diff --git a/lib/api/entities.rb b/lib/api/entities.rb
index 45d0b28..eea067e 100644
--- a/lib/api/entities.rb
+++ b/lib/api/entities.rb
@@ -2,6 +2,7 @@ module API
   module Entities
 
     class Image < Grape::Entity
+      root 'images', 'image'
 
       expose  :icon_url do |image, options|
         image.public_filename(:icon)
@@ -28,10 +29,12 @@ module API
     class Person < Profile;end;
     class Enterprise < Profile;end;
     class Community < Profile
+      root 'communities', 'community'
       expose :description
     end
 
     class Category < Grape::Entity
+      root 'categories', 'category'
       expose :name, :id, :slug
       expose :image, :using => Image
     end
@@ -44,12 +47,6 @@ module API
       expose :author, :using => Profile
       expose :profile, :using => Profile
       expose :categories, :using => Category
-#, :if => lambda { |instance, options| raise params.inspect }
-# do |instance, options|
-#    # examine available environment keys with `p options[:env].keys`
-#    options[:user]
-#  end
-
     end
 
     class Comment < Grape::Entity
diff --git a/lib/api/helpers.rb b/lib/api/helpers.rb
index 845e386..e92aebf 100644
--- a/lib/api/helpers.rb
+++ b/lib/api/helpers.rb
@@ -163,6 +163,9 @@ module API
       error!({'message' => message, :code => status}, status)
     end
 
+    def render_api_errors!(messages)
+      render_api_error!(messages.join(','), 400)
+    end
     protected
 
     def detect_stuff_by_domain
diff --git a/lib/api/v1/articles.rb b/lib/api/v1/articles.rb
index 50d592b..b114d0b 100644
--- a/lib/api/v1/articles.rb
+++ b/lib/api/v1/articles.rb
@@ -66,7 +66,9 @@ module API
               community = environment.communities.find(params[:community_id])
               article = community.articles.build(params[:article].merge(:last_changed_by => current_person))
               article.type= params[:type].nil? ? 'TinyMceArticle' : params[:type]
-              article.save
+              if !article.save
+                render_api_errors!(article.errors.full_messages)
+              end
               present article, :with => Entities::Article
             end
 
diff --git a/lib/api/v1/communities.rb b/lib/api/v1/communities.rb
index 1f51ffb..1332397 100644
--- a/lib/api/v1/communities.rb
+++ b/lib/api/v1/communities.rb
@@ -16,27 +16,24 @@ module API
         # Example Request:
         #  GET /communities?from=2013-04-04-14:41:43&until=2014-04-04-14:41:43&limit=10
         #  GET /communities?reference_id=10&limit=10&oldest
-#    desc 'Articles.', {
-#      :params => API::Entities::Article.documentation
-#    }
         get do
-          conditions = make_conditions_with_parameter(params)
-                  
-          if params[:reference_id]
-            communities = environment.communities.send("#{params.key?(:oldest) ? 'older_than' : 'newer_than'}", params[:reference_id]).find(:all, :conditions => conditions, :limit => limit, :order => "created_at DESC")
-          else
-            communities = environment.communities.find(:all, :conditions => conditions, :limit => limit, :order => "created_at DESC")
-          end
+          communities = select_filtered_collection_of(current_person, 'communities', params)
           present communities, :with => Entities::Community
         end
-  
-        desc "Return the article id" 
+
+        #FIXME See only public communities
+        get '/all' do
+          communities = select_filtered_collection_of(environment, 'communities', params)
+          present communities, :with => Entities::Community
+        end
+
         get ':id' do
-          present environment.communities.find(params[:id]), :with => Entities::Community
+          community = environment.communities.find(params[:id])
+          present community, :with => Entities::Community
         end
 
       end
-   
+
     end
   end
 end
diff --git a/lib/api/v1/enterprises.rb b/lib/api/v1/enterprises.rb
index fc8615e..6116f8c 100644
--- a/lib/api/v1/enterprises.rb
+++ b/lib/api/v1/enterprises.rb
@@ -16,17 +16,8 @@ module API
         # Example Request:
         #  GET /enterprises?from=2013-04-04-14:41:43&until=2014-04-04-14:41:43&limit=10
         #  GET /enterprises?reference_id=10&limit=10&oldest
-#    desc 'Articles.', {
-#      :params => API::Entities::Article.documentation
-#    }
         get do
-          conditions = make_conditions_with_parameter(params)
-                  
-          if params[:reference_id]
-            enterprises = environment.enterprises.send("#{params.key?(:oldest) ? 'older_than' : 'newer_than'}", params[:reference_id]).find(:all, :conditions => conditions, :limit => limit, :order => "created_at DESC")
-          else
-            enterprises = environment.enterprises.find(:all, :conditions => conditions, :limit => limit, :order => "created_at DESC")
-          end
+          enterprises = select_filtered_collection_of(environment, 'enterprises', params)
           present enterprises, :with => Entities::Enterprise
         end
   
diff --git a/lib/api/v1/people.rb b/lib/api/v1/people.rb
index b6e6837..fd10dca 100644
--- a/lib/api/v1/people.rb
+++ b/lib/api/v1/people.rb
@@ -16,48 +16,14 @@ module API
         # Example Request:
         #  GET /people?from=2013-04-04-14:41:43&until=2014-04-04-14:41:43&limit=10
         #  GET /people?reference_id=10&limit=10&oldest
-#    desc 'Articles.', {
-#      :params => API::Entities::Article.documentation
-#    }
         get do
-          conditions = make_conditions_with_parameter(params)
-                  
-          if params[:reference_id]
-            people = environment.people.send("#{params.key?(:oldest) ? 'older_than' : 'newer_than'}", params[:reference_id]).find(:all, :conditions => conditions, :limit => limit, :order => "created_at DESC")
-          else
-            people = environment.people.find(:all, :conditions => conditions, :limit => limit, :order => "created_at DESC")
-          end
+          people = select_filtered_collection_of(environment, 'people', params)
           present people, :with => Entities::Person
         end
-    
 
-        segment '/:person_id' do  
- 
-          desc "Return the person information" 
-          get do
-            present environment.people.find(params[:person_id]), :with => Entities::Person
-          end
-  
-          resource '/communities' do 
-            desc "Return all communities of person" 
-            get  do
-              person = environment.people.find(params[:person_id])
-              conditions = make_conditions_with_parameter(params)
-                      
-              if params[:reference_id]
-                communities = person.communities.send("#{params.key?(:oldest) ? 'older_than' : 'newer_than'}", params[:reference_id]).find(:all, :conditions => conditions, :limit => limit, :order => "created_at DESC")
-              else
-                communities = person.communities.find(:all, :conditions => conditions, :limit => limit, :order => "created_at DESC")
-              end
-              present communities, :with => Entities::Community
-            end
-
-            desc "Return all communities of person" 
-            get '/:id' do
-              person = environment.people.find(params[:person_id])
-              present person.communities.find(params[:id]), :with => Entities::Community
-            end
-          end
+        desc "Return the person information" 
+        get '/:id' do
+          present environment.people.find(params[:id]), :with => Entities::Person
         end
 
       end
--
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