Declare callbacks explicitly

app/models/relation_member.rb

@@ -2,23 +2,26 @@ class RelationMember < ActiveRecord::Base
   set_table_name 'current_relation_members'
   
   set_primary_keys :id, :sequence_id
+
   belongs_to :member, :polymorphic => true
   belongs_to :relation, :foreign_key => :id
 
-  def after_find
-    self[:member_class] = self.member_type.classify
-  end
-
-  def after_initialize
-    self[:member_class] = self.member_type.classify unless self.member_type.nil?
-  end
-
-  def before_save
-    self.member_type = self[:member_class].classify
-  end
+  after_find :set_class_from_type
+  after_initialize :set_class_from_type
+  before_save :set_type_from_class
 
   def member_type=(type)
     self[:member_type] = type
     self[:member_class] = type.capitalize
   end
+
+private
+
+  def set_class_from_type
+    self[:member_class] = self.member_type.classify unless self.member_type.nil?
+  end
+
+  def set_type_from_class
+    self.member_type = self[:member_class].classify
+  end
 end