一个服务方法来将json数据转换到我的模型中,以便学校按国家分组,国家按州分组,州按城市和名称分组
我的模型结构正确吗?如果是,我如何根据需要分组
我的服务方式应该是这样的
getPerson():Observable<Person>
{
return this.http.get(url to get json data).groupBy(XYZ..).....
}
getPerson():可观察
{
返回此.http.get(获取json数据的url).groupBy(XYZ…..)。。。。。
}
这不是帮助,而是请求。。。不管怎样,这里是:
groupBy(array: any[], property: string) {
return array.reduce((prev, next) => {
// If the group doesn't exist, create it
if(!prev[property]) { prev[property] = [next]; }
// Else, we push it in
else { prev[property].push(next); }
// Mandatory return
return prev;
}, {});
}
现在您有了一个分组对象。您可以使用它,也可以将其转换为数组 可能重复的