having a hard time structuring

[sangyoo91]

I am trying to retrieve the users that are participating in a discussion. Here is the structure of my post

post =  {
  commentors: {
        {
            _id : "someid",
            username : "someusername"
        },
        {
            _id : "someid",
            username : "someusername"
        },
  }
}

I would like to retrive the username in the dropdown. How would I do this?

Right now I have this.

  settings: function () {
    return {
      position: "bottom",
      limit: 5,
      rules: [
        {
          token: '@',
          collection: Posts,
          field: "commentors",
          template: Template.usernameTag
        }
      ]
    };
  }