How to get all draft message with specific label attached to it

Question

I have written a script, where I want to pull all draft message whose tag is shc.

Code:

function getDraftsWithLabel_shc() {
 Logger.clear();
 Logger.log("fn start..");
 var drafts = GmailApp.getDraftMessages(); //getUserLabelByName(ulables[x].getName()).

 var label = GmailApp.getUserLabelByName("shc");
     Logger.log(label);
     var threads = label.getThreads();
     Logger.log("LBL NAME ="+label.getName());
     Logger.log("THREAD ="+threads.length);

 for (var i = 0; i < threads.length; i++) {

       var message=threads[i].getMessages();
       Logger.log(" thread ID = "+threads[i].getId());

       if(message.length<0)
       {
           for(m=0;m<message.length;m++){
              var isD=message[m].isDraft();
              Logger.log("is Draft ="+isD);
              if(isD)
              {
                    Logger.log(message[m].getSubject()+" = "+message[m].getTo()+" = "+message[m].getDate());
              }
           }
       } 
       else 
       {
           Logger.log("No mesage");
       }
 } 
   Logger.log("fn Ends..");

}

Here in code i am trying to get the labelname and then respective threads. Then loop over thread and by using getMessages() check for if current isDraft then based on conditon get all other details.

First I am not able to get messages. Second is there any efficient way to get direct all Draft threads with specific labels coz looping over all thread is taking so much time

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Screenshot of Log:

Answer 1

drafts.list() now accepts raw query param q so you can simply specify it to do what you want. Something like:

q=in:<label>

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See Gmail API's Users.drafts: list docs for more details.