我需要知道这个问题的良好实践。
我正在使用switchMaps调用三个服务concat,但是对于最后一个服务,我需要第一个服务的变量。最佳做法是如何做到的?
示例:
this.session.account.get()
.switchMap(account => this.employerApi.get(account.accountId))
.switchMap(employer => this.addressApi.get(employer.addressId))
.filter(address => address.numer % 2)
.subscribe(address => console.log(¿¿¿¿¿account.name?????, address.name));
感谢您的帮助
答案 0 :(得分:2)
最简单的方法是随便汇总值:
this.session.account.get()
.switchMap(account =>
this.employerApi.get(account.accountId).map(employer => ({employer, account}))
.switchMap(data =>
this.addressApi.get(employer.addressId).map(address => ({...data, address}))
.filter(data => data.address.number % 2)
.subscribe(...)
答案 1 :(得分:1)
不确定这是最好的方法,但这是一种方法:
this.session.account.get()
.switchMap(account => zip(Observable.from(account), this.employerApi.get(account.accountId))
.switchMap((account, employer) => zip(Observable.from(account), this.addressApi.get(employer.addressId))
.filter((account,address) => address.numer % 2)
.subscribe((account,address) => console.log(¿¿¿¿¿account.name?????, address.name));
但是,就最佳实践而言,我认为您需要的是后端的序列化程序,该序列化程序以json格式返回结果,例如:{ "account": account_object, "address" : address_object}
。