model.attendance.js

model.attendance.js

define('model.attendance',
    ['ko'],
    function (ko) {

        var attendanceMakeId = function (personId, sessionId) {
            return (personId + ',' + sessionId);
        };

        var Attendance = function () {
            var self = this;
            self.sessionId = ko.observable();
            self.personId = ko.observable();

            // id is string compound key {personId,sessionId} like '3,10'    
            self.id = ko.computed({
                read: function () {
                    return attendanceMakeId(self.personId(), self.sessionId());
                },
                write: function (value) {
                    var idparts = value.split(',');
                    self.personId(parseInt(idparts[0]));
                    self.sessionId(parseInt(idparts[1]));
                }
            }),

            self.rating = ko.observable();
            self.text = ko.observable();
            self.isNullo = false;
            self.dirtyFlag = new ko.DirtyFlag([self.rating, self.text]);
            return self;
        };

        Attendance.Nullo = new Attendance()
            .sessionId(0)
            .personId(0)
            .rating(0)
            .text('');

        Attendance.Nullo.isNullo = true;
        Attendance.Nullo.dirtyFlag().reset();

        Attendance.prototype = function () {
            var
                person = function () {
                    return datacontext.persons.getLocalById(self.personId());
                },
                session = function () {
                    return datacontext.sessions.getLocalById(self.sessionId());
                };
            return {
                isNullo: false,
                person: person,
                session: session
            };
        }();

        return {
            Attendance: Attendance
        };
});