How to implement multiple filters with checkboxes in emberjs?

How do I implement multiple filters with checkboxes in emberjs? I would like to filter a grid table with the items that have certain properties that are checked in the template checkboxes...

For example, if I have this fixture:

export default employees[
{
  name: 'Ricky',
  department: 'Finance',
  departmentIsChecked: false
},
{
  name:'George',
  department:'Marketing'
  departmentIsChecked:false
},
{
  name:'Jonah',
  department: 'Finance',
  departmentIsChecked:false
}
];

how would I only display the checked department employees on the table?

This is what I have:

Ember.Controller.extend({
  filtered: function(){
    var departmentIsChecked = this.get('departmentIsChecked');

    var model = this.get('model');
    if (departmentIsChecked){
      model=model.filterBy('departmentIsChecked', true);
    }
    return model;
  }.property('departmentIsChecked')
});

Template:

{{#each employee in model}}
  {{input type='checkbox' checked=employee.departmentIsChecked}}{{employee.department}}
{{/each}}