function to analyze store data then feed it to pie chart

[alex9311]

Hi everyone, so I have a store:

    Ext.define('AM.store.Users', {
        extend: 'Ext.data.Store',
        model: 'AM.model.User',
        data: [
            {Name: 'derp', Grade: 'FR'},
            {Name: 'herp', Grade: 'SR'},
                     ....
            {Name: 'beavis', Grade: 'SR'}
        ]
     });

And a chart:

Ext.define('AM.view.user.Chart' , {
        extend: 'Ext.chart.Chart',
        alias: 'widget.userchart',
                   ...(basic config stuff)...
        series: [{
                type: 'pie',
                //categoryField: 'Level',
                angleField: 'Level',
                showInLegend: true,
        }]
        //put functions here to analyze store?
    });

I want the pie chart to show the grade-level distribution in my store. Do I have to write functions that analyze the store and pass new values to the pi chart? If so, where would I stick those functions in MVC architecture? Sorry if this question is too broad, I'm a beginner in extjs

[scottmartin]

I am not sure I understand your request ...

Are you asking how to create calculated fields?
http://docs.sencha.com/ext-js/4-1/#!...ld-cfg-convert

If you need to create functions, you can create an 'class' and include it in your app as needed.
Scott.

[alex9311]

Thanks for the response scott, sorry my question was so unclear.

Basically I have a store with a groupField and I would like to display those groups in a pie chart. So the group field would be the grade level and the chart would show the relative amounts of students in each grade. I don't know if there is an easy way to display fieldGroups in pie charts or if I have to calculate new fields that count up the number of entries with FR as their grade and so forth