Relationship partial loading

[gordonkristan]

Add the ability for the store to accept partial records, merging them with old records. The number one use case for this is pagination. When 50 IDs are loaded, to load the next 50, there's no reason to re-load the old 50.

[gordonkristan]

This should work for attributes as well as relationships. This way record updates don't have to return the full record.

[gordonkristan]

I really hate the RFC6902 PATCH format, so I'm not going to use it in the normalized payload format. However, I do think we can do something similar (vs a Mongo like syntax).

{
    "id": "1",
    "type": "user",
    "op": "add",
    "type": "relationship",
    "property": "posts",
    "value": {
        "id": "10",
        "type": "post"
    }
}

These would possibly reside in a changes object. I'm thinking the format might move to something like this:

{
    "meta": {},
    "records": {},
    "changes": {
        "user": {
            "1": [
                {}, {}, {}
            ]
        }
    }
}

This would keep the changes grouped for easy loading.