firebase - 使用Dart迭代DataSnapshot

Question

void _newMessage(fb.QueryEvent event) {

    fb.DataSnapshot d = event.snapshot;

    // here want to process each of child of d

}

我想我应该使用d.forEach()。是否有使用Dart遍历DataSnapshot的子代的示例？

Answer 1

void addMessage( fb.DataSnapshot d){

    PCDChatMessage msg = new PCDChatMessage.fromMap(d.val());

    pcdChatMessages.add(msg); //todo don't duplicate messages

}

void _newMessage(fb.QueryEvent event) {

    fb.DataSnapshot d = event.snapshot;

    // process each child of d
    d.forEach((k) => addMessage(k));

}

这对我有用-我必须正确设置Dart动态语法。