diff --git a/lib/noosfero/api/entities.rb b/lib/noosfero/api/entities.rb
index af6e5f9..b1564a1 100644
--- a/lib/noosfero/api/entities.rb
+++ b/lib/noosfero/api/entities.rb
@@ -64,6 +64,7 @@ module Noosfero
         expose :profile, :using => Profile
         expose :categories, :using => Category
         expose :image, :using => Image
+        #TODO Apply vote stuff in core and make this test
         expose :votes_for
         expose :votes_against
         expose :setting
diff --git a/lib/noosfero/api/helpers.rb b/lib/noosfero/api/helpers.rb
index 14ab098..489ff1c 100644
--- a/lib/noosfero/api/helpers.rb
+++ b/lib/noosfero/api/helpers.rb
@@ -2,10 +2,10 @@ module Noosfero
   module API
     module APIHelpers
       PRIVATE_TOKEN_PARAM = :private_token
-      ALLOWED_PARAMETERS = ['parent_id', 'from', 'until', 'content_type'] 
+      ALLOWED_PARAMETERS = [:parent_id, :from, :until, :content_type] 
 
       def current_user
-        private_token = (params[PRIVATE_TOKEN_PARAM] || headers['Private-Token'] || cookies['_noosfero_api_session']).to_s if params
+        private_token = (params[PRIVATE_TOKEN_PARAM] || headers['Private-Token']).to_s
         @current_user ||= User.find_by_private_token(private_token)
         @current_user = nil if !@current_user.nil? && @current_user.private_token_expired?
         @current_user
@@ -53,10 +53,10 @@ module Noosfero
       def make_conditions_with_parameter(params = {})
         parsed_params = parser_params(params)
         conditions = {}
-        from_date = DateTime.parse(parsed_params.delete('from')) if parsed_params['from']
-        until_date = DateTime.parse(parsed_params.delete('until')) if parsed_params['until']
+        from_date = DateTime.parse(parsed_params.delete(:from)) if parsed_params[:from]
+        until_date = DateTime.parse(parsed_params.delete(:until)) if parsed_params[:until]
   
-        conditions[:type] = parse_content_type(parsed_params.delete('content_type')) unless parsed_params['content_type'].nil?
+        conditions[:type] = parse_content_type(parsed_params.delete(:content_type)) unless parsed_params[:content_type].nil?
   
         conditions[:created_at] = period(from_date, until_date) if from_date || until_date
         conditions.merge!(parsed_params)
@@ -167,7 +167,11 @@ module Noosfero
       private
 
       def parser_params(params) 
-        params.select{|k,v| ALLOWED_PARAMETERS.include?(k)}
+        parsed_params = {}
+        params.map do |k,v| 
+          parsed_params[k.to_sym] = v if ALLOWED_PARAMETERS.include?(k.to_sym)
+        end
+        parsed_params 
       end
   
       def default_limit
diff --git a/lib/noosfero/api/v1/articles.rb b/lib/noosfero/api/v1/articles.rb
index 0e20aa4..157155e 100644
--- a/lib/noosfero/api/v1/articles.rb
+++ b/lib/noosfero/api/v1/articles.rb
@@ -32,10 +32,13 @@ module Noosfero
           get ':id/children' do
             article = find_article(environment.articles, params[:id])
 
+            #TODO make tests for this situation
             votes_order = params.delete(:order) if params[:order]=='votes_score'
             articles = select_filtered_collection_of(article, 'children', params)
             articles = articles.display_filter(current_person, nil)
 
+            
+            #TODO make tests for this situation
             if votes_order
               articles = articles.joins('left join votes on articles.id=votes.voteable_id').group('articles.id').reorder('sum(coalesce(votes.vote, 0)) DESC')
             end
diff --git a/test/unit/api/helpers_test.rb b/test/unit/api/helpers_test.rb
index 945fa02..676bf96 100644
--- a/test/unit/api/helpers_test.rb
+++ b/test/unit/api/helpers_test.rb
@@ -1,7 +1,7 @@
 require File.dirname(__FILE__) + '/test_helper'
 require File.expand_path(File.dirname(__FILE__) + "/../../../lib/noosfero/api/helpers")
 
-class APITest < ActiveSupport::TestCase
+class APIHelpersTest < ActiveSupport::TestCase
 
   include Noosfero::API::APIHelpers
 
@@ -126,11 +126,18 @@ class APITest < ActiveSupport::TestCase
     assert_not_nil make_conditions_with_parameter(:from => '2010-10-10')[:created_at]
   end
 
+  should 'make_conditions_with_parameter return created_at parameter if from period is defined as string' do
+    assert_not_nil make_conditions_with_parameter('from' => '2010-10-10')[:created_at]
+  end
+
   should 'make_conditions_with_parameter return created_at parameter if until period is defined' do
     assert_not_nil make_conditions_with_parameter(:until => '2010-10-10')[:created_at]
   end
 
-#  should 'the beginning of the period be the first existent date if no from date is passsed as parameter' do
+  should 'make_conditions_with_parameter return created_at parameter if until period is defined as string' do
+    assert_not_nil make_conditions_with_parameter('until' => '2010-10-10')[:created_at]
+  end
+
   should 'make_conditions_with_parameter return created_at as the first existent date as parameter if only until is defined' do
     assert_equal Time.at(0).to_datetime, make_conditions_with_parameter(:until => '2010-10-10')[:created_at].min
   end
diff --git a/test/unit/api/session_test.rb b/test/unit/api/session_test.rb
index 1695d3e..84e4712 100644
--- a/test/unit/api/session_test.rb
+++ b/test/unit/api/session_test.rb
@@ -1,6 +1,6 @@
 require File.dirname(__FILE__) + '/test_helper'
 
-class APITest < ActiveSupport::TestCase
+class SessionTest < ActiveSupport::TestCase
 
   def setup
     login_api
--
libgit2 0.21.2