having a hard time structuring

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
}
]
};
}
```

The issue includes only a settings function and an example post structure; it names no file, test, or concrete repository change. Start by tracing the shown collection and field configuration, then determine whether the requested username dropdown behavior is supported; done is a documented, reproducible change request with a clear expected result.

Written by the indexing model from the issue text.