add migration for user

config/config.exs

@@ -18,6 +18,11 @@ config :rp7pay, Rp7payWeb.Endpoint,
   pubsub_server: Rp7pay.PubSub,
   live_view: [signing_salt: "RcTrGm5N"]
 
+  # Configures repository
+config :rp7pay, Rp7pay.Repo,
+  migration_primary_key: [type: :binary_id],
+  migration_foreign_key: [type: :binary_id]
+
 # Configures Elixir's Logger
 config :logger, :console,
   format: "$time $metadata[$level] $message\n",

lib/rp7pay.ex

@@ -1,9 +1,5 @@
 defmodule Rp7pay do
-  @moduledoc """
-  Rp7pay keeps the contexts that define your domain
-  and business logic.
+  alias Rp7pay.Users.Create, as: UserCreate
 
-  Contexts are also responsible for managing your data, regardless
-  if it comes from the database, an external API or others.
-  """
+  defdelegate create_user(params), to: UserCreate, as: :call
 end

lib/rp7pay/user.ex

@@ -0,0 +1,38 @@
+defmodule Rp7pay.User do
+  use Ecto.Schema
+  import Ecto.Changeset
+
+  alias Ecto.Changeset
+
+  @primary_key {:id, :binary_id, autogenerate: true}
+
+  @required_params [:name, :age, :email, :password, :nickname]
+
+  schema "users" do
+    field :name, :string
+    field :age, :integer
+    field :email, :string
+    field :password, :string, virtual: true
+    field :password_hash, :string
+    field :nickname, :string
+
+    timestamps()
+  end
+
+  def changeset(params) do
+    %__MODULE__{}
+    |> cast(params, @required_params)
+    |> validate_required(@required_params)
+    |> validate_length(:password, min: 6)
+    |> validate_number(:age, greater_than_or_equal_to: 18)
+    |> validate_format(:email, ~r/@/)
+    |> unique_constraint([:email])
+    |> unique_constraint([:nickname])
+    |> put_password_hash
+  end
+
+  defp put_password_hash(%Changeset{valid?: true, changes: %{password: password}} = changeset) do
+    change(changeset, Bcrypt.add_hash(password))
+  end
+  defp put_password_hash(changeset), do: changeset
+end

lib/rp7pay/users/create.ex

@@ -0,0 +1,9 @@
+defmodule Rp7pay.Users.Create do
+  alias Rp7pay.{Repo, User}
+
+  def call(params) do
+    params
+    |> User.changeset
+    |> Repo.insert
+  end
+end

lib/rp7pay_web/controllers/users_controller.ex

@@ -0,0 +1,23 @@
+defmodule Rp7payWeb.UsersController do
+  use Rp7payWeb, :controller
+
+  alias Rp7pay.User
+
+  def create(conn, params) do
+    params
+    |> Rp7pay.create_user
+    |> handle_response(conn)
+  end
+
+  defp handle_response({:ok, %User{} = user}, conn) do
+    conn
+    |> put_status(:created)
+    |> render("create.json", user: user)
+  end
+  defp handle_response({:error, result}, conn) do
+    conn
+    |> put_status(:bad_request)
+    |> put_view(Rp7payWeb.ErrorView)
+    |> render("400.json", result: result)
+  end
+end

lib/rp7pay_web/router.ex

@@ -9,6 +9,8 @@ defmodule Rp7payWeb.Router do
     pipe_through :api
 
     get "/:filename", WelcomeController, :index
+
+    post "/users", UsersController, :create
   end
 
   # Enables LiveDashboard only for development

lib/rp7pay_web/views/users_view.ex

@@ -0,0 +1,14 @@
+defmodule Rp7payWeb.UsersView do
+  alias Rp7pay.User
+
+  def render("create.json", %{user: %User{id: id, name: name, nickname: nickname}}) do
+    %{
+      message: "User created",
+      user: %{
+        id: id,
+        name: name,
+        nickname: nickname
+      }
+    }
+  end
+end

mix.exs

@@ -43,7 +43,8 @@ defmodule Rp7pay.MixProject do
       {:gettext, "~> 0.11"},
       {:jason, "~> 1.0"},
       {:plug_cowboy, "~> 2.0"},
-      {:credo, "~> 1.5", only: [:dev, :test], runtime: false}
+      {:credo, "~> 1.5", only: [:dev, :test], runtime: false},
+      {:bcrypt_elixir, "~> 2.0"}
     ]
   end
 

priv/repo/migrations/20210223225727_create_user_table.exs

@@ -0,0 +1,18 @@
+defmodule Rp7pay.Repo.Migrations.CreateUserTable do
+  use Ecto.Migration
+
+  def change do
+    create table :users do
+      add :name, :string
+      add :age, :integer
+      add :email, :string
+      add :password_hash, :string
+      add :nickname, :string
+
+      timestamps()
+    end
+
+    create unique_index(:users, [:email])
+    create unique_index(:users, [:nickname])
+  end
+end