ng-model is not updating in Angularjs -

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acutally learning angularjs. i've introduced problem when click ng-click, ng-model not updating. code follows,

<div ng-repeat="product in cart">      <input type="number" ng-model="product.quantity" ng-required class="input-sm">      <button class="btn btn-xs" type="button" ng-click="product.quantity++">+</button>      <button class="btn btn-xs" type="button" ng-click="product.quantity--">-</button>  </div>

try this

<button type="button" ng-click="product.quantity = product.quantity+1">+</button> <button type="button" ng-click="product.quantity = product.quantity -1">-</button>

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