JaResource from_attributes

config.exs

# This file is responsible for configuring your application
# and its dependencies with the aid of the Mix.Config module.
#
# This configuration file is loaded before any dependency and
# is restricted to this project.
use Mix.Config

# General application configuration
config :starlit_server,
  ecto_repos: [StarlitServer.Repo]

# Configures the endpoint
config :starlit_server, StarlitServer.Endpoint,
  url: [host: "localhost"],
  secret_key_base: "keJVG/4GiUY/4Vq8FX1BJP+c+D91a+BKIdvm+LVX3SDCjFSsW8TRPkqkRGisgDk0",
  render_errors: [view: StarlitServer.ErrorView, accepts: ~w(html json)],
  pubsub: [name: StarlitServer.PubSub,
           adapter: Phoenix.PubSub.PG2]

# Configures Elixir's Logger
config :logger, :console,
  format: "$time $metadata[$level] $message\n",
  metadata: [:request_id]

# Import environment specific config. This must remain at the bottom
# of this file so it overrides the configuration defined above.
import_config "#{Mix.env}.exs"

config :guardian, Guardian,
  issuer: "StarlitServer",
  ttl: { 30, :days },
  allowed_drift: 2000,
  verify_issuer: true, # optional
  secret_key: System.get_env("GUARDIAN_SECRET_KEY"),
  serializer: StarlitServer.GuardianSerializer

config :canary, repo: StarlitServer.Repo
config :canary, unauthorized_handler: {StarlitServer.AuthenticationHelpers, :handle_unauthorized}
config :canary, not_found_handler: {StarlitServer.AuthenticationHelpers, :handle_not_found}

config :ja_resource,
  repo: StarlitServer.Repo

mix.exs

defmodule StarlitServer.Mixfile do
  use Mix.Project

  def project do
    [app: :starlit_server,
     version: "0.0.1",
     elixir: "~> 1.2",
     elixirc_paths: elixirc_paths(Mix.env),
     compilers: [:phoenix, :gettext] ++ Mix.compilers,
     build_embedded: Mix.env == :prod,
     start_permanent: Mix.env == :prod,
     aliases: aliases(),
     deps: deps()]
  end

  # Configuration for the OTP application.
  #
  # Type `mix help compile.app` for more information.
  def application do
    [mod: {StarlitServer, []},
     applications: [:phoenix, :phoenix_pubsub, :phoenix_html, :cowboy, :logger, :gettext,
                    :phoenix_ecto, :postgrex, :ja_resource]]
  end

  # Specifies which paths to compile per environment.
  defp elixirc_paths(:test), do: ["lib", "web", "test/support"]
  defp elixirc_paths(_),     do: ["lib", "web"]

  # Specifies your project dependencies.
  #
  # Type `mix help deps` for examples and options.
  defp deps do
    [
      {:bamboo, "~> 0.7"}, # emails
      {:bamboo_postmark, "~> 0.2.0"}, # postmark adapter for emails
      {:phoenix, "~> 1.2.1"},
      {:phoenix_pubsub, "~> 1.0"},
      {:phoenix_ecto, "~> 3.0"},
      {:postgrex, ">= 0.0.0"},
      {:phoenix_html, "~> 2.6"},
      {:phoenix_live_reload, "~> 1.0", only: :dev},
      {:gettext, "~> 0.11"},
      {:cowboy, "~> 1.0"},
      {:canary, "~> 1.1"}, # Authorization
      {:cloudex, "~> 0.1.10"},
      {:comeonin, "~> 2.0"},
      {:corsica, "~> 0.4"}, # CORS
      {:guardian, "~> 0.14"}, # Authentication (JWT)
      {:ja_resource, "~> 0.2"},
      {:ja_serializer, "~> 0.11.0"}, # JSON API
    ]
  end

  # Aliases are shortcuts or tasks specific to the current project.
  # For example, to create, migrate and run the seeds file at once:
  #
  #     $ mix ecto.setup
  #
  # See the documentation for `Mix` for more info on aliases.
  defp aliases do
    ["ecto.setup": ["ecto.create", "ecto.migrate", "run priv/repo/seeds.exs"],
     "ecto.reset": ["ecto.drop", "ecto.setup"],
     "ecto.migrate": ["ecto.migrate", "ecto.dump"],
     "test": ["ecto.create --quiet", "ecto.migrate", "test"]]
  end
end

stacktrace.txt

(exit) an exception was raised:
    ** (FunctionClauseError) no function clause matching in JaResource.Attributes.from_params/1
        (ja_resource) lib/ja_resource/attributes.ex:51: JaResource.Attributes.from_params(%{})
        (ja_resource) lib/ja_resource/create.ex:93: JaResource.Create.call/2
        (ja_resource) lib/ja_resource/plug.ex:61: JaResource.Plug.call/2
        (starlit_server) web/controllers/user_controller.ex:1: StarlitServer.UserController.phoenix_controller_pipeline/2
        (starlit_server) lib/starlit_server/endpoint.ex:1: StarlitServer.Endpoint.instrument/4
        (starlit_server) lib/phoenix/router.ex:261: StarlitServer.Router.dispatch/2
        (starlit_server) web/router.ex:1: StarlitServer.Router.do_call/2
        (starlit_server) lib/starlit_server/endpoint.ex:1: StarlitServer.Endpoint.phoenix_pipeline/1
        (starlit_server) lib/plug/debugger.ex:123: StarlitServer.Endpoint."call (overridable 3)"/2
        (starlit_server) lib/starlit_server/endpoint.ex:1: StarlitServer.Endpoint.call/2
        (plug) lib/plug/adapters/cowboy/handler.ex:15: Plug.Adapters.Cowboy.Handler.upgrade/4
        (cowboy) /Users/akshat.goel/projects/starlit_server/deps/cowboy/src/cowboy_protocol.erl:442: :cowboy_protocol.execute/4

user_controller.ex

defmodule StarlitServer.UserController do
  use StarlitServer.Web, :controller
  use JaResource

  import StarlitServer.Helpers.Query, only: [id_filter: 2, user_filter: 2, limit_filter: 2]

  alias StarlitServer.User
  alias StarlitServer.Services.UserService
  alias StarlitServer.Mailer

  plug :load_and_authorize_resource, model: User, only: [:update]
  plug JaResource
  plug :login, only: [:create]

  def filter(_conn, query, "id", id_list) do
    query |> id_filter(id_list)
  end

  def handle_index(_conn, params) do
    User
    |> user_filter(params)
    |> limit_filter(params)
  end

  def handle_create(_conn, attributes) do
    %User{} |> User.registration_changeset(attributes)
  end

  def handle_update(_conn, record, attributes) do
    with {:ok, user, _, _} <- UserService.update(record, attributes)
    do
      {:ok, user}
    else
      {:error, changeset} -> {:error, changeset}
    end
  end

  def email_available(conn, %{"email" => email}) do
    hash = User.check_email_availability(email)
    conn |> json(hash)
  end

  defp login(conn, _opts) do
    Plug.Conn.register_before_send(conn, &do_login(&1))
  end

  defp do_login(conn), do: Plug.Conn.assign(conn, :current_user, conn.assigns[:data])

  def email_verification(user = %User{} ) do
    if ( user.email != nil ) do
        claims = Guardian.Claims.app_claims
        |> Map.put("email", user.email)
        |> Guardian.Claims.ttl({1, :hours})

        { :ok, jwt, full_claims } = Guardian.encode_and_sign(user, :email_verification, claims)

        Mailer.send_verification_email( user.email, jwt )
    end
  end
end