I have models like this.

Code:



Ext.define('App.model.Parent',{
    extend: 'Ext.data.Model' ,
    idProperty: 'parentId',
    fields: [
        {name: 'parentId'},
        {name: 'parentField'}
    ]
});

Ext.define('App.model.Header',{
    extend: 'Ext.data.Model' ,
    idProperty: 'headerId',
    fields: [
        {name: 'headerId'},
        {
            name: 'parentId',
            reference: {
                type: 'App.model.Parent',
                role: 'parent',
                inverse: 'headers'
            }
        },
        {name: 'headerField'}
    ]
});

Ext.define('App.model.Detail',{
    extend: 'Ext.data.Model' ,
    idProperty: 'detailId',
    fields: [
        {name: 'detailId'},
        {
            name: 'headerId',
            reference: {
                type: 'App.model.Header',
                role: 'header',
                inverse: {
                    role: 'details',
                    storeConfig: {
                        type: 'detail'
                    }
                }
            }
        },
        {name: 'detailField'}
    ]
});

When I create record using 'POST' method and sent back the json data, the third level (detail) doesn't show on 'details' association.