promise with loop and file read in nodejs

Question

I looked at lot of example but couldn\'t achieve it..so need help..

Problem..

1. the content from loop should be passed to execute one by one

Answer 1

I have updated the code with Q.all as the mentioned p.then will execute only once.

http://runnable.com/VI1efZDJvlQ75mlW/api-promise-loop-for-node-js-and-hello-world

 form.parse(req, function(err, fields, files) {
    var p = Q();
    Object.keys(files).forEach(function (key) {
        promises.push(p.then(function () { // chain the next one
            return Q.nfcall(fs.readFile, files[key].path, "binary"). // readfile
                then(function (content) { // process content and save
                   file = {};
                    file.filename = files[key].name;
                    file.path = files[key].path;
                    file.content_type = files[key].type;
                    file.size = files[key].size;
                    console.log(files[key].name);
                    file.content = binaryToBase64(content);
                    filesarr.push(file);
                   // Q.npost(art.save, art); // wait for save, update as needed
                })
        }));

        Q.all(promises);
    });
});

the question is how to use q.npost if i have mongoose model files and want to save...?