title: angular-fullstack: call api without _id, like findByField
body: <p>I have collection mongodb like this:</p>
  
  <pre><code> var CategorySchema = new mongoose.Schema({
  Name: String,
  Description: String,
  Picture: {
     type: String,
     default: 'http://placehold.it/64x64'},
  Level: {
     type: Number,
     default: 1},
  Owner:{
    type: Schema.ObjectId,
    ref: 'Category'}
   });
  </code></pre>
  
  <p>How can get result using Owner, because api of this just can get result by _id.</p>