First grid in fiddle loads association ok, second one not: http://ift.tt/1ClLouP

ExtJs version: 5.1.0.107



Code:



Ext.define('BaseModel', {
    extend: 'Ext.data.Model',
    schema: {
        urlPrefix: '/data',
        proxy: {
            type: 'rest',
            url: '{prefix}/{entityName:lowercase}',
            reader: {
                type: 'json',
                rootProperty: 'data'
            }
        }
    }
});


Ext.define('User', {
    extend: 'BaseModel',
    fields: ['id', 'name', {
        name: 'groupId',
        reference: 'Group'
    }]
});


Ext.define('Group', {
    extend: 'BaseModel',
    fields: ['id', 'name']
});


Ext.define('UsersGrid', {
    xtype: 'usersgrid',
    extend: 'Ext.grid.GridPanel',
    forceFit: true,
    border: 1,
    fields: ['id', 'groupname'],
    columns: [{
        dataIndex: 'id',
        text: 'id'
    }, {
        dataIndex: 'name',
        text: 'name'
    }]
});




Ext.onReady(function() {


    var session=Ext.create('Ext.data.Session');
    
    var vp=Ext.create('Ext.container.Viewport', {            
        layout: {
            type: 'vbox',
            align: 'stretch',
            pack: 'start'
        },
        items: [{
            flex: 1,
            number: 1,
            viewModel: {
                links: {
                    group: { type: 'Group', id: 1 }  
                }
            },
            bind: {
                title: '{group.name}'
            },
            items: [{
                xtype: 'usersgrid',
                bind: '{group.users}'
                
            }]
        }, {
            flex: 1,
            number: 2,
            session: session, // <--- We added session here !!!!
            viewModel: {
                links: {
                    group: { type: 'Group', id: 1 }  
                }
            },
            bind: {
                title: '{group.name}'
            },
            items: [{
                xtype: 'usersgrid',
                bind: '{group.users}'
            }]
        }]
    });            


});