now an user can delete subjects separately

app/controllers/concerns/subjectable_controller.rb

@@ -14,10 +14,10 @@ module SubjectableController
 
     # DELETE /v1/learning_objects/1/subjects
     # DELETE /v1/learning_objects/1/subjects.json
-    #def unsubjecting
-    #  @owner.remove_subjects(subject_params[:id])
-    #  render json: subjects.tags, status: :ok
-    #end
+    def unsubjecting
+      subjectable.remove_subjects(ids: params[:subjects])
+      render json: subjectable.subjects, status: :ok
+    end
 
     protected