[英]Angular 7 - How to chain HTTP request with observables
I want to be able to remove an alert, but only if this alert is not assigned to an user. 我希望能够删除警报,但仅限于此警报未分配给用户。 For that I need to get my users list and check if no user has this alert assigned. 为此,我需要获取用户列表并检查是否没有用户分配此警报。 I managed to make it work by chaining 2 requests with observables, but is there a better way to achieve that? 我设法通过用可观察量链接2个请求来使其工作,但是有更好的方法来实现吗?
deleteAlert(id: number) {
this.usersService.getUsers().subscribe(
(users) => {
if (users.filter((value) => value.alert.id === id).length > 0) {
console.log('Deassing alert to all user first');
} else {
this.alertService.deleteVillain(id)
.subscribe(() => {
this.alertsList =this.alertsList.filter(alerts=>alerts.id!==id);
});
}
}
)}
You can use flatMap
operator as mentioned in this answer . 您可以使用此答案中提到的flatMap
运算符。
deleteAlert(id: number) {
this.usersService.getUsers().flatMap(
(users) => {
if (users.filter((value) => value.alert.id === id).length > 0) {
console.log('Deassing alert to all user first');
} else {
return this.alertService.deleteVillain(id);
}
}).subscribe(data=>{
this.alertsList = this.villainsList.filter(alerts=>alerts.id!==id);
});
}
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