Should not overwrite _access if it is not provided in save request payload

[carmenlau]

Origanal object:

{
    "_access": [
        {
            "level": "read",
            "public": true
        }
    ],
    "_created_at": "2016-04-28T08:14:16.531024Z",
    "_created_by": "f3c547cf-130d-41bc-bc31-64f29dcfc18a",
    "_id": "TailormTailorTranslation/2f596451-06a3-4cec-a7d5-f01df372ad5c",
    "_ownerID": "f3c547cf-130d-41bc-bc31-64f29dcfc18a",
    "_type": "record",
    "_updated_at": "2016-05-25T06:07:21.786447Z",
    "_updated_by": "f3c547cf-130d-41bc-bc31-64f29dcfc18a",
    "address": "Workshop Unit B, 9/F, Wah Wai Industrial Building, No 1-7 Wo Heung St, Fo Tan, Shatin, Hong Kong",
    "description": "1\n2\n3\n4\n5\n6\n\n7",
    "geolocation": {
        "$lat": 22.396428,
        "$lng": 114.109497,
        "$type": "geo"
    },
    "locale": "en-US",
    "page_name": "Carmen Eng",
    "tailor": {
        "$id": "TailormTailor/ff3b6121-ef79-4ce3-a483-2acc26e62d9a",
        "$type": "ref"
    }
}

Update curl:

curl 'http://api.tailorm.dev/record/save' -H 'Pragma: no-cache' -H 'Origin: http://portal.tailorm.dev' -H 'Accept-Encoding: gzip, deflate' -H 'X-Skygear-Access-Token: 3e0add12-f662-4ae3-9936-c5737024816b' -H 'Accept-Language: en-US,en;q=0.8,zh-CN;q=0.6,zh;q=0.4,zh-TW;q=0.2' -H 'User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.102 Safari/537.36' -H 'Content-Type: application/json' -H 'Accept: application/json' -H 'Cache-Control: no-cache' -H 'Referer: http://portal.tailorm.dev/details' -H 'Connection: keep-alive' -H 'X-Skygear-API-Key: tailorm-key' --data-binary '{"action":"record:save","api_key":"tailorm-key","access_token":"3e0add12-f662-4ae3-9936-c5737024816b","database_id":"_public","records":[{"_id":"TailormTailorTranslation/2f596451-06a3-4cec-a7d5-f01df372ad5c","page_name":"Carmen Eng","address":"Workshop Unit B, 9/F, Wah Wai Industrial Building, No 1-7 Wo Heung St, Fo Tan, Shatin, Hong Kong","tailor":{"$id":"TailormTailor/ff3b6121-ef79-4ce3-a483-2acc26e62d9a","$type":"ref"},"locale":"en-US"}]}' --compressed

Response:

{
    "result": [
        {
            "_access": null,
            "_created_at": "2016-04-28T08:14:16.531024Z",
            "_created_by": "f3c547cf-130d-41bc-bc31-64f29dcfc18a",
            "_id": "TailormTailorTranslation/2f596451-06a3-4cec-a7d5-f01df372ad5c",
            "_ownerID": "f3c547cf-130d-41bc-bc31-64f29dcfc18a",
            "_type": "record",
            "_updated_at": "2016-05-25T06:07:55.537599Z",
            "_updated_by": "f3c547cf-130d-41bc-bc31-64f29dcfc18a",
            "address": "Workshop Unit B, 9/F, Wah Wai Industrial Building, No 1-7 Wo Heung St, Fo Tan, Shatin, Hong Kong",
            "description": "1\n2\n3\n4\n5\n6\n\n7",
            "geolocation": {
                "$lat": 22.396428,
                "$lng": 114.109497,
                "$type": "geo"
            },
            "locale": "en-US",
            "page_name": "Carmen Eng",
            "tailor": {
                "$id": "TailormTailor/ff3b6121-ef79-4ce3-a483-2acc26e62d9a",
                "$type": "ref"
            }
        }
    ]
}