log of $department:

{
    name: "Logistics"
    description: "they deal with logistics
}

log of $department->employees:

[
    {
        name: "bob"
        age: 22
    },
    {
        ...
    }
]

I now want to have a department object like this:

{
    name: "Logistics",
    description: "they deal with logistics,
    employees: [
        {
            name: "bob"
            age: 22
        },
        {
            ...
        }
    ]
}