Hello, How can I get a document ID by having field data of the same document (Firebase Firestore)? collection/document_id/field I have the field data and want to get the document_id. Btw, I use Java in Android Studio. javadatabasefirebasefirestore ...
Firebase 是Google推出的一个云服务平台，同时也是一个应用开发平台，可帮助你构建和拓展用户喜爱的应用和...
Retool allows you to query available Firestore collections (top level or under a specific document ID), which you can use to dynamically select which documents to display in the table. To get started, create a query that lists top level collections. Query that lists all collections To query a...
每个文档引用都带有一个ID。您可以获取此ID并将其设置为post ID。
但是你在它们上面使用了!，这意味着你确信它们不是空的，但是它们是空的。同样，你的id可能是空的，...
当你调用.orderBy('id')时，这意味着你试图根据一个名为id的字段对从Firestore获取的文档进行排序。
get("age") as? Int { print("User age: \(age)") } } } 客户端扇出 在Firestore 中,客户端扇出同样可以通过事务来实现。 代码语言:javascript 复制 func updateUserProfile(userId: String, profileData: [String: Any]) { let profileRef = db.collection("profiles").document(userId) let activity...
你试图读取/clarity/{documentId}，但是playground没有对{documentId}进行任何扩展，所以它最终试图读取/...
importFirebaseimportFirebaseFirestoreclassFirestoreController{letdb=Firestore.firestore();// 添加新文档并设置数据funcaddDocument(){// 为集合指定一个名字,然后添加一个文档,使用自动生成的文档名称varref:DocumentReference?ref=db.collection("users").addDocument(data:["name":"John Smith","email":"john@gmai...
The next get function gets data in favor of the cache. If there is no cached data, it gets from the server. let document: Document<Model> = Document("DOCUMENT_ID") document.get { (document, error) in print(document.data) } Why data is optional? In CloudFirestore, DocumentReference doe...