如何查询Firebase Firestore引用数据类型？

Question

我正在使用Firestore引用数据类型存储对用户的引用，如下图所示

用户引用

用户集合

//.. this function reads data from DocumentSnapshot
//.. and converts to an Organization
private fun DocumentSnapshot.toOrganization(): Organization {
  //.. some code
      (this.data["members"] as ArrayList<HashMap<String, Any>>).map { toOrgMember(it) })
  //.. more code
}

fun toOrgMember(map: Map<String, Any>): OrgMember {
  //map["user"] as String throws ClassCastException. Refer first screenshot
  return OrgMember(map["id"] as Long, UserRef(map["user"] as String), map["type"] as String,
      asJobTitlesList(map["jobTitles"] as String))
}

10-14 20:31:17.503 15569-15569/com.a.b W/System.err: Caused by: java.lang.ClassCastException: com.google.android.gms.internal.zzegf cannot be cast to java.lang.String
10-14 20:31:17.504 15569-15569/com.a.b W/System.err:     at feature.model.core.CoreUtilsKt.toOrgMember(CoreUtils.kt:28)
10-14 20:31:17.504 15569-15569/com.a.b W/System.err:     at feature.model.organization.OrgRemoteKt.toOrganization(OrgRemote.kt:55)

Answer 1

当从集合中获取引用时，Firestore返回DocumentReference。如果将强制转换更改为DocumentReference不起作用，请跟踪此问题。