Already select items with an existing array

[code-by-marc]

I am trying to select a few items from the suggestions-arr with items that are already in the ng-model. Couldn't find a use-case so I created this issue.

Getting the following error:
Error: [ngRepeat:dupes] Duplicates in a repeater are not allowed. Use 'track by' expression to specify unique keys. Repeater: item in modelArr, Duplicate key: string:", Duplicate value: "

When I use track by I'll get the next error:
Error: [$parse:syntax] Syntax Error: Token 'track' is an unexpected token at column 13 of the expression [$ctrl.types track by name] starting at [track by name].

My select code:

<multiple-autocomplete
    ng-model="$ctrl.acceptedTypes"
    object-property="name"
    suggestions-arr="$ctrl.types"
    id="acceptedTypes">
</multiple-autocomplete>

$ctrl is used because I work with component instead of directives

Anybody an idea how to solve this?