角度工厂，then（）中的return语句promise返回未定义

Question

I call the following factory in my controller with MakeBusMarkers(orderedFilteredData) .

Console.log(mark) returns a valid object (called right before the return statement).
I presume a simple answer, but what am I doing wrong?

.factory('MakeBusMarkers', ['busesByDepot', '$timeout', 'CamelToString', function(busesByDepot, $timeout, CamelToString){

// make leaflet map markers from filtered data

return function(orderedFilteredData){
    var mark = {};

    busesByDepot.then(function(keyMap){     
        orderedFilteredData.forEach(function(currentVal){
            mark[currentVal.num] = {
                message : '#' + currentVal.num.toString()
            }

            ...some additional code here...

        console.log(mark);
        return mark;
    });
}

}])

Answer 1

Correct,

The factory then returns a promise object. Thank you.

.factory('MakeBusMarkers', ['busesByDepot', '$timeout', 'CamelToString', function(busesByDepot, $timeout, CamelToString){

// make leaflet map markers from filtered data

return function(orderedFilteredData){
var mark = {};

return busesByDepot.then(function(keyMap){     
    orderedFilteredData.forEach(function(currentVal){
        mark[currentVal.num] = {
            message : '#' + currentVal.num.toString()
        }

        ...some additional code here...

    console.log(mark);
    return mark;
});
}

}])