var content = function(data){
    var self = this;
    self.id = ko.observable();
    self.type = ko.observable();
    self.category = ko.observable();
    self.title = ko.observable();
    self.content = ko.observable();

    if (data) {
        self.update(data);
    }
}
content.prototype.update = function(data) {
    this.id(data.id);
    this.type(data.type);
    this.category(data.category);
    this.title(data.title);
    this.content(data.content);

};