How to correct an "Undefined aggregationValue"

Question

I am trying to get the sum of a column of integers in my grid. How come the aggregationValue is undefined when in the gridOptions I have it set as

{ field: 'premium', name: 'Premium', width: '*', aggregationType: uiGridConstants.aggregationTypes.sum, aggregationHideLabel: true, cellTemplate: '<div class="ui-grid-cell-contents">${{COL_FIELD}}</div>' },

Here is a snapshot of the object. As you can see aggregationType is 2 (sum).

Here is a snap[shot of uiGridConstants that shows that it knows the type is sum

Here is an example of the object that makes up the grid

[
    {
        "id": "",
        "name": "Hadassah Potts",
        "type": "Wealth",
        "status": "Completed",
        "premium": 38823,
        "commission": 2039,
        "created_by": "Rose Strong",
        "last_updated": 75
    },
    {
        "id": "",
        "name": "Michael D. Hodge",
        "type": "Wealth",
        "status": "In Review",
        "premium": 37173,
        "commission": 4644,
        "created_by": "Thaddeus S. Wyatt",
        "last_updated": 49
    }
]

Answer 1

Even though im not using showColumnFooter: true, i needed to have it in the code...