如何使用 Angularfire2 访问 firestore 中的参考数据字段?

How to access reference data field in firestore using Angularfire2?

This is my Tasks Collection where assignee field refers to users collection

This is the output i am getting when i fetch tasks collection

//SAVING...
let ref = db.collection('nameOfCollection').doc('documentId').ref
     //Focus ".ref" at the end
db.collection('otherCollection').doc('otherDocumentId').set({ nameRef:ref })


//READING...
db.collection('otherCollection').doc('otherDocumentId').ref.get().then(res=>{
   //this "res.data().nameRef" 
   //it is the same as  
   //"db.collection('nameOfCollection').doc('documentId').ref"
})

我不知道我是否可以提供帮助,但不幸的是我做了我能做的。 我还是不会说英语,抱歉。