Hi,

I want to make a sign_in and sign_out for my apiusing elixir with phoenix.
When i sign_in it create a user token but when i want to register this token on my “auth_tokens” table in db, i have this error :

INSERT INTO "auth_tokens" ("revoked","token","user_id","inserted_at","updated_at") VALUES ($1,$2,$3,$4,$5) RETURNING "id" [false, "SFMyNTY.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-RkAAhwYXNzd29yZGQAA25pbGQADXBhc3N3b3JkX2hhc2htAAAAPCQyYiQxMiRTcE8zTjR6TkVLemZzVm1Ic0pJaHZ1WW5VMy5sUTYzbzVJR3JTanVNdDNCMEU3N05kYVdjU2QACnVwZGF0ZWRfYXR0AAAACWQACl9fc3RydWN0X19kABRFbGl4aXIuTmFpdmVEYXRlVGltZWQACGNhbGVuZGFyZAATRWxpeGlyLkNhbGVuZGFyLklTT2QAA2RheWEaZAAEaG91cmEJZAALbWljcm9zZWNvbmRoAmEAYQBkAAZtaW51dGVhJmQABW1vbnRoYQpkAAZzZWNvbmRhHWQABHllYXJiAAAH5GQACHVzZXJuYW1lbQAAAAR0ZXN0bgYAF3tvZHUBYgABUYA.OGNA_ZeoMe5R4x4dtbpuRXew5JANJOz1nSNuRNe9CyQ", 5, ~N[2020-10-26 10:23:49], ~N[2020-10-26 10:23:49]]
[info] Sent 500 in 422ms
[error] #PID<0.658.0> running TimemanagerWeb.Endpoint (connection #PID<0.657.0>, stream id 1) terminated
Server: localhost:4000 (http)
Request: POST /api/sessions/sign_in
** (exit) an exception was raised:
    ** (Protocol.UndefinedError) protocol Enumerable not implemented for %{__meta__: #Ecto.Schema.Metadata<:loaded, "auth_tokens">, __struct__: Timemanager.Gotham.AuthToken, conn: %Plug.Conn{adapter: {Plug.Cowboy.Conn, :...}, assigns: %{__meta__: #Ecto.Schema.Metadata<:loaded, "auth_tokens">, __struct__: Timemanager.Gotham.AuthToken, id: 4, inserted_at: ~N[2020-10-26 10:23:49], layout: false, revoked: false, revoked_at: nil, token: "SFMyNTY.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-RkAAhwYXNzd29yZGQAA25pbGQADXBhc3N3b3JkX2hhc2htAAAAPCQyYiQxMiRTcE8zTjR6TkVLemZzVm1Ic0pJaHZ1WW5VMy5sUTYzbzVJR3JTanVNdDNCMEU3N05kYVdjU2QACnVwZGF0ZWRfYXR0AAAACWQACl9fc3RydWN0X19kABRFbGl4aXIuTmFpdmVEYXRlVGltZWQACGNhbGVuZGFyZAATRWxpeGlyLkNhbGVuZGFyLklTT2QAA2RheWEaZAAEaG91cmEJZAALbWljcm9zZWNvbmRoAmEAYQBkAAZtaW51dGVhJmQABW1vbnRoYQpkAAZzZWNvbmRhHWQABHllYXJiAAAH5GQACHVzZXJuYW1lbQAAAAR0ZXN0bgYAF3tvZHUBYgABUYA.OGNA_ZeoMe5R4x4dtbpuRXew5JANJOz1nSNuRNe9CyQ", updated_at: ~N[2020-10-26 10:23:49], user: #Ecto.Association.NotLoaded<association :user is not loaded>, user_id: 5}, before_send: [#Function<0.79951527/1 in Plug.Telemetry.call/2>], body_params: %{"email" => "test@test.fr", "password" => "1234", "username" => "test"}, cookies: %{}, halted: false, host: "localhost", method: "POST", owner: #PID<0.658.0>, params: %{"email" => "test@test.fr", "password" => "1234", "username" => "test"}, path_info: ["api", "sessions", "sign_in"], path_params: %{}, port: 4000, private: %{TimemanagerWeb.Router => {[], %{PhoenixSwagger.Plug.SwaggerUI => []}}, :phoenix_action => :create, :phoenix_controller => TimemanagerWeb.SessionsController, :phoenix_endpoint => TimemanagerWeb.Endpoint, :phoenix_format => "json", :phoenix_layout => {TimemanagerWeb.LayoutView, :app}, :phoenix_request_logger => {"request_logger", "request_logger"}, :phoenix_router => TimemanagerWeb.Router, :phoenix_template => "show.json", :phoenix_view => TimemanagerWeb.SessionsView, :plug_session_fetch => #Function<1.108087556/1 in Plug.Session.fetch_session/1>}, query_params: %{}, query_string: "", remote_ip: {127, 0, 0, 1}, req_cookies: %{}, req_headers: [{"accept", "*/*"}, {"accept-encoding", "gzip, deflate, br"}, {"connection", "keep-alive"}, {"content-length", "76"}, {"content-type", "application/json"}, {"host", "localhost:4000"}, {"postman-token", "d6b3602a-6636-4338-a4f1-fe62bd4e15de"}, {"user-agent", "PostmanRuntime/7.26.5"}], request_path: "/api/sessions/sign_in", resp_body: nil, resp_cookies: %{}, resp_headers: [{"cache-control", "max-age=0, private, must-revalidate"}, {"x-request-id", "FkGDxfxm0cAsEh0AAAwD"}], scheme: :http, script_name: [], secret_key_base: :..., state: :unset, status: 200}, id: 4, inserted_at: ~N[2020-10-26 10:23:49], layout: false, revoked: false, revoked_at: nil, token: "SFMyNTY.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-RkAAhwYXNzd29yZGQAA25pbGQADXBhc3N3b3JkX2hhc2htAAAAPCQyYiQxMiRTcE8zTjR6TkVLemZzVm1Ic0pJaHZ1WW5VMy5sUTYzbzVJR3JTanVNdDNCMEU3N05kYVdjU2QACnVwZGF0ZWRfYXR0AAAACWQACl9fc3RydWN0X19kABRFbGl4aXIuTmFpdmVEYXRlVGltZWQACGNhbGVuZGFyZAATRWxpeGlyLkNhbGVuZGFyLklTT2QAA2RheWEaZAAEaG91cmEJZAALbWljcm9zZWNvbmRoAmEAYQBkAAZtaW51dGVhJmQABW1vbnRoYQpkAAZzZWNvbmRhHWQABHllYXJiAAAH5GQACHVzZXJuYW1lbQAAAAR0ZXN0bgYAF3tvZHUBYgABUYA.OGNA_ZeoMe5R4x4dtbpuRXew5JANJOz1nSNuRNe9CyQ", updated_at: ~N[2020-10-26 10:23:49], user: #Ecto.Association.NotLoaded<association :user is not loaded>, user_id: 5} of type Timemanager.Gotham.AuthToken (a struct). This protocol is implemented for the following type(s): Ecto.Adapters.SQL.Stream, Postgrex.Stream, DBConnection.PrepareStream, DBConnection.Stream, Date.Range, File.Stream, Function, GenEvent.Stream, HashDict, HashSet, IO.Stream, List, Map, MapSet, Range, Stream

this is my schema :

schema "auth_tokens" do
    belongs_to :user, User
    field :revoked, :boolean, default: false
    field :revoked_at, :utc_datetime
    field :token, :string
    timestamps()
  end

this is my sign_in function :

def sign_in(email, password) do
    case Comeonin.Bcrypt.check_pass(Repo.get_by(User, email: email), password) do
      {:ok, user} ->
        token = Authenticator.generate_token(user)
        Repo.insert(Ecto.build_assoc(user, :auth_tokens, %{token: token}))
      err -> err
    end
  end

if someone can help me please