how to create cakephp and extjs grid CRUD,

=> I create controller for read and delete.

=> And in view/user/read.ctp and delete.ctp file build.

=> and js file create. in js file how to write

Code:
var proxy = new Ext.data.HttpProxy({
    api: {
        create:  { url: 'Ext.data.Api.actions.create',  method: 'POST' },
        read:    { url: '/users_controller/index',    method: 'GET'},
        update:  { url: '/users_controller/update',  method: 'POST' },
    destroy:  { url: '/users_controller/delete',  method: 'POST' }
    }
});
Is this API object is true ? its not getting controller function. Please replay, Thankyou,