lasseebert

defmodule MyApp.UserController do
  use MyApp.Web, :controller

  def create(conn, params) do
    attrs = %{email: params["email"]}
    {:ok, user} = MyApp.Users.Invite.call(attrs)

    {:ok, body} = %{
      id: user.id,
      email: user.email

lasseebert

$ mix test
Compiling 1 file (.ex)
warning: variable user is unused
  web/controllers/user_controller.ex:6

....

  1) test inviting a user responds with the new user (MyApp.UserController.InviteTest)
     test/controllers/user_controller/invite_test.exs:4
     Expected truthy, got false

lasseebert

$ mix test              
...

  1) test inviting a user responds with the new user (MyApp.UserController.InviteTest)
     test/controllers/user_controller/invite_test.exs:4
     ** (FunctionClauseError) no function clause matching in MyApp.Users.Invite.call/1
     stacktrace:
       (my_app) lib/my_app/contexts/users/invite.ex:8: MyApp.Users.Invite.call(%{"email" => "alice@example.com"})
       (my_app) web/controllers/user_controller.ex:5: MyApp.UserController.create/2
       (my_app) web/controllers/user_controller.ex:1: MyApp.UserController.action/2

lasseebert

$ mix test test/contexts                           
.

Finished in 0.05 seconds
1 test, 0 failures

Randomized with seed 163288

lasseebert

defmodule MyApp.Repo.Migrations.AddUsersTable do
  use Ecto.Migration

  def change do
    create table(:users) do
      add :email, :string

      timestamps
    end

lasseebert

$ mix test test/contexts     


  1) test it creates a user (MyApp.Users.InviteTest)
     test/contexts/users/invite_test.exs:7
     ** (Postgrex.Error) ERROR (undefined_table): relation "users" does not exist
     stacktrace:
       (ecto) lib/ecto/adapters/sql.ex:463: Ecto.Adapters.SQL.struct/6
       (ecto) lib/ecto/repo/schema.ex:397: Ecto.Repo.Schema.apply/4
       (ecto) lib/ecto/repo/schema.ex:193: anonymous fn/11 in Ecto.Repo.Schema.do_insert/4

lasseebert

$ mix test test/contexts     


  1) test it creates a user (MyApp.Users.InviteTest)
     test/contexts/users/invite_test.exs:7
     ** (Postgrex.Error) ERROR (undefined_table): relation "users" does not exist
     stacktrace:
       (ecto) lib/ecto/adapters/sql.ex:463: Ecto.Adapters.SQL.struct/6
       (ecto) lib/ecto/repo/schema.ex:397: Ecto.Repo.Schema.apply/4
       (ecto) lib/ecto/repo/schema.ex:193: anonymous fn/11 in Ecto.Repo.Schema.do_insert/4

lasseebert

defmodule MyApp.User do
  use MyApp.Web, :model

  schema "users" do
    field :email, :string

    timestamps
  end
end

lasseebert

$ mix test test/contexts
Compiling 1 file (.ex)

== Compilation error on file lib/my_app/contexts/users/invite.ex ==
** (CompileError) lib/my_app/contexts/users/invite.ex:17: MyApp.User.__struct__/1 is undefined, cannot expand struct MyApp.User
    (stdlib) lists.erl:1354: :lists.mapfoldl/3
    (stdlib) lists.erl:1354: :lists.mapfoldl/3

lasseebert

defmodule MyApp.Users.Invite do

  alias MyApp.User
  alias MyApp.Repo

  @create_params [:email]

  def call(%{email: email}) do
    email
    |> build_changeset