#255: fix destroy learning_object with Institution owner

app/controllers/v1/learning_objects_controller.rb

@@ -63,7 +63,7 @@ class V1::LearningObjectsController < ApplicationController
   # DELETE /learning_objects/1
   # DELETE /learning_objects/1.json
   def destroy
-    LearningObject.destroy(@learning_object)
+    @learning_object.destroy
     render status: :ok
   end
 

db/migrate/20170525120237_add_learning_objects_count_to_institutions.rb

+class AddLearningObjectsCountToInstitutions < ActiveRecord::Migration[5.0]
+  def change
+    add_column :institutions, :learning_objects_count, :integer, default: 0
+  end
+end
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