Error implementing JaSerializer

error.ex

3) test update happy path (ContactWeb.Api.V1.RoomControllerTest)
     test/contact_web/controllers/api/v1/room_controller_test.exs:37
     ** (UndefinedFunctionError) function ContactWeb.Api.V1.RoomSerializer.preload/3 is undefined (module ContactWeb.Api.V1.RoomSerializer is not available)
     code: conn = patch(conn, "/api/v1/rooms/#{room.id}", body)
     stacktrace:
       ContactWeb.Api.V1.RoomSerializer.preload(%Contact.Rooms.Room{__meta__: #Ecto.Schema.Metadata<:loaded, "rooms">, id: 190, inserted_at: ~N[2018-01-23 12:34:24.449648], name: "Burger King", owner: %Contact.Accounts.User{__meta__: #Ecto.Schema.Metadata<:loaded, "users">, email: "email-15@example.com", first_name: "Mitch", id: 4418, inserted_at: ~N[2018-01-23 12:34:24.808554], last_name: "Hanberg", password: nil, password_confirmation: nil, password_digest: "$2b$12$LZxfqgV1otbpIdvLvGBL4OjMhTWii9vicr2lWFVXDQVR6dFJVaFdO", teams: #Ecto.Association.NotLoaded<association :teams is not loaded>, updated_at: ~N[2018-01-23 12:34:24.808564], username: "user14"}, owner_id: 4418, updated_at: ~N[2018-01-23 12:34:24.815810]}, %{}, [])
       (ja_serializer) lib/ja_serializer/builder/top_level.ex:26: JaSerializer.Builder.TopLevel.build/1
       (ja_serializer) lib/ja_serializer.ex:59: JaSerializer.format/4
       (phoenix) lib/phoenix/view.ex:332: Phoenix.View.render_to_iodata/3
       (phoenix) lib/phoenix/controller.ex:740: Phoenix.Controller.do_render/4
       (contact) lib/contact_web/controllers/api/v1/room_controller.ex:1: ContactWeb.Api.V1.RoomController.action/2
       (contact) lib/contact_web/controllers/api/v1/room_controller.ex:1: ContactWeb.Api.V1.RoomController.phoenix_controller_pipeline/2
       (contact) lib/contact_web/endpoint.ex:1: ContactWeb.Endpoint.instrument/4
       (phoenix) lib/phoenix/router.ex:278: Phoenix.Router.__call__/1
       (contact) lib/contact_web/endpoint.ex:1: ContactWeb.Endpoint.plug_builder_call/2
       (contact) lib/contact_web/endpoint.ex:1: ContactWeb.Endpoint.call/2
       (phoenix) lib/phoenix/test/conn_test.ex:224: Phoenix.ConnTest.dispatch/5
       test/contact_web/controllers/api/v1/room_controller_test.exs:51: (test)

Mix.lock

%{"apex": {:hex, :apex, "1.2.0", "2da5035ef5fc59da2c24187a880b1b6d38b6b67c19b89a6265f5986ff0e85b1f", [:mix], [], "hexpm"},
  "base64url": {:hex, :base64url, "0.0.1", "36a90125f5948e3afd7be97662a1504b934dd5dac78451ca6e9abf85a10286be", [:rebar], [], "hexpm"},
  "bcrypt_elixir": {:hex, :bcrypt_elixir, "1.0.5", "cca70b5c8d9a98a0151c2d2796c728719c9c4b3f8bd2de015758ef577ee5141e", [:make, :mix], [{:elixir_make, "~> 0.4", [hex: :elixir_make, repo: "hexpm", optional: false]}], "hexpm"},
  "comeonin": {:hex, :comeonin, "4.0.3", "4e257dcb748ed1ca2651b7ba24fdbd1bd24efd12482accf8079141e3fda23a10", [:mix], [{:argon2_elixir, "~> 1.2", [hex: :argon2_elixir, repo: "hexpm", optional: true]}, {:bcrypt_elixir, "~> 0.12.1 or ~> 1.0", [hex: :bcrypt_elixir, repo: "hexpm", optional: true]}, {:pbkdf2_elixir, "~> 0.12", [hex: :pbkdf2_elixir, repo: "hexpm", optional: true]}], "hexpm"},
  "connection": {:hex, :connection, "1.0.4", "a1cae72211f0eef17705aaededacac3eb30e6625b04a6117c1b2db6ace7d5976", [:mix], [], "hexpm"},
  "cowboy": {:hex, :cowboy, "1.1.2", "61ac29ea970389a88eca5a65601460162d370a70018afe6f949a29dca91f3bb0", [:rebar3], [{:cowlib, "~> 1.0.2", [hex: :cowlib, repo: "hexpm", optional: false]}, {:ranch, "~> 1.3.2", [hex: :ranch, repo: "hexpm", optional: false]}], "hexpm"},
  "cowlib": {:hex, :cowlib, "1.0.2", "9d769a1d062c9c3ac753096f868ca121e2730b9a377de23dec0f7e08b1df84ee", [:make], [], "hexpm"},
  "db_connection": {:hex, :db_connection, "1.1.3", "89b30ca1ef0a3b469b1c779579590688561d586694a3ce8792985d4d7e575a61", [:mix], [{:connection, "~> 1.0.2", [hex: :connection, repo: "hexpm", optional: false]}, {:poolboy, "~> 1.5", [hex: :poolboy, repo: "hexpm", optional: true]}, {:sbroker, "~> 1.0", [hex: :sbroker, repo: "hexpm", optional: true]}], "hexpm"},
  "decimal": {:hex, :decimal, "1.4.1", "ad9e501edf7322f122f7fc151cce7c2a0c9ada96f2b0155b8a09a795c2029770", [:mix], [], "hexpm"},
  "ecto": {:hex, :ecto, "2.2.8", "a4463c0928b970f2cee722cd29aaac154e866a15882c5737e0038bbfcf03ec2c", [:mix], [{:db_connection, "~> 1.1", [hex: :db_connection, repo: "hexpm", optional: true]}, {:decimal, "~> 1.2", [hex: :decimal, repo: "hexpm", optional: false]}, {:mariaex, "~> 0.8.0", [hex: :mariaex, repo: "hexpm", optional: true]}, {:poison, "~> 2.2 or ~> 3.0", [hex: :poison, repo: "hexpm", optional: true]}, {:poolboy, "~> 1.5", [hex: :poolboy, repo: "hexpm", optional: false]}, {:postgrex, "~> 0.13.0", [hex: :postgrex, repo: "hexpm", optional: true]}, {:sbroker, "~> 1.0", [hex: :sbroker, repo: "hexpm", optional: true]}], "hexpm"},
  "elixir_make": {:hex, :elixir_make, "0.4.0", "992f38fabe705bb45821a728f20914c554b276838433349d4f2341f7a687cddf", [:mix], [], "hexpm"},
  "ex_machina": {:hex, :ex_machina, "2.1.0", "4874dc9c78e7cf2d429f24dc3c4005674d4e4da6a08be961ffccc08fb528e28b", [:mix], [{:ecto, "~> 2.1", [hex: :ecto, repo: "hexpm", optional: true]}], "hexpm"},
  "file_system": {:hex, :file_system, "0.2.4", "f0bdda195c0e46e987333e986452ec523aed21d784189144f647c43eaf307064", [:mix], [], "hexpm"},
  "gettext": {:hex, :gettext, "0.14.0", "1a019a2e51d5ad3d126efe166dcdf6563768e5d06c32a99ad2281a1fa94b4c72", [:mix], [], "hexpm"},
  "guardian": {:hex, :guardian, "1.0.1", "db0fbaf571c3b874785818b7272eaf5f1ed97a2f9b1f8bc5dc8b0fb8f8f7bb06", [:mix], [{:jose, "~> 1.8", [hex: :jose, repo: "hexpm", optional: false]}, {:phoenix, "~> 1.0 or ~> 1.2 or ~> 1.3", [hex: :phoenix, repo: "hexpm", optional: true]}, {:plug, "~> 1.3.3 or ~> 1.4", [hex: :plug, repo: "hexpm", optional: true]}, {:poison, "~> 2.2 or ~> 3.0", [hex: :poison, repo: "hexpm", optional: false]}, {:uuid, ">= 1.1.1", [hex: :uuid, repo: "hexpm", optional: false]}], "hexpm"},
  "inflex": {:hex, :inflex, "1.9.0", "2bef01a84437bca0a12fc107821ae7771b0ba847dccab5d1cd61f35972e66813", [:mix], [], "hexpm"},
  "ja_serializer": {:hex, :ja_serializer, "0.12.0", "ba4ec5fc7afa6daba815b5cb2b9bd0de410554ac4f0ed54e954d39decb353ca4", [:mix], [{:inflex, "~> 1.4", [hex: :inflex, repo: "hexpm", optional: false]}, {:plug, "> 1.0.0", [hex: :plug, repo: "hexpm", optional: false]}, {:poison, ">= 1.4.0", [hex: :poison, repo: "hexpm", optional: false]}, {:scrivener, "~> 1.2 or ~> 2.0", [hex: :scrivener, repo: "hexpm", optional: true]}], "hexpm"},
  "jose": {:hex, :jose, "1.8.4", "7946d1e5c03a76ac9ef42a6e6a20001d35987afd68c2107bcd8f01a84e75aa73", [:mix, :rebar3], [{:base64url, "~> 0.0.1", [hex: :base64url, repo: "hexpm", optional: false]}], "hexpm"},
  "mime": {:hex, :mime, "1.2.0", "78adaa84832b3680de06f88f0997e3ead3b451a440d183d688085be2d709b534", [:mix], [], "hexpm"},
  "phoenix": {:hex, :phoenix, "1.3.0", "1c01124caa1b4a7af46f2050ff11b267baa3edb441b45dbf243e979cd4c5891b", [:mix], [{:cowboy, "~> 1.0", [hex: :cowboy, repo: "hexpm", optional: true]}, {:phoenix_pubsub, "~> 1.0", [hex: :phoenix_pubsub, repo: "hexpm", optional: false]}, {:plug, "~> 1.3.3 or ~> 1.4", [hex: :plug, repo: "hexpm", optional: false]}, {:poison, "~> 2.2 or ~> 3.0", [hex: :poison, repo: "hexpm", optional: false]}], "hexpm"},
  "phoenix_ecto": {:hex, :phoenix_ecto, "3.3.0", "702f6e164512853d29f9d20763493f2b3bcfcb44f118af2bc37bb95d0801b480", [:mix], [{:ecto, "~> 2.1", [hex: :ecto, repo: "hexpm", optional: false]}, {:phoenix_html, "~> 2.9", [hex: :phoenix_html, repo: "hexpm", optional: true]}, {:plug, "~> 1.0", [hex: :plug, repo: "hexpm", optional: false]}], "hexpm"},
  "phoenix_html": {:hex, :phoenix_html, "2.10.5", "4f9df6b0fb7422a9440a73182a566cb9cbe0e3ffe8884ef9337ccf284fc1ef0a", [:mix], [{:plug, "~> 1.0", [hex: :plug, repo: "hexpm", optional: false]}], "hexpm"},
  "phoenix_live_reload": {:hex, :phoenix_live_reload, "1.1.3", "1d178429fc8950b12457d09c6afec247bfe1fcb6f36209e18fbb0221bdfe4d41", [:mix], [{:file_system, "~> 0.2.1 or ~> 0.3", [hex: :file_system, repo: "hexpm", optional: false]}, {:phoenix, "~> 1.0 or ~> 1.2 or ~> 1.3", [hex: :phoenix, repo: "hexpm", optional: false]}], "hexpm"},
  "phoenix_pubsub": {:hex, :phoenix_pubsub, "1.0.2", "bfa7fd52788b5eaa09cb51ff9fcad1d9edfeb68251add458523f839392f034c1", [:mix], [], "hexpm"},
  "plug": {:hex, :plug, "1.4.3", "236d77ce7bf3e3a2668dc0d32a9b6f1f9b1f05361019946aae49874904be4aed", [:mix], [{:cowboy, "~> 1.0.1 or ~> 1.1", [hex: :cowboy, repo: "hexpm", optional: true]}, {:mime, "~> 1.0", [hex: :mime, repo: "hexpm", optional: false]}], "hexpm"},
  "poison": {:hex, :poison, "3.1.0", "d9eb636610e096f86f25d9a46f35a9facac35609a7591b3be3326e99a0484665", [:mix], [], "hexpm"},
  "poolboy": {:hex, :poolboy, "1.5.1", "6b46163901cfd0a1b43d692657ed9d7e599853b3b21b95ae5ae0a777cf9b6ca8", [:rebar], [], "hexpm"},
  "postgrex": {:hex, :postgrex, "0.13.3", "c277cfb2a9c5034d445a722494c13359e361d344ef6f25d604c2353185682bfc", [:mix], [{:connection, "~> 1.0", [hex: :connection, repo: "hexpm", optional: false]}, {:db_connection, "~> 1.1", [hex: :db_connection, repo: "hexpm", optional: false]}, {:decimal, "~> 1.0", [hex: :decimal, repo: "hexpm", optional: false]}], "hexpm"},
  "ranch": {:hex, :ranch, "1.3.2", "e4965a144dc9fbe70e5c077c65e73c57165416a901bd02ea899cfd95aa890986", [:rebar3], [], "hexpm"},
  "uuid": {:hex, :uuid, "1.1.8", "e22fc04499de0de3ed1116b770c7737779f226ceefa0badb3592e64d5cfb4eb9", [:mix], [], "hexpm"}}

notes.md

Schemas

• The Room schema has a belongs_to relationship to a User
• The User schema has a has_many relationship to a set of Teams
• The Team schema has a many_to_many relationship to a set of Users

Versions

• elixir: 1.6.0
• ja_serializer: 0.12.0

room_controller.ex

def update(conn, %{"data" => data}) do
  attrs = JaSerializer.Params.to_attributes(data)
  id = data["id"]

  with {:ok, %Room{} = room} <- Rooms.update_room(id, attrs) do
    render(conn, "show.json-api", room: room)
  end
end

room_serializer.ex

defmodule ContactWeb.Api.V1.RoomsSerializer do
  use JaSerializer

  location("/api/v1/rooms/:id")
  attributes([:name])

  has_one(
    :owner,
    field: :owner_id,
    type: "user",
    serializer: ContactWeb.Api.V1.UserSerializer,
    include: true
  )
end

room_view.ex

defmodule ContactWeb.Api.V1.RoomView do
  use ContactWeb, :view
  alias ContactWeb.Api.V1.RoomSerializer

  def render("show.json-api", %{room: room}) do
    RoomSerializer
    |> JaSerializer.format(room)
  end

  def render("delete.json-api", _assigns) do
    ""
  end
end