How to set default column renderer by column type in ExtJS?

Question

I've a grid in ExtJS 4.2 and I need to set default renderer for its columns by type. It means that I've a renderer function for each grid column type (a renderer for Boolean columns, another for Date columns, another for Number columns, etc) and I want to change default renderer by column type globally (I can't set it individually for each grid column because I can't change legacy code).
Any idea?

Answer 1

Just some links:
- Best practice for overwriting classes properties
- Steps to overriding Sencha ExtJS standard component functionality
- Overriding Extjs classes and invoking callParent
You should overwrite the Boolean column type (and other also) once and it (they) will be used everywhere.

Answer 2

use this override for boolean column and same this code for other column type :

Ext.define('MyBooleanColumn',{
    override: 'Ext.grid.column.Boolean',
    renderer:function(v){
       // write your own customization code here
       return v;
    }
});