find solved exercises of users now by fetching submissions with cause assess or submit

app/models/proxy_exercise.rb

@@ -42,11 +42,10 @@ class ProxyExercise < ActiveRecord::Base
     def findMatchingExercise(user)
       #exercises.shuffle.first
       # hier vielleicht nur betrachten wenn der user die aufgabe assessed oder submitted hat
-      exercisesUserHasAccessed = user.submissions.map{|s| s.exercise}.uniq
+      exercisesUserHasAccessed = user.submissions.where("cause IN ('submit','assess')").map{|s| s.exercise}.uniq
       tagsUserHasSeen = exercisesUserHasAccessed.map{|ex| ex.tags}.uniq.flatten
       puts "exercisesUserHasAccessed #{exercisesUserHasAccessed}"
 
-
       # find execises
       potentialRecommendedExercises = []
       exercises.each do |ex|