remove Role entity and set language to pt-BR

app/models/user.rb

@@ -10,6 +10,7 @@
 #  remember_created_at    :datetime
 #  reset_password_sent_at :datetime
 #  reset_password_token   :string
+#  roles                  :string           default([]), is an Array
 #  created_at             :datetime         not null
 #  updated_at             :datetime         not null
 #
@@ -19,21 +20,31 @@
 #  index_users_on_reset_password_token  (reset_password_token) UNIQUE
 #
 class User < ApplicationRecord
+  extend Enumerize
+
   devise :database_authenticatable,
-         :registerable,
          :recoverable,
          :rememberable,
          :validatable,
          :omniauthable,
          omniauth_providers: [:google_oauth2]
 
-  has_and_belongs_to_many :roles
+  enumerize :roles,
+            multiple: true,
+            default: :teacher,
+            in: %i[admin nde coordinator center_director pro_rector teacher]
 
   validates :name, presence: true
 
+  roles.values.each do |role|
+    define_method "#{role}?" do
+      roles.include?(role)
+    end
+  end
+
   def self.from_omniauth(email, avatar_url)
-    @user = User.find_by!(email: email)
-    @user.update(avatar_url: avatar_url)
-    @user
+    User.find_by(email: email).tap do |user|
+      user.update(avatar_url: avatar_url) unless user.nil?
+    end
   end
 end