Avoid syncing certain parts of a model

Question

Let's say I have a Sencha Touch model like this:

Ext.regModel('User', {
    'fields': [{
        'name': 'first_name',
        'type': 'string'
     }, {
        'name': 'last_name',
        'type': 'string'
     }, {
        'name': 'full_name',
        'type': 'string',
        'convert': function(v, record) {
            return record.data.first_name + ' ' + record.data.last_name;
        }
     }, {
        'name': 'age',
        'type': 'integer'
     }
]});

The server returns the 'first_name', 'last_name', and 'age' fields when getting records. However, when I update a user's first and/or last name, and I call sync() on the store, it will send all fields to the server, including full_name and age, even though I don't want that.

I know I could just ignore that data on the server, but in some cases (with lots of fields with 'convert' for example) it adds lots of unnecessary overhead to the payload.

Answer 1

Have you tried the config persist: false for the field?

Edit I guess you could create your own writer for the proxy and override the getRecordData method.

Ext.define('Ext.ux.NewWriter', {
    extend: 'Ext.data.Writer',
    getRecordData: function(record) {
        return {
            first_name: record.data.first_name,
            last_name: record.data.last_name,
            age: record.data.age
        };
    }
});

...
proxy: {
    writer: Ext.create('Ext.ux.NewWriter');
}

Hope it helps