javascript - 同期 DB リクエスト Node JS ORM

Question

DBからの値を配列に入力してから返す必要があるため、これを同期させるにはどうすればよいですか

   var convs = Array;
    User.find({token: token}).first(function(err, user) {
          ConversationData.find({user_id: 1}).each().forEach(function(convData) {
            ConversationData.count({conversation_id: convData.conversation_id}, function(err, count) {
              if(count == 2) {
                var user2;
                console.log(convData.user_id);
                ConversationData.find({user_id: 2, conversation_id: convData.conversation_id}).first(function(err, usr) {
                  user2 = usr;
                });
                Message.find({conversation: convData.conversation_id}, [ "createdAt", "Z" ]).first(function(err, msg){
                  convs[convData.id].conversation = convData.id;
                  convs[convData.id].lastMessage = msg.content;
                  convs[convData.id].lastMessageDate = msg.createdAt;
                  convs[convData.id].title = user2.name + " " + user2.name;
                  convs[convData.id].avatar = user2.avatar;
                });
              } else {
                console.log('COUNT = ' + count);
              }
            });
          });
console.log(convs);