Firestore从集合中获取文档ID [英] Firestore Getting documents id from collection

问题描述

我正在尝试检索具有ID的文档，但无法弄清楚.
目前，我以这种方式检索我的文档:

I'm trying to retrieve my documents with id but can't figure it out.
Currently I retrieve my documents like this :

const racesCollection: AngularFirestoreCollection<Races> = this.afs.collection('races');
return racesCollection.valueChanges();

我的文档列表确实很完整，但是它们没有文档ID.

I do get my documents list perfectly, however there is no doc id with them.

如何为每个文档检索它?

How can I retrieve it for each document ?

推荐答案

我终于找到了解决方案.维克多(Victor)与文档数据保持密切联系.

I've finally found the solution. Victor was close with the doc data.

const racesCollection: AngularFirestoreCollection<Race>;
return racesCollection.snapshotChanges().map(actions => {       
  return actions.map(a => {
    const data = a.payload.doc.data() as Race;
    data.id = a.payload.doc.id;
    return data;
  });
});

ValueChanges()不包含元数据，因此我们在需要文档ID时必须使用SnapshotChanges()，然后按照此处所述正确映射它

ValueChanges() doesn't include metadata, therefor we must use SnapshotChanges() when we require the document id and then map it properly as stated here https://github.com/angular/angularfire2/blob/master/docs/firestore/collections.md

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