From d578bc6cf317c21c11a3129b7c9a9f056b6c1e0b Mon Sep 17 00:00:00 2001
From: Joao P Dubas <joao.dubas@gmail.com>
Date: Tue, 22 Jun 2021 23:56:07 +0000
Subject: [PATCH] [day-02] validate user input

Also improve migration to reflect requirements in validation done
through `Ecto.Changeset`.
---
 lib/wabanex/user.ex                                | 14 ++++++++++++++
 .../20210622015725_create_users_table.exs          |  6 +++---
 2 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/lib/wabanex/user.ex b/lib/wabanex/user.ex
index 2403553..562c2b1 100644
--- a/lib/wabanex/user.ex
+++ b/lib/wabanex/user.ex
@@ -1,8 +1,12 @@
 defmodule Wabanex.User do
   use Ecto.Schema
 
+  import Ecto.Changeset
+
   @primary_key {:id, :binary_id, autogenerate: true}
 
+  @fields ~w(name email password)a
+
   schema "users" do
     field :name, :string
     field :email, :string
@@ -10,4 +14,14 @@ defmodule Wabanex.User do
 
     timestamps()
   end
+
+  def changeset(params) do
+    %__MODULE__{}
+    |> cast(params, @fields)
+    |> validate_required(@fields)
+    |> validate_length(:name, min: 2)
+    |> validate_length(:password, min: 6)
+    |> validate_format(:email, ~r/@/)
+    |> unique_constraint([:email])
+  end
 end
diff --git a/priv/repo/migrations/20210622015725_create_users_table.exs b/priv/repo/migrations/20210622015725_create_users_table.exs
index 4e0745a..f740879 100644
--- a/priv/repo/migrations/20210622015725_create_users_table.exs
+++ b/priv/repo/migrations/20210622015725_create_users_table.exs
@@ -3,9 +3,9 @@ defmodule Wabanex.Repo.Migrations.CreateUsersTable do
 
   def change do
     create table(:users) do
-      add :email, :string
-      add :name, :string
-      add :password, :string
+      add :email, :string, null: false
+      add :name, :string, null: false
+      add :password, :string, null: false
 
       timestamps()
     end