For the record, when implementing TvEpisode and TvSeason, I couldn't append Account_states either.

Hi guys,

I've created a new ticket for this here. I'll look at it next week.

Hmm, all of my tests for series, seasons and episodes are working with one of my sessions:

Request:

https://api.themoviedb.org/3/tv/1399?api_key=###&session_id=###&append_to_response=account_states

Response

{
  "account_states": {
    "favorite": true,
    "rated": {
      "value": 9.0
    },
    "watchlist": false
  },
  "backdrop_path": "/aKz3lXU71wqdslC1IYRC3yHD6yw.jpg",
  "created_by": [
    {
      "id": 9813,
      "name": "David Benioff",
      "profile_path": "/8CuuNIKMzMUL1NKOPv9AqEwM7og.jpg"
    },
    {
      "id": 228068,
      "name": "D. B. Weiss",
      "profile_path": null
    }
  ],
  "episode_run_time": [
    60
  ],
  ...
}

Request

https://api.themoviedb.org/3/tv/1399/season/1?api_key=###&session_id=###&append_to_response=account_states

Response

{
  "account_states": {
    "results": [
      {
        "id": 63056,
        "episode_number": 1,
        "rated": {
          "value": 9.0
        }
      },
      {
        "id": 63057,
        "episode_number": 2,
        "rated": false
      },
      {
        "id": 63058,
        "episode_number": 3,
        "rated": false
      },
      {
        "id": 63059,
        "episode_number": 4,
        "rated": false
      },
      {
        "id": 63060,
        "episode_number": 5,
        "rated": false
      },
      {
        "id": 63061,
        "episode_number": 6,
        "rated": false
      },
      {
        "id": 63062,
        "episode_number": 7,
        "rated": false
      },
      {
        "id": 63063,
        "episode_number": 8,
        "rated": false
      },
      {
        "id": 63064,
        "episode_number": 9,
        "rated": false
      },
      {
        "id": 63065,
        "episode_number": 10,
        "rated": false
      }
    ]
  },
  "air_date": "2011-04-17",
  ...
}

Request

https://api.themoviedb.org/3/tv/1399/season/1/episode/1?api_key=###&session_id=###&append_to_response=account_states

Response

{
  "account_states": {
    "rated": {
      "value": 9.0
    }
  },
  "air_date": "2011-04-17",
  ...
}

Are you sure you're calling the methods with a session that has rated or marked one of the items (as a favourite or watch list)?

I'm pretty sure they are neither. But is it necessary to do that?

If so, we'll have to make a workaround which creates the object if it's not there and fills in blanks, so that the end user will get the same experience every time they call the API (can't have stuff being null if you explicitly asked for it).

You don't need to have done any of the account actions on the item (rated, watchlist or favorite) but you do need a valid session_id for the account_sates field to show up.

I can call any arbitrary item and get back you'd expect:

http://api.themoviedb.org/3/tv/62413?api_key=###&session_id=###&append_to_response=account_states

{
  "account_states": {
    "favorite": false,
    "rated": false,
    "watchlist": false
  },
  "backdrop_path": "/heXGzDx18UCQALqUKSLwasp5j18.jpg",
  "created_by": [],
  "episode_run_time": [
    60
  ],
  "first_air_date": "2015-06-19",
  "genres": [
    {
      "id": 878,
      "name": "Science Fiction"
    },
  ],
  ...
}

Oooh.. Might be we missed the session id.. Makes sense.