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[英]in firebase firestore how can I update a document without overwriting subcollections?
[英]I can't access one of two subcollections in firestore data base. React
我可以使用此代码访问第一个:
useEffect(() => {
const getData = () => { // get data from firestore to app
const q = query(collection(db, `lists/my lists/${currentList}`), orderBy('queryPreference'));
onSnapshot(q, (snapshot) => {
firestoreList = []; // reset firestoreList after every change to avoid copies in items array
firestoreIds = [];
snapshot.docs.forEach((doc) => {
console.log('subcol item', doc)
firestoreList.push({ ...doc.data(), id: doc.id });
firestoreIds.every(id => id !== doc.id) && firestoreIds.push(doc.id);
});
if (firestoreList.length === 0) {
setItems(items.concat(newItem));
} else {
setItemIds(firestoreIds);
setItems(firestoreList);
}
});
}
getData();
console.log('get data test')
}, [currentList]);
其中currentList
被硬编码为“购物清单”。 如果我将currentList
更改为“待办事项列表”,firebase 不会返回任何内容(也没有错误)。 collections 的名称和 ID 拼写如上:'shopping list' 和 'to do list'。
它应该是这样的:
const q = query(collection(db, 'lists', 'my lists', currentList),
orderBy('queryPreference'));
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