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[英]How to query data with isEqualTo and isNotEqualTo in firebase firestore
[英]firebase firestore return wrong data for collection query
我正在使用 Firestore db 通過 collections 數組的名稱獲取集合,當我打印結果不是從集合是 db.collection(collectionName).get() 方法時,Firestore 似乎從另一個集合返回錯誤結果。 從 collections 的返回值中,我也沒有在循環中看到錯誤。任何線索可能是問題所在。
private String[] collections = {"appetizers", "breakfast", "indian", "lunch", "noodles", "salad", "trending"};
private int n = 0;
FirebaseFirestore db = FirebaseFirestore.getInstance();
for (int i = 0; i < collections.length; i++) {
db.collection(collections[i])
.get()
.addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
@Override
public void onComplete(@NonNull Task<QuerySnapshot> task) {
if (task.isSuccessful()) {
resultList = new ArrayList<>();
for (QueryDocumentSnapshot document : task.getResult()) {
Map<String, Object> data = document.getData();
System.out.println(collections[DashBoardActivity.this.n] + " collection " + (String) data.get("data_name"));
}
DashBoardActivity.this.recipesMap.put(collections[DashBoardActivity.this.n], resultList);
DashBoardActivity.this.n++;
} else {
System.out.println("Task not successful fire");
}
}
});
如果所有數據都被接收,我認為這只是因為每次運行.get()
之間的順序不同,請考慮使用ref.orderBy(/* field */);
獲得恆定的訂單。
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