PUT does not update associated tables

[danvk]

I'm trying to use PUT to update a model with associations.

I have a Map model which HasMany Layers. Map 4 has one layer in the DB. map.json specifies two layers.

When I use PUT to update map 4, the request succeeds and returns a modified Map:

$ http PUT localhost:1337/object/map/4 < map.json
HTTP/1.1 200 OK
Connection: keep-alive
Content-Length: 514
Content-Type: application/json; charset=utf-8
Date: Tue, 01 Nov 2016 19:03:54 GMT
ETag: W/"202-avvKiF6AQG/hPzW3CJAakQ"
X-Powered-By: Express

{
    "author": "danvk",
    "baseMapStyle": "{}",
    "createdAt": "2016-11-01T16:05:30.086Z",
    "description": "This map has two layers",
    "id": 4,
    "lat": 43.22,
    "layer": [
        {
            "config": "config = {}",
            "description": "It's a really great layer, trust me.",
            "name": "My layer",
            "sqlQuery": "SELECT * FROM dataset",
            "zIndex": 0
        },
        {
            "config": "config = {}",
            "description": "It's an even better layer, trust me.",
            "name": "My layer",
            "sqlQuery": "SELECT * FROM dataset",
            "zIndex": 1
        }
    ],
    "lng": -137.22,
    "name": "My Map",
    "updatedAt": "2016-11-01T19:03:54.447Z",
    "zoomLevel": 12
}

A subsequent GET, however, shows that the new data wasn't written to the database:

$ http GET localhost:1337/object/map/4                
HTTP/1.1 200 OK
Connection: keep-alive
Content-Length: 744
Content-Type: application/json; charset=utf-8
Date: Tue, 01 Nov 2016 19:12:39 GMT
ETag: W/"2e8-bsUeBJOAcTqI1e8ugkbqpg"
X-Powered-By: Express

{
    "author": "danvk",
    "baseMapStyle": "{}",
    "createdAt": "2016-11-01T16:05:30.086Z",
    "description": "This map has two layers",
    "id": 4,
    "lat": 43.22,
    "layer": [
        {
            "SavedMapId": 4,
            "createdAt": "2016-11-01T16:05:30.123Z",
            "description": null,
            "id": 3,
            "name": "Untitled Layer",
            "sqlQuery": "SELECT *\nFROM blah",
            "updatedAt": "2016-11-01T16:05:30.123Z",
            "zIndex": 1
        }
    ],
    "lng": -137.22,
    "name": "My Map",
    "updatedAt": "2016-11-01T19:03:54.447Z",
    "zoomLevel": 12
}

I'm running from HEAD using Postgres.

[danvk]

cc @asmodehn