Assign role to user on register

user_to_app_to_role_by_user_id didn't work for me.

I had to use user_to_app_to_role:

curl -X PATCH --header 'Content-Type: application/json' --header 'Accept: application/json' --header 'X-DreamFactory-Api-Key: 36fda24fe5588fa4285ac6c6c2fdfbdb6b6bc9834699774c9bf777f706d05a88' --header 'X-DreamFactory-Session-Token: ' --header 'Authorization: Basic Y3J5c3RhbEBidWlsZG15YXBwLnRvZGF5OmhGOV40WFAyQFJUbQ==' -d '{

"user_to_app_to_role": [
    {
        "user_id": 14,
        "app_id": 7,
        "role_id": 4
    }
]

}' 'http:///api/v2/system/user/14'