Result multiplier

app/channels/api_channel.rb

@@ -3,10 +3,12 @@ class ApiChannel < ApplicationCable::Channel
 
   def subscribed
     ensure_confirmation_sent
+    task = Task.find task_id
     dispatch_self 'app/start'
     dispatch_self 'users/load', task_users.order(:judge_secret).pluck(:judge_secret)
     dispatch_self 'criteria/load', task_criterions.order(:position)
-    dispatch_self 'judges/load', Task.find(task_id).judges
+    dispatch_self 'judges/load', task.judges
+    dispatch_self 'resultMultiplier/load', task.result_multiplier
     dispatch_self 'results/load', CriterionUserResult.includes(:user).where(criterion: task_criterions)
     dispatch_self 'comments/load', Comment.includes(:user).where(task_id:)
     dispatch_self 'locks/load', RedisLockManager.all
@@ -62,6 +64,15 @@ def delete_judge data
     end
   end
 
+  def write_result_multiplier data
+    return unless scoring_open data
+
+    task = Task.find task_id
+    task.result_multiplier = data['value']
+    task.save!
+    dispatch_all 'resultMultiplier/load', task.result_multiplier
+  end
+
   def drag_drop data
     return unless scoring_open data
 
@@ -144,11 +155,13 @@ def finish data
 
     users_without_result = []
     begin
+      result_multiplier = Rational task.result_multiplier
+
       ActiveRecord::Base.transaction do
         task.contest.users.find_each do |user|
           user_result = CriterionUserResult.where user:, criterion: task.criterions
           users_without_result << user.judge_secret unless user_result.count == task.criterions_count
-          score = user_result.sum :value
+          score = user_result.sum(:value) * result_multiplier
           Result.create_or_find_by!(user:, task:).update!(score:)
         end
 

db/migrate/20230930203405_add_result_multiplier_to_tasks.rb

@@ -0,0 +1,5 @@
+class AddResultMultiplierToTasks < ActiveRecord::Migration[7.0]
+  def change
+    add_column :tasks, :result_multiplier, :string, default: '1', null: false
+  end
+end

db/structure.sql

@@ -373,7 +373,8 @@ CREATE TABLE public.tasks (
     updated_at timestamp(6) without time zone NOT NULL,
     criterions_count integer DEFAULT 0 NOT NULL,
     scoring_open boolean DEFAULT true NOT NULL,
-    judges character varying[] DEFAULT '{}'::character varying[] NOT NULL
+    judges character varying[] DEFAULT '{}'::character varying[] NOT NULL,
+    result_multiplier character varying DEFAULT '1'::character varying NOT NULL
 );
 
 
@@ -919,6 +920,7 @@ INSERT INTO "schema_migrations" (version) VALUES
 ('20230630172057'),
 ('20230902145307'),
 ('20230902145308'),
-('20230902145309');
+('20230902145309'),
+('20230930203405');