{ CollectionReference collection = FirebaseFirestore.instance.collection('your_collection'); // 替换为你的集合名称 DocumentReference document = collection.doc('your_document'); // 替换为你的文档名称 DocumentSnapshot snapshot = await document.get(); if (snapshot.exists) { print('Document exists!
String fileName = 'your_file_name'; bool fileExists = false; void checkFileExists() async { DocumentSnapshot documentSnapshot = await firestore.collection('files').doc(fileName).get(); if (documentSnapshot.exists) { fileExists = true; print('File exists in Firestore.'); } el...
const document = await getDocumentSnapshotToSave(newRefPath, doc.data().exercise); document.forEach(async (doc) => { //check if value exists const getDocument = await admin.firestore().doc(`${doc.ref.path}`).collection('AnalyseData').doc(`${year}`).get(); if (getDocument && get...
The function can be null, so make sure to check that it exists before calling it. Note: This is not necessary to use. useDocument already unmounts the listener for you. This is only intended if you want to unsubscribe on your own.The...
data the data of a document to save (update if it exists, set if it does not) fields optionally you can pass a field name or array of fields to update (as opposed to all) $fiery.sync ( data, fields? ): Promise<void> data the data of a document to update. any fields no...
如果您遇到此问题，请确保您没有创建currentUser的示例。应用中任何位置的文档路径的.UID，除非用户已登录...
doc(uid).get(); return doc.exists; } @override void initState() { super.initState(); _checkIfAdmin(); } Future<void> _checkIfAdmin() async { String uid = FirebaseAuth.instance.currentUser!.uid; bool admin = await _isAdmin(uid); setState(() { isAdmin = admin; }); } @override...
一些用户获得了身份验证，但没有将数据存储在我的Flutter应用程序的FireStore中而不是检查用户存在与否与...
一些用户获得了身份验证，但没有将数据存储在我的Flutter应用程序的FireStore中而不是检查用户存在与否与...
一种替代方案是在Firestore中保持键/值对作为子集合，以通过经由安全规则检查regNo是否存在来跟踪链接了...