Ng-repeat array of nodejs objects

I am using angularJS with a node back-end that sends data using socketio. Then I try to show the data using ng-repeat. If I initialize the data inside the controller, then ng-repeat works fine, but if I add data when it is received from the server, nothing will be displayed on the screen when ng-repeat is displayed.

Here is the code snippet I'm using: (Trans.html)

<div id='trans' ng-app='MyApp'>
    <h1>Transactions</h1>
    <div class="pure-g-r" ng-controller='TransController'>
        <div class="pure-u-1-2" ng-repeat="trans in transactions">
            <h1>{{ trans.name }}</h1>
            <p>{{ trans.description}}</p>
            <p>{{ trans.date }}</p>
            <p>{{ trans.category }}</p>
        </div>
    </div>

</div>

<script src="/js/loadAngular.js"></script>

(controller.js)

  function TransController($scope, socket) {
    $scope.transactions = [];
    $scope.currentMonth = "March";
    $scope.categories = [];

    init();

    function init() {
        console.log("emitting init functs");
        socket.emit('data', {request: 'transactions', month: $scope.currentMonth});
        socket.emit('getCategories', {});
    };

    socket.on('dataResponse', function (data) {
        console.log(data);  
        if(data.response === 'transactions'){
            $scope.transactions = [];
            var tran = data.data;
            for(var i = 0; i < tran.length; i++){
                $scope.transactions.push(tran[i]);
                console.log(tran[i]);
            };
        }
        console.log($scope.transactions);
        console.log("CURRENT MONTH " + $scope.currentMonth);
    });

(server.js)

   var myTransactions = {
        January : [{
            name: "Tesco shopping",
            date: "January",
            description: "This is my description, I went to the shop and bought loads of food.",
            category: "Food"
    }],
        February : [],
        March : [{
            name: "Booze shopping",
            date: "March",
            description: "This is my description, I went to the shop and bought loads of food.",
            category: "Food"
    },{
            name: "Tesco shopping",
            date: "March",
            description: "This is my description, I went to the shop and bought loads of food.",
            category: "Food"
    }],
    ...
    };

    mudev.addCustomEvent('data', function(socket,data){
        var request = data.request;
        var month = data.month;
        console.log("Data Request: request:",request, " month:",month);
        if(month==null){
            socket.emit('dataResponse', {
                response: 'transactions',
                data: myTransactions
            });
        }else{
            socket.emit('dataResponse', {
                response: 'transactions',
                data: myTransactions[month]
            })
        }

    });

The only difference that I see between the data is that when I statically initialize the data inside the controller, there is an additional key called "HashKey", which is absent when the data is sent from the server. I read the angular documentation again, but can't find anything about this problem.

. ( , ng-repeat )