70 rerefactor

[NorDar]

In the end my attempts at implementing everything with just userId's without breaking the db relations were futile.

There were a lot of race conditions when loading a plant from the database. It was not possible to generate the Id on the fly there.

I opted with a solution that is not according to the plan but looks like this:

POST to localhost:8080/plants that creates a plant with one owner and two caretakers:

{
    "plantName": "initialPlant",
    "species": "initialSpecies",
    "careInstructions": "Only water at night.",
    "lastWateringDate": "1910-11-09T23:00:00.000+00:00",
    "nextWateringDate": "1910-11-12T23:00:00.000+00:00",
    "wateringInterval": 3,
    "owner": {"id": 1},
    "caretakers": [{"id":2}, {"id":3}]
}

The following PUT will update the Plant:

{
    "plantName": "initialPlant",
    "species": "initialSpecies",
    "careInstructions": "Only water at night.",
    "lastWateringDate": "1910-11-09T23:00:00.000+00:00",
    "nextWateringDate": "1910-11-12T23:00:00.000+00:00",
    "wateringInterval": 3,
    "owner": {"id": 4},
    "caretakers": [
        {"id": 1}
    ]
}

Additionally: 70c554b0f1407e1d2d345a89dec60edbf8166abe fixes a small bug recognised while experimenting with eager loading. Persisted Plants can not be deleted until also removed from the relation.

[NorDar]

I am merging this so I can deploy it right now.