// student
{
_id: 8765
name: 'bob',
cohort: {
_id: 1234
startDate: "1990-01-01",
campus: "paris"
}
}
// cohort
{
_id: 1234
startDate: "1990-01-01",
campus: "paris"
}
// student
{
_id: 8765
name: 'bob',
cohort: {
_id: 1234
startDate: "1990-01-01",
campus: "paris"
}
}
// cohort
{
_id: 1234
startDate: "1990-01-01",
campus: "paris"
}