splitted user in groups for assigning bonus exercises

app/models/proxy_exercise.rb

@@ -53,7 +53,20 @@ class ProxyExercise < ActiveRecord::Base
     end
 
     def find_matching_exercise(user)
-      exercises_user_has_accessed = user.submissions.where("cause IN ('submit','assess')").map{|s| s.exercise}.uniq
+      user_group = UserGroupSeparator.getProxyExerciseGroup(user)
+      case user_group
+        when :dummy_assigment
+          rec_ex = select_easiest_exercise(exercises)
+          @reason[:reason] = "dummy group"
+          Rails.logger.debug("assigned user to dummy group, and gave him exercise: #{rec_ex.title}")
+          rec_ex
+        when :random_assigment
+          @reason[:reason] = "random group"
+          rec_ex = exercises.shuffle.first
+          Rails.logger.debug("assigned user to random group, and gave him exercise: #{rec_ex.title}")
+          rec_ex
+        when :recommended_assignment
+          exercises_user_has_accessed = user.submissions.where("cause IN ('submit','assess')").map{|s| s.exercise}.uniq.compact
           tags_user_has_seen = exercises_user_has_accessed.map{|ex| ex.tags}.uniq.flatten
           Rails.logger.debug("exercises_user_has_accessed #{exercises_user_has_accessed.map{|e|e.id}.join(",")}")
 
@@ -76,6 +89,8 @@ class ProxyExercise < ActiveRecord::Base
             recommended_exercise
           end
       end
+
+    end
     private :find_matching_exercise
 
     def select_best_matching_exercise(user, exercises_user_has_accessed, potential_recommended_exercises)

lib/user_group_separator.rb

@@ -16,10 +16,13 @@ class UserGroupSeparator
   def self.getProxyExerciseGroup(user)
     lastDigitCreatedAt = user.created_at.to_i % 10
     if lastDigitCreatedAt < 2 # 0,1
+      puts "dummy"
       :dummy_assigment
     elsif lastDigitCreatedAt < 4 # 2,3
+      puts "random_assignment"
       :random_assigment
     else # 4,5,6,7,8,9
+      puts "recommended_assignment"
       :recommended_assignment
     end
   end