booleanComparators: computed(function() {
    return this.createComparators([
      { propertyType: 'boolean', label: '<>', internalName: 'notEqual', valueForQuery:'{0} != {1}' },
      { propertyType: 'boolean', label: '=', internalName: 'equal', valueForQuery:'{0} == {1}' }
    ]);