def dict_to_json(xcol, ycols, labels, value_columns):  # pragma: no cover
    """
    Converts a list of dicts from datamodel query results
    to google chart json data.

    :param xcol:
        The name of a string column to be used has X axis on chart
    :param ycols:
        A list with the names of series cols, that can be used as numeric
    :param labels:
        A dict with the columns labels.
    :param value_columns:
        A list of dicts with the values to convert
    """
    json_data = dict()

    json_data["cols"] = [
        {"id": xcol, "label": as_unicode(labels[xcol]), "type": "string"}
    ]
    for ycol in ycols:
        json_data["cols"].append(
            {"id": ycol, "label": as_unicode(labels[ycol]), "type": "number"}
        )
    json_data["rows"] = []
    for value in value_columns:
        row = {"c": []}
        if isinstance(value[xcol], datetime.date):
            row["c"].append({"v": (str(value[xcol]))})
        else:
            row["c"].append({"v": (value[xcol])})
        for ycol in ycols:
            if value[ycol]:
                row["c"].append({"v": (value[ycol])})
            else:
                row["c"].append({"v": 0})
        json_data["rows"].append(row)
    return json_data

    Converts a list of dicts from datamodel query results
    to google chart json data.

    :param xcol:
        The name of a string column to be used has X axis on chart
    :param ycols:
        A list with the names of series cols, that can be used as numeric
    :param labels:
        A dict with the columns labels.
    :param value_columns:
        A list of dicts with the values to convert
    
flask_appbuilder/charts/jsontools.py