我一直在尝试将firebase数据存储到一个数组中并整天打印出来,但无济于事.我真的很感谢社区的帮助.
下面是当前firebase数据库的外观图像：
- (void)readDataFromServer {
_ref = [[FIRDatabase database] reference];
_hotelRef = [_ref child:@"hotel bookings"];
NSString *userID = [FIRAuth auth].currentUser.uid;
FIRDatabaseQuery *userHotelBookingsQuery = [[_hotelRef child:userID] queryOrderedByChild:@"number"];
[userHotelBookingsQuery observeSingleEventOfType:FIRDataEventTypeValue withBlock:^(FIRDataSnapshot * _Nonnull snapshot) {
if (snapshot.value == [NSNull null]) {
NSLog(@"No messages");
} else {
[self.arrayOfBookingDetail removeAllObjects];
self.arrayOfBookingDetail = (snapshot.value);
NSString *firstMessage = [self.arrayOfBookingDetail objectAtIndex:0];
NSLog(@"First message is: %@",firstMessage);
}
}];
}
解决方法
您的代码失败是因为您正在通过实际不存在的用户uid获取子代. K2xxxxxxxx是每个元素的唯一字符串,与用户ID不对应.试试这个
_ref = [[FIRDatabase database] reference];
_hotelRef = [_ref child:@"hotel bookings"];
FIRDatabaseQuery *userHotelBookingsQuery = [_hotelRef queryOrderedByChild:@"number"];
[userHotelBookingsQuery observeSingleEventOfType:FIRDataEventTypeValue withBlock:^(FIRDataSnapshot * _Nonnull snapshot) {
if (snapshot.value == [NSNull null]) {
NSLog(@"No messages");
} else {
//[self.arrayOfBookingDetail removeAllObjects];
//self.arrayOfBookingDetail = (snapshot.children);
//NSString *firstMessage = [self.arrayOfBookingDetail objectAtIndex:0];
//NSLog(@"First message is: %@",firstMessage);
NSDictionary *allUsersData = (NSDictionary*)snapshot.value;
for (NSString *key in allUsersData.allKeys) {
NSLog("@key is %@,data is %@",key,allUsersData[key]);
}
}
}];
}
编辑：
FIRDatabaseQuery *userHotelBookingsQuery = [[_hotelRef queryOrderedByChild:@"userID"] queryEqualToValue:@"GEmxxxxxxxxx"];
