I set an observer for some directory, represented as <head> in this case like so (simplified code sample):
<body>The problem is, even though the data in that location (Document doc = Jsoup.parseBodyFragment(html);
doc.outputSettings().prettyPrint(false);
System.out.println(doc.select("body").html());
) does never change, handler gets called multiple times (usually 2 times) and, what's bugging me most, with different data for just one field (the ref one). Any thought on why this could be happening?
P.S. I usually remove all observers for a reference inside its callback handler, but, in this case, I can't do that, since the first call returns data with wrong ref.observe(.value, with: { snap in
if snap.exists(){
let some = MyStructure(snap: snap)
print(some.date)
}
})
field, yet the next one tends to be the right one.
P.S.S. I cannot use '.observeSingleEvent' method, since it uses cached data (stored by Firebase, I believe), and here it is essential to retrieve only relevant data.
答案 0 :(得分：1)
经过一番挖掘后，我发现双击是Firebase SDK的预期行为。第一个 - 参考的缓存快照，第二个 - 从实时数据库中检索。
将isPersistenceEnabled设为false。这将确保所有.observe调用不使用设备本地缓存的数据
使用第二个电话更新数据（如果有的话）