javascript database callback and promise

// list of 'employee' objects
var objs = getList();
Promise.all(objs.map(function(o) {
    // use 'node-orm2'.find() or 'node-mysql'.query()
    // if no similar exists, return it (some where condition)

    // problem is find() and query() have their own 'callback'
    // where do I return 'o' for the 'Array.map()'?

}).then(function(filteredObjs) {
    // do whatever I want
});