- added abc group separator class to split users into different groups for testing proxy exercises and interventions

- shows 2 interventions per user and exercise max now
- only show break or rfc intervention to user

lib/user_group_separator.rb

@@ -0,0 +1,27 @@
+class UserGroupSeparator
+
+  # seperates user into 30% no intervention, 30% break intervention, 40% rfc intervention
+  def self.getInterventionGroup(user)
+    lastDigitId = user.id % 10
+    if lastDigitId < 3 # 0,1,2
+      :no_intervention
+    elsif lastDigitId < 6 # 3,4,5
+      :break_intervention
+    else # 6,7,8,9
+      :rfc_intervention
+    end
+  end
+
+  # seperates user into 20% dummy assignment, 20% random assignemnt, 60% recommended assignment
+  def self.getProxyExerciseGroup(user)
+    lastDigitCreatedAt = user.created_at.to_i % 10
+    if lastDigitCreatedAt < 2 # 0,1
+      :dummy_assigment
+    elsif lastDigitCreatedAt < 4 # 2,3
+      :random_assigment
+    else # 4,5,6,7,8,9
+      :recommended_assignment
+    end
+  end
+
+end