Improve performance of the FlowrController

app/controllers/flowr_controller.rb

@@ -5,7 +5,8 @@ class FlowrController < ApplicationController
     require_user!
     # get the latest submission for this user that also has a test run (i.e. structured_errors if applicable)
     submission = Submission.joins(:testruns)
-      .where(submissions: {user_id: current_user.id, user_type: current_user.class.name})
+      .where(submissions: {user: current_user})
+      .includes(structured_errors: [structured_error_attributes: [:error_template_attribute]])
       .merge(Testrun.order(created_at: :desc)).first
 
     # Return if no submission was found
@@ -18,10 +19,9 @@ class FlowrController < ApplicationController
     # verify authorization for the submission, as all queried errors are generated by this submission anyway
     # and structured_errors don't have a policy yet
     authorize(submission)
-    errors = StructuredError.where(submission_id: submission.id)
 
     # for each error get all attributes, filter out uninteresting ones, and build a query
-    insights = errors.map do |error|
+    insights = submission.structured_errors.map do |error|
       attributes = error.structured_error_attributes.select do |attribute|
         interesting?(attribute) and attribute.match
       end