javascript - Angular filter "Error: [ngModel:nonassign] Expression '(gridData.StructureViewModel | sumPlanByKpi:kpi)' is non-assignable." -


pls, me resolve error. , wrong?

i have input custom filter | sumplanbykpi:kpi

filtermodule.filter('sumplanbykpi', ['$filter', function ($filter) {      return function (input, kpi) {          if (angular.isundefined(input) && angular.isundefined(kpi))              return 0;          var sum = 0;            var findedplansarray = [];          (i = 0; < input.length; i++) {              var findedplans = $filter('filter')(input[i].plans, function (plan) { return plan.kpi_id === kpi.id; });              var temp = findedplansarray.concat(findedplans);              findedplansarray = temp;          }          angular.foreach(findedplansarray, function (v, k) {              if (v.value != null)                  sum = sum + parseint(v.value);          });          return sum;      };  }]);
<input type="text" class="form-control input-sm col-lg-1" ng-model="(griddata.structureviewmodel | sumplanbykpi:kpi)"               disabled="" pattern="^[0-9]*$" min="0" max="1e+22" step="1"               awnum num-sep=',' num-neg=false num-int=40 num-fract=0 num-thousand=true num-thousand-sep="{{' '}}">

image - , errors on client

i find answer question. should use ng-value input in case instead of ng-model.

<input type="text" class="form-control input-sm col-lg-1" ng-value="(griddata.structureviewmodel | sumplanbykpi:kpi)"          disabled="" pattern="^[0-9]*$" min="0" max="1e+22" step="1"          awnum num-sep=',' num-neg=false num-int=40 num-fract=0 num-thousand=true num-thousand-sep="{{' '}}">

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