Can not hide the button of table row using Angular.js

The existing code needs some modification as the key for edit and delete is same, so it clears the whole. Please refer the code below:

HTML

<tbody id="detailsstockid">
    <tr ng-repeat="code in ListOfGeneratedCode">
        <td>{{$index+1}}</td>
        <td>{{code.name}}</td>
        <td>{{code.no_of_voucher}}</td>
        <td>{{code.expired_date}}</td>
        <td>{{code.voucher_amount}}</td>
        <td><input type='button' class='btn btn-xs btn-green' value='View' ng-click="viewVoucherCodeData(code.voucher_code_id);"></td>
        <td><img ng-src="upload/{{code.image}}" name="pro" border="0" style="width:50px; height:50px; border:#808080 1px solid;" /></td>
        <td>
            <input type='button' class='btn btn-xs btn-green' value='Send' ng-click="sendVoucherCode(code.voucher_code_id);">
        </td>
        <td ng-hide="code.editButton">
            <a ui-sref="code">
                <input type='button' class='btn btn-xs btn-green' value='Edit' ng-click="editVoucherCodeData(code.voucher_code_id);">
            </a>
        </td>
        <td ng-hide="code.delButton">
            <a ui-sref="code">
                <input type='button' class='btn btn-xs btn-red' value='Remove' ng-click="deleteVoucherCodeData(code.voucher_code_id);">
            </a>
        </td>
    </tr>
</tbody>

JS

Add this after $scope.ListOfGeneratedCode has been instantiated.

angular.forEach($scope.ListOfGeneratedCode, function (value, key) {
    value.push('editButton', false);
    value.push('delButton', false);
});

Append/change the existing methods with:

$scope.sendVoucherCode = function (id) {
    angular.forEach($scope.ListOfGeneratedCode, function (value, key) {
        if (value.voucher_code_id == id) {
            value.editButton = $scope.delButton = true;
        }
    });
}

$scope.editVoucherCodeData = function (id) {
    angular.forEach($scope.ListOfGeneratedCode, function (value, key) {
        if (value.voucher_code_id == id) {
            value.editButton = true;
        }
    });
}

$scope.deleteVoucherCodeData = function (id) {
    angular.forEach($scope.ListOfGeneratedCode, function (value, key) {
        if (value.voucher_code_id == id) {
            value.delButton = true;
        }
    });
}