second attempt of making favorite people view sortable

app/controllers/favorites_controller.rb

@@ -1,11 +1,17 @@
 class FavoritesController < ApplicationController
+  helper_method :sort_column, :sort_direction
 
   def people
     @favorite_people = FavoritePerson.where('user_id': current_user.id)
-                           .order(params[:sort])
+                           .order(sort_column + " " + sort_direction)
     @host = 'https://tiss.tuwien.ac.at'
   end
 
+  def delete_person
+    FavoritePerson.find_by_tiss_id(params[:tiss_id]).destroy
+    redirect_back(fallback_location: people)
+  end
+
   def courses
 
   end
@@ -17,4 +23,14 @@ class FavoritesController < ApplicationController
   def projects
 
   end
+
+  private
+
+  def sort_column
+    params[:sort] || 'first_name'
+  end
+
+  def sort_direction
+    params[:direction] || 'asc'
+  end
 end