gistfile1.js

Teacher.virtual('highest_degree').get(function() {
  var weights = {
    'Doctorates' : 100,
    'Masters' : 10,
    'Bachelors' : 1
  }    
  
  return this.education.degrees.sort(function(a, b) {
    return weights[b.degree_type] - weights[a.degree_type];
  })[0].degree_type;
});