Uncaught TypeError: Cannot read property 'indexOf' of undefined

[joshpfosi]

Hi, I just did a fresh install of this plugin with

ember 1.12.0
ember-cli 0.2.4
materialize 0.96

and I am following the demo for some of the form components and running into some issues:

Using

    {{md-checks
        selection=checkboxSelections
        content=checkboxChoices
        optionValuePath='id'
        optionLabelPath='label'}}

w/

checkboxChoices: [
  {id: 1, label: "lala"},
  {id: 1, label: "apple"},
  {id: 1, label: "blue"}
]

yields

Uncaught TypeError: Cannot read property 'indexOf' of undefinedindexOf @ ember.debug.js:12019
isValueSelected @ selectable-item-group.js:29get @ selectable-item.js:15
ComputedPropertyPrototype.get @ ember.debug.js:11059get @ ember.debug.js:15588
.
.
.

at console. Any idea why?

[joshpfosi]

I'm sorry this was my bad. You must initialize the selection as well. Now I can't figure out how to "return" the selection array to the controller

[joshpfosi]

Can someone point me in the right direction for how this component it to be used? Now if I deselect the items in a particular order an exception is thrown...

[mike-north]

@joshpfosi on the off chance that you're still wrestling with this -- you can't have multiple items in the checkboxChoices array with the same id