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    const schema = new Schema({ firstName: String, lastName: String });

    class PersonClass {
      // `fullName` becomes a virtual
      get fullName() {
        return `${this.firstName} ${this.lastName}`;
      }

      set fullName(v) {
        const firstSpace = v.indexOf(' ');
        this.firstName = v.split(' ')[0];
        this.lastName = firstSpace === -1 ? '' : v.substr(firstSpace + 1);
      }

      // `getFullName()` becomes a document method
      getFullName() {
        return `${this.firstName} ${this.lastName}`;
      }

      // `findByFullName()` becomes a static
      static findByFullName(name) {
        const firstSpace = name.indexOf(' ');
        const firstName = name.split(' ')[0];
        const lastName = firstSpace === -1 ? '' : name.substr(firstSpace + 1);
        return this.findOne({ firstName, lastName });
      }
    }

    schema.loadClass(PersonClass);
    var Person = db.model('Person', schema);

    Person.create({ firstName: 'Jon', lastName: 'Snow' }).
      then(doc => {
        assert.equal(doc.fullName, 'Jon Snow');
        doc.fullName = 'Jon Stark';
        assert.equal(doc.firstName, 'Jon');
        assert.equal(doc.lastName, 'Stark');
        return Person.findByFullName('Jon Snow');
      }).
      then(doc => {
        assert.equal(doc.fullName, 'Jon Snow');
      });