diff --git a/lib/rolify/adapters/active_record/role_adapter.rb b/lib/rolify/adapters/active_record/role_adapter.rb
index a1f01fb3..938bb27c 100644
--- a/lib/rolify/adapters/active_record/role_adapter.rb
+++ b/lib/rolify/adapters/active_record/role_adapter.rb
@@ -12,9 +12,9 @@ def where_strict(relation, args)
         wrap_conditions = relation.name != role_class.name
 
         conditions = if args[:resource].is_a?(Class)
-                       {:resource_type => args[:resource].to_s, :resource_id => nil }
+                       {:resource_type => args[:resource].polymorphic_name, :resource_id => nil }
                      elsif args[:resource].present?
-                       {:resource_type => args[:resource].class.name, :resource_id => args[:resource].id}
+                       {:resource_type => args[:resource].class.polymorphic_name, :resource_id => args[:resource].id}
                      else
                        {}
                      end
@@ -27,7 +27,7 @@ def where_strict(relation, args)
 
       def find_cached(relation, args)
         resource_id = (args[:resource].nil? || args[:resource].is_a?(Class) || args[:resource] == :any) ? nil : args[:resource].id
-        resource_type = args[:resource].is_a?(Class) ? args[:resource].to_s : args[:resource].class.name
+        resource_type = (args[:resource].is_a?(Class) ? args[:resource] : args[:resource].class).polymorphic_name
 
         return relation.find_all { |role| role.name == args[:name].to_s } if args[:resource] == :any
 
@@ -40,7 +40,7 @@ def find_cached(relation, args)
 
       def find_cached_strict(relation, args)
         resource_id = (args[:resource].nil? || args[:resource].is_a?(Class)) ? nil : args[:resource].id
-        resource_type = args[:resource].is_a?(Class) ? args[:resource].to_s : args[:resource].class.name
+        resource_type = (args[:resource].is_a?(Class) ? args[:resource] : args[:resource].class).polymorphic_name
 
         relation.find_all do |role|
           role.resource_id == resource_id && role.resource_type == resource_type && role.name == args[:name].to_s
@@ -57,7 +57,7 @@ def add(relation, role)
 
       def remove(relation, role_name, resource = nil)
         cond = { :name => role_name }
-        cond[:resource_type] = (resource.is_a?(Class) ? resource.to_s : resource.class.name) if resource
+        cond[:resource_type] = (resource.is_a?(Class) ? resource : resource.class).polymorphic_name if resource
         cond[:resource_id] = resource.id if resource && !resource.is_a?(Class)
         roles = relation.roles.where(cond)
         if roles
@@ -110,10 +110,10 @@ def build_query(role, resource = nil)
         if resource
           query.insert(0, "(")
           query += " OR ((#{role_table}.name = ?) AND (#{role_table}.resource_type = ?) AND (#{role_table}.resource_id IS NULL))"
-          values << role << (resource.is_a?(Class) ? resource.to_s : resource.class.name)
+          values << role << (resource.is_a?(Class) ? resource : resource.class).polymorphic_name
           if !resource.is_a? Class
             query += " OR ((#{role_table}.name = ?) AND (#{role_table}.resource_type = ?) AND (#{role_table}.resource_id = ?))"
-            values << role << resource.class.name << resource.id
+            values << role << resource.class.polymorphic_name << resource.id
           end
           query += ")"
         end
diff --git a/lib/rolify/adapters/mongoid/role_adapter.rb b/lib/rolify/adapters/mongoid/role_adapter.rb
index a3fb0486..6d7c5993 100644
--- a/lib/rolify/adapters/mongoid/role_adapter.rb
+++ b/lib/rolify/adapters/mongoid/role_adapter.rb
@@ -12,9 +12,9 @@ def where_strict(relation, args)
         wrap_conditions = relation.name != role_class.name
 
         conditions = if args[:resource].is_a?(Class)
-                       {:resource_type => args[:resource].to_s, :resource_id => nil }
+                       {:resource_type => args[:resource].polymorphic_name, :resource_id => nil }
                      elsif args[:resource].present?
-                       {:resource_type => args[:resource].class.name, :resource_id => args[:resource].id}
+                       {:resource_type => args[:resource].class.polymorphic_name, :resource_id => args[:resource].id}
                      else
                        {}
                      end
@@ -27,7 +27,7 @@ def where_strict(relation, args)
 
       def find_cached(relation, args)
         resource_id = (args[:resource].nil? || args[:resource].is_a?(Class) || args[:resource] == :any) ? nil : args[:resource].id
-        resource_type = args[:resource].is_a?(Class) ? args[:resource].to_s : args[:resource].class.name
+        resource_type = (args[:resource].is_a?(Class) ? args[:resource] : args[:resource].class).polymorphic_name
 
         return relation.find_all { |role| role.name == args[:name].to_s } if args[:resource] == :any
 
@@ -40,7 +40,7 @@ def find_cached(relation, args)
 
       def find_cached_strict(relation, args)
         resource_id = (args[:resource].nil? || args[:resource].is_a?(Class)) ? nil : args[:resource].id
-        resource_type = args[:resource].is_a?(Class) ? args[:resource].to_s : args[:resource].class.name
+        resource_type = (args[:resource].is_a?(Class) ? args[:resource] : args[:resource].class).polymorphic_name
 
         relation.find_all do |role|
           role.resource_id == resource_id && role.resource_type == resource_type && role.name == args[:name].to_s
@@ -73,7 +73,7 @@ def remove(relation, role_name, resource = nil)
         #  role.destroy if role.send(user_class.to_s.tableize.to_sym).empty?
         #end
         cond = { :name => role_name }
-        cond[:resource_type] = (resource.is_a?(Class) ? resource.to_s : resource.class.name) if resource
+        cond[:resource_type] = (resource.is_a?(Class) ? resource : resource.class).polymorphic_name if resource
         cond[:resource_id] = resource.id if resource && !resource.is_a?(Class)
         roles = relation.roles.where(cond)
         roles.each do |role|
@@ -123,9 +123,9 @@ def build_query(role, resource = nil)
         return [{ :name => role }] if resource == :any
         query = [{ :name => role, :resource_type => nil, :resource_id => nil }]
         if resource
-          query << { :name => role, :resource_type => (resource.is_a?(Class) ? resource.to_s : resource.class.name), :resource_id => nil }
+          query << { :name => role, :resource_type => (resource.is_a?(Class) ? resource : resource.class).polymorphic_name, :resource_id => nil }
           if !resource.is_a? Class
-            query << { :name => role, :resource_type => resource.class.name, :resource_id => resource.id }
+            query << { :name => role, :resource_type => resource.class.polymorphic_name, :resource_id => resource.id }
           end
         end
         query
diff --git a/lib/rolify/role.rb b/lib/rolify/role.rb
index 34f6f13a..2ad5dbae 100644
--- a/lib/rolify/role.rb
+++ b/lib/rolify/role.rb
@@ -11,7 +11,7 @@ def self.included(base)
 
     def add_role(role_name, resource = nil)
       role = self.class.adapter.find_or_create_by(role_name.to_s,
-                                                  (resource.is_a?(Class) ? resource.to_s : resource.class.name if resource),
+                                                  ((resource.is_a?(Class) ? resource : resource.class).polymorphic_name if resource),
                                                   (resource.id if resource && !resource.is_a?(Class)))
 
       if !roles.include?(role)