你好我在angularfire2新。我试图根据$ key值将对象连接到一个数组（列表）。
我当前的代码如下：
console.log("Create Relationship Person 2 Person Observable");
const relationshipP2Ps$: FirebaseListObservable<any> = af.database.list('/relationshipP2P') // Primary list
.map(items => {
// `items` is an array of all items at the moment
for (let item of items) {
// Find each corresponding associated object and store it as a FibrebaseObjectObservable
const i: FirebaseObjectObservable<any> = af.database.object('/person/' + item.person1, { preserveSnapshot: true })
i.subscribe(snapshot1 => {
console.log(snapshot1.key)
item.person1FirstnameEng = snapshot1.val().firstnameEng;
item.person1LastnameEng = snapshot1.val().lastnameEng;
item.person1FirstnameZhs = snapshot1.val().firstnameZhs;
item.person1LastnameZhs = snapshot1.val().lastnameZhs;
});
const j:FirebaseObjectObservable<any> = af.database.object('/person/' + item.person2, { preserveSnapshot: true })
j.subscribe(snapshot2 => {
console.log(snapshot2.key)
item.person2FirstnameEng = snapshot2.val().firstnameEng;
item.person2LastnameEng = snapshot2.val().lastnameEng;
item.person2FirstnameZhs = snapshot2.val().firstnameZhs;
item.person2LastnameZhs = snapshot2.val().lastnameZhs;
});
const k :FirebaseObjectObservable<any> = af.database.object('/relationshipCategory/' + item.category, { preserveSnapshot: true })
k.subscribe(snapshot3 => {
console.log(snapshot3.key)
item.categoryNameEng = snapshot3.val().nameEng;
item.categoryNameZhs = snapshot3.val().nameZhs;
});
const l :FirebaseObjectObservable<any> = af.database.object('/relationship/' + item.relationship, { preserveSnapshot: true })
l.subscribe(snapshot4 => {
console.log(snapshot4.key)
item.relationshipNameEng = snapshot4.val().nameEng;
item.relationshipNameZhs = snapshot4.val().nameZhs;
});
}
return items;
});
relationshipP2Ps$.subscribe(relationshipP2Ps => this.relationshipP2Ps=relationshipP2Ps);
现在这一切都很好但是当它运行时我得到以下错误：
/src/app/relationship-p2p/relationship-p2p.service.ts:2:15
Type 'Observable<any[]>' is not assignable to type 'FirebaseListObservable<any>'. Property '$ref' is missing in type 'Observable<any[]>'.
有关如何重写此内容的任何想法导致无错误？