diff --git a/app/controllers/readings_controller.rb b/app/controllers/readings_controller.rb
index e09fadc..902ca5a 100644
--- a/app/controllers/readings_controller.rb
+++ b/app/controllers/readings_controller.rb
@@ -11,7 +11,7 @@ class ReadingsController < ApplicationController
 
   def create
     @reading = Reading.new(reading_params)
-    @reading.group_id = params[:reading_group_id]
+    @reading.group_id = params[:reading_group_id].to_i
     respond_to do |format|
       create_and_redir(format)
     end
diff --git a/app/models/reading.rb b/app/models/reading.rb
index 1073222..9e9a3c1 100644
--- a/app/models/reading.rb
+++ b/app/models/reading.rb
@@ -1,7 +1,10 @@
 class Reading < KalibroGem::Entities::Reading
 	include KalibroRecord
+  
+  attr_accessor :label, :grade, :color
 
-  validates :color, presence: true
   validates :label, presence: true, kalibro_uniqueness: true
+  validates :grade, presence: true
+  validates :color, presence: true
 
 end
--
libgit2 0.21.2