User form

app/models/domain.rb

@@ -51,7 +51,6 @@ class Domain < ActiveRecord::Base
   validate :validate_domain_statuses_uniqueness, if: :new_record?
 
   attr_accessor :owner_contact_typeahead
-  attr_accessor :registrar_typeahead
 
   def name=(value)
     value.strip!
@@ -64,10 +63,6 @@ class Domain < ActiveRecord::Base
     @owner_contact_typeahead || owner_contact.try(:name) || nil
   end
 
-  def registrar_typeahead
-    @registrar_typeahead || registrar || nil
-  end
-
   def pending_transfer
     domain_transfers.find_by(status: DomainTransfer::PENDING)
   end

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