fixed bugfix where another user could not store the same object again

fixed the primary keys => all the classes have now composite primary key which contais an id + user_id, necessary gem: 'composite_primary_keys'
fixed the user_id relation => every class now "belongs_to" user

pls kill me know

app/controllers/crawlers/projects_crawler_controller.rb

@@ -36,9 +36,9 @@ class Crawlers::ProjectsCrawlerController < Crawlers::TissCrawlerController
     @project = TissCrawler.get_project_details(params)
 
     # create stores the object to the db after creation
-    favorite_hash = {id: params[:id],
+    favorite_hash = {id: [params[:id], current_user.id],
                      # the user who is currently active
-                     user_id: current_user.id,
+                     # user_id: current_user.id,
                      title: @project['titleDe']}
     if FavoriteProject.create(favorite_hash).valid?
       FavoriteProject.create(favorite_hash)

app/controllers/crawlers/theses_crawler_controller.rb

@@ -36,9 +36,9 @@ class Crawlers::ThesesCrawlerController < Crawlers::TissCrawlerController
     @thesis = TissCrawler.get_thesis_details(params)
 
     # create stores the object to the db after creation
-    favorite_hash = {id: params[:id],
+    favorite_hash = {id: [params[:id], current_user.id],
                      # the user who is currently active
-                     user_id: current_user.id,
+                     # user_id: current_user.id,
                      title: @thesis['title']['de']}
     if FavoriteThesis.create(favorite_hash).valid?
       FavoriteThesis.create(favorite_hash)