FormControllerをControllerからごにょごにょする

HTML:

foo.html

<div ng-conroller="FooCtrl">
  <form name="form1">
    <div ng-init="putForm(form1)"></div>
    <label><input>・・・</input></label>
　　...
  </form>
  <form name="form2">
    <div ng-init="putForm(form2)"></div>
    <label><input>・・・</input></label>
　　...
  </form>
  <button ng-click="register()">Register</button>
</div>

Controller:

foo.js

function FooCtrl($scope){
  $scope.putForm = function(form){
     if (!$scope._forms) {
            $scope._forms = {};
     }
     $scope._forms[form.$name] = form;
  };

  $scope.register = function(){
    if($scope._forms.form1.$invalid || $scope._forms.form2.$invalid){
      window.alert("invalid!!");
      return;
    }
    ...
  };
}