User form

app/models/user.rb

@@ -8,4 +8,32 @@ class User < ActiveRecord::Base
 
   belongs_to :role
   belongs_to :registrar
+
+  validates :username, :password, presence: true
+  validates :identity_code, uniqueness: true, allow_blank: true
+  validate :registrar_presence
+
+  before_save :manage_registrar
+
+  attr_accessor :registrar_typeahead
+
+  def to_s
+    username
+  end
+
+  def registrar_typeahead
+    @registrar_typeahead || registrar || nil
+  end
+
+  private
+
+  def registrar_presence
+    if !admin && !registrar
+      errors.add(:registrar, :blank)
+    end
+  end
+
+  def manage_registrar
+    self.registrar = nil if admin?
+  end
 end