Angularjs总是在自定义过滤器中从初始数据过滤

Question

我正在尝试使用一个自定义过滤器来过滤基于搜索词的数据。在以下contoller作用域中填充的作用域属性：

naApp.controller('naCareNewTicketCtrl', ['$scope', '$http', '$window', 'careservice', 'ptypesFilter',function($scope, $http, $window,  ptypesFilter) {
$scope.problemtypes = [{
    "name": "Fruit",
    "subtypes": [{
        "name": "Seeded",
        "subsubtypes": [{
            "name": "Apple"
        }, {
            "name": "Oranges"
        }]
    }, {
        "name": "Acidic",
        "subsubtypes": [{
            "name": "Lemon"
        }, {
            "name": "Orange"
        }]
    }]
}];

}]);

HTML：

<div ng-repeat="problem in problemtypes | ptypes:search">
   <ul>
       <li ng-if="problem.subtypes && problem.subtypes.length>0">{{problem.name}}</li>
       <li class="main-probs ellipsify no-child" ng-if="!(problem.subtypes && problem.subtypes.length>0)">{{problem.name}}</li>
          <ul ng-repeat="subproblem in problem.subtypes">
             <li ng-if="subproblem.subsubtypes && subproblem.subsubtypes.length>0">{{subproblem.name}}</li>
             <li class="sub-probs ellipsify no-child" ng-if="!(subproblem.subsubtypes && subproblem.subsubtypes.length>0)">{{subproblem.name}}</li>
             <li class="sub-sub-probs ellipsify no-child" ng-repeat="subsubproblem in subproblem.subsubtypes" ng-click="selectproblem(problem, subproblem, subsubproblem )">{{subsubproblem.name}}</li>
           </ul>
   </ul>
</div>

自定义过滤器代码：

naApp.filter('ptypesFilter', function() {
  return function(items, searchText) {
    if(searchText === undefined || searchText.length === 0){
      return items;
    } else {
      var filteredItems = [];
      for(var t = 0; t < items.length; t++){
        var type = items[t];
      // if item.name sub string matches then show entire item
      var pName = type.name;
      if(pName.indexOf(searchText) === 0){
        filteredItems.push(type);
      } else {
        // check for sub types
        if(type.subtypes !== undefined) {
          var subtypes = [];
          for(var st = 0; st < type.subtypes.length; st++){
            var stype = type.subtypes[st];
            var sPName = stype.name;
            if(sPName.indexOf(searchText) === 0) {
              subtypes.push(stype);
            } else {
              if(stype.subsubtypes !== undefined){
                var subsubtypes = [];
                for(var sst = 0; sst < stype.subsubtypes.length; sst++){
                  var sstype = stype.subsubtypes[sst];
                  var ssPName = sstype.name;
                  if(ssPName.indexOf(searchText) === 0){
                    subsubtypes.push(sstype);
                  }
                }
                if(subsubtypes.length > 0){
                  stype.subsubtypes = subsubtypes;
                }
              }
            }
          }
          if(subtypes.length > 0){
            type.subtypes = subtypes;
          }
        }
        if(type.subtypes !== undefined && type.subtypes.length > 0){
          filteredItems.push(type);
        }
      }
    };
    }
    return filteredItems;
  };
});

与过滤一样，当子类型/子类型的名称属性与在数组中键入的文本匹配时，我只放入匹配的子类型/子类型，并将其分配回父类型。(我需要显示匹配类型的层次结构)当我删除所有文本时，如何才能取回原始对象，以便有未过滤的初始设置进行填充。在过滤之前，我试着在对象上做$.extend，但这给了我错误。