{
        might_have: {
            fetch: 0
        },
        has_many: {
            fetch: 0
        },
        sets: [{
            class: 'Artist',
            ids: ['1'],
            fetch: [{
                rel: cds,
                quantity: all
            }]
        }, {
            class: 'Artist',
            ids: ['2'],
            fetch: [{
                rel: cds,
                cond: { year: {'>': 2002} }
            }]
        }]
}