diff --git a/app/models/online_notification.rb b/app/models/online_notification.rb
index 2ea27228c..3e70056ff 100644
--- a/app/models/online_notification.rb
+++ b/app/models/online_notification.rb
@@ -100,15 +100,11 @@ return all online notifications of an user
 
   notifications = OnlineNotification.list(user, limit)
 
-or with expand data
-
-  notifications = OnlineNotification.list(user, limit, expand)
-
 =end
 
   def self.list(user, limit)
     OnlineNotification.where(user_id: user.id)
-                      .order('created_at DESC, id DESC')
+                      .order(created_at: :desc)
                       .limit(limit)
   end
 
@@ -256,26 +252,4 @@ with dedicated times
 
     true
   end
-
-  # streamline structur
-  def attributes_with_association_names
-    attributes = super
-    map = {
-      'object_lookup'    => 'object',
-      'object_lookup_id' => 'object_id',
-      'type_lookup'      => 'type',
-      'type_lookup_id'   => 'type_id',
-    }
-    map.each do |key, value|
-      next if !attributes.key?(key)
-
-      attributes[value] = attributes[key]
-      attributes.delete(key)
-    end
-
-    attributes['object'] = ObjectLookup.by_id(attributes['object_id']) if attributes['object_id'].present?
-    attributes['type']   = TypeLookup.by_id(attributes['type_id']) if attributes['type_id'].present?
-
-    attributes
-  end
 end
diff --git a/spec/requests/online_notifications_controller_spec.rb b/spec/requests/online_notifications_controller_spec.rb
index c93ede890..af601d7e9 100644
--- a/spec/requests/online_notifications_controller_spec.rb
+++ b/spec/requests/online_notifications_controller_spec.rb
@@ -6,6 +6,7 @@ RSpec.describe OnlineNotification, type: :request do
 
   let(:admin) { create(:admin, groups: Group.all) }
   let(:agent) { create(:agent, groups: Group.all) }
+  let(:user_id) { user.id }
 
   let(:type_lookup_id) { TypeLookup.by_name('create') }
   let(:object_lookup_id) { ObjectLookup.by_name('User') }
@@ -36,7 +37,7 @@ RSpec.describe OnlineNotification, type: :request do
       end
     end
 
-    shared_examples 'for notification id' do
+    shared_examples 'for notification id in array' do
       it 'has a notification id' do
         get path, params: {}, as: :json
 
@@ -44,11 +45,59 @@ RSpec.describe OnlineNotification, type: :request do
       end
     end
 
-    shared_examples 'for object attribute' do
-      it 'has a object attribute' do
+    shared_examples 'for notification id in hash' do
+      it 'has a notification id' do
         get path, params: {}, as: :json
 
-        expect(json_response[0]['object']).to be_a_kind_of(String)
+        expect(json_response['id']).to be online_notification.id
+      end
+    end
+
+    shared_examples 'for user id in array' do
+      it 'has a user id' do
+        get path, params: {}, as: :json
+
+        expect(json_response[0]['user_id']).to eq(user_id)
+      end
+    end
+
+    shared_examples 'for user id in hash' do
+      it 'has a user id' do
+        get path, params: {}, as: :json
+
+        expect(json_response['user_id']).to eq(user_id)
+      end
+    end
+
+    shared_examples 'for object lookup id in array' do
+      it 'has a object lookup id' do
+        get path, params: {}, as: :json
+
+        expect(json_response[0]['object_lookup_id']).to eq(object_lookup_id)
+      end
+    end
+
+    shared_examples 'for object lookup id in hash' do
+      it 'has a object lookup' do
+        get path, params: {}, as: :json
+
+        expect(json_response['object_lookup_id']).to eq(object_lookup_id)
+      end
+    end
+
+    shared_examples 'for type lookup id in array' do
+      it 'has a type lookup id' do
+        get path, params: {}, as: :json
+
+        expect(json_response[0]['type_lookup_id']).to eq(type_lookup_id)
+      end
+    end
+
+    shared_examples 'for type lookup id in hash' do
+      it 'has a type lookup' do
+        get path, params: {}, as: :json
+
+        expect(json_response['type_lookup_id']).to eq(type_lookup_id)
       end
     end
 
@@ -67,21 +116,12 @@ RSpec.describe OnlineNotification, type: :request do
       context 'when online notifications is requested' do
         let(:path) { '/api/v1/online_notifications' }
 
-        it 'has an object lookup id' do
-          get path, params: {}, as: :json
-
-          expect(json_response[0]['object_lookup_id']).to be_a_kind_of(Integer)
-        end
-
-        it 'has a type lookup id' do
-          get path, params: {}, as: :json
-
-          expect(json_response[0]['type_lookup_id']).to be_a_kind_of(Integer)
-        end
-
         include_examples 'for successful request'
         include_examples 'for array response'
-        include_examples 'for notification id'
+        include_examples 'for notification id in array'
+        include_examples 'for user id in array'
+        include_examples 'for object lookup id in array'
+        include_examples 'for type lookup id in array'
       end
 
       context 'when online notifications is requested with full params' do
@@ -106,14 +146,21 @@ RSpec.describe OnlineNotification, type: :request do
         it 'has a type attribute' do
           get path, params: {}, as: :json
 
-          expect(json_response[0]['type']).to be_a_kind_of(String)
+          expect(json_response[0]['type']).to eq('create')
+        end
+
+        it 'has a object attribute' do
+          get path, params: {}, as: :json
+
+          expect(json_response[0]['object']).to eq('User')
         end
 
         include_examples 'for successful request'
         include_examples 'for array response'
-        include_examples 'for object attribute'
-        include_examples 'for notification id'
-
+        include_examples 'for notification id in array'
+        include_examples 'for user id in array'
+        include_examples 'for object lookup id in array'
+        include_examples 'for type lookup id in array'
       end
     end
 
@@ -123,26 +170,12 @@ RSpec.describe OnlineNotification, type: :request do
       context 'when specific online notifications is requested' do
         let(:path) { "/api/v1/online_notifications/#{online_notification.id}" }
 
-        it 'has a notification id' do
-          get path, params: {}, as: :json
-
-          expect(json_response['id']).to be online_notification.id
-        end
-
-        it 'has a type lookup id' do
-          get path, params: {}, as: :json
-
-          expect(json_response['type_lookup_id']).to be_a_kind_of(Integer)
-        end
-
-        it 'has an object lookup id' do
-          get path, params: {}, as: :json
-
-          expect(json_response['object_lookup_id']).to be_a_kind_of(Integer)
-        end
-
         include_examples 'for successful request'
         include_examples 'for hash response'
+        include_examples 'for notification id in hash'
+        include_examples 'for user id in hash'
+        include_examples 'for object lookup id in hash'
+        include_examples 'for type lookup id in hash'
       end
 
       context 'when specific online notifications is requested with full params' do
@@ -165,23 +198,21 @@ RSpec.describe OnlineNotification, type: :request do
         it 'has a type attribute' do
           get path, params: {}, as: :json
 
-          expect(json_response['type']).to be_a_kind_of(String)
+          expect(json_response['type']).to eq('create')
         end
 
         it 'has a object attribute' do
           get path, params: {}, as: :json
 
-          expect(json_response['object']).to be_a_kind_of(String)
-        end
-
-        it 'has a notification id' do
-          get path, params: {}, as: :json
-
-          expect(json_response['id']).to be online_notification.id
+          expect(json_response['object']).to eq('User')
         end
 
         include_examples 'for successful request'
         include_examples 'for hash response'
+        include_examples 'for notification id in hash'
+        include_examples 'for user id in hash'
+        include_examples 'for object lookup id in hash'
+        include_examples 'for type lookup id in hash'
       end
 
     end
@@ -212,7 +243,7 @@ RSpec.describe OnlineNotification, type: :request do
       let(:user) { create(:admin, groups: Group.all) }
 
       let(:online_notification) do
-        create(:online_notification, o_id: admin.id, user_id: user.id, type_lookup_id: type_lookup_id, object_lookup_id: object_lookup_id)
+        create(:online_notification, o_id: admin.id, user_id: user_id, type_lookup_id: type_lookup_id, object_lookup_id: object_lookup_id)
       end
 
       let(:different_online_notification) do
@@ -230,7 +261,7 @@ RSpec.describe OnlineNotification, type: :request do
       let(:user) { create(:agent, groups: Group.all) }
 
       let(:online_notification) do
-        create(:online_notification, o_id: admin.id, user_id: user.id, type_lookup_id: type_lookup_id, object_lookup_id: object_lookup_id)
+        create(:online_notification, o_id: admin.id, user_id: user_id, type_lookup_id: type_lookup_id, object_lookup_id: object_lookup_id)
       end
 
       let(:different_online_notification) do
@@ -248,7 +279,7 @@ RSpec.describe OnlineNotification, type: :request do
       let(:user) { create(:customer) }
 
       let(:online_notification) do
-        create(:online_notification, o_id: user.id, user_id: user.id, type_lookup_id: type_lookup_id, object_lookup_id: object_lookup_id)
+        create(:online_notification, o_id: user_id, user_id: user_id, type_lookup_id: type_lookup_id, object_lookup_id: object_lookup_id)
       end
 
       let(:different_online_notification) do