javascript - Error: ngModel: Non-Assignable Expression -


i have code generates drop down list dynamically. want set selected value using ng-repeat, using function in ng-model getting 

error: [ngmodel:nonassign] expression 'item.blockname = getcurrentcomboboxvalue(item.blockname.id, blocknameoptions)' non-assignable. element: <select class="form-control input-sm" ng-model="item.blockname = getcurrentcomboboxvalue(item.blockname.id, blocknameoptions)" name="blockname" ng-options="choice.id choice.value choice in blocknameoptions">

html

<div ng-repeat="item in modulesdata.blocks track item.id">     <select class="form-control input-sm" ng-model="item.blockname = getcurrentcomboboxvalue(item.blockname.id, blocknameoptions)" name="blockname"          ng-options="choice.id choice.value choice in blocknameoptions">      </select> </div>

controller

$scope.getcurrentcomboboxvalue = function (id, availabledata) {     var result = _.where(availabledata, { 'id': id });     return result[0]; }

getcurrentcomboboxvalue(blocknameoptions) not valid on left-hand side of =. ngmodel requires thing on left-hand side assignable.


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