Configurable challenge points

app/views/challenges/_form.html.haml

@@ -4,3 +4,4 @@
 = form.input :checked
 = form.input :description
 = form.input :test_case
+= form.input :points

db/migrate/20200907151730_add_points_to_challenges.rb

@@ -0,0 +1,5 @@
+class AddPointsToChallenges < ActiveRecord::Migration
+  def change
+    add_column :challenges, :points, :integer, null: false, default: 1
+  end
+end

db/migrate/20200907151928_read_challenge_points_in_points_breakdown.rb

@@ -0,0 +1,133 @@
+class ReadChallengePointsInPointsBreakdown < ActiveRecord::Migration
+  def build_view_sql(challenges_sql)
+    <<-SQL
+      CREATE VIEW points_breakdowns AS
+      WITH users_tasks AS (
+        SELECT
+          users.id AS user_id,
+          tasks.id AS task_id,
+          GREATEST(COALESCE(points + adjustment, 0), 0) AS points
+        FROM users
+        INNER JOIN tasks ON tasks.checked
+        LEFT JOIN solutions ON (solutions.task_id = tasks.id AND solutions.user_id = users.id)
+        ORDER BY users.id, tasks.id
+      ), tasks_summary AS (
+        SELECT
+          user_id,
+          array_agg(points) AS breakdown,
+          SUM(points) AS points
+        FROM users_tasks
+        GROUP BY user_id
+      ), users_quizzes AS (
+        SELECT
+          users.id AS user_id,
+          quizzes.id AS quiz_id,
+          COALESCE(points, 0) AS points
+        FROM users
+        INNER JOIN quizzes ON TRUE
+        LEFT JOIN quiz_results ON (quiz_results.quiz_id = quizzes.id AND quiz_results.user_id = users.id)
+        ORDER BY users.id, quizzes.id
+      ), quizzes_summary AS (
+        SELECT
+          user_id,
+          array_agg(points) AS breakdown,
+          SUM(points) AS points
+        FROM users_quizzes
+        GROUP BY user_id
+      ), stars_summary AS (
+        SELECT
+          users.id AS user_id,
+          COUNT(posts.starred) AS points
+        FROM users
+        LEFT JOIN posts ON posts.user_id = users.id AND posts.starred
+        GROUP BY users.id
+      ), vouchers_summary AS (
+        SELECT
+          users.id AS user_id,
+          COUNT(vouchers.id) AS points
+        FROM users
+        LEFT JOIN vouchers ON vouchers.user_id = users.id
+        GROUP BY users.id
+      ), attributions_summary AS (
+        SELECT
+          users.id AS user_id,
+          COUNT(attributions.id) AS points
+        FROM users
+        LEFT JOIN attributions ON attributions.user_id = users.id
+        GROUP BY users.id
+      ), challenges_summary AS (
+        #{challenges_sql}
+      ), photos_summary AS (
+        SELECT
+          id AS user_id,
+          (CASE
+            WHEN photo = '' THEN 0
+            WHEN photo IS NULL THEN 0
+            ELSE 1
+          END) AS points
+        FROM users
+      ), arrays_summary AS (
+        SELECT
+          users.id AS user_id,
+          COALESCE(tasks_summary.breakdown, '{}') AS tasks_breakdown,
+          COALESCE(tasks_summary.points, 0) AS tasks,
+          COALESCE(quizzes_summary.breakdown, '{}') AS quizzes_breakdown,
+          COALESCE(quizzes_summary.points, 0) AS quizzes
+        FROM users
+        LEFT JOIN tasks_summary ON tasks_summary.user_id = users.id
+        LEFT JOIN quizzes_summary ON quizzes_summary.user_id = users.id
+      )
+      SELECT
+        rank() OVER (ORDER BY arrays_summary.tasks + arrays_summary.quizzes + stars_summary.points + vouchers_summary.points + attributions_summary.points + challenges_summary.points + photos_summary.points DESC) AS rank,
+        users.id AS id,
+        users.name AS name,
+        users.faculty_number AS faculty_number,
+        arrays_summary.tasks_breakdown AS tasks_breakdown,
+        arrays_summary.tasks AS tasks,
+        challenges_summary.points AS challenges,
+        arrays_summary.quizzes_breakdown AS quizzes_breakdown,
+        arrays_summary.quizzes AS quizzes,
+        stars_summary.points AS stars,
+        vouchers_summary.points AS vouchers,
+        attributions_summary.points AS attributions,
+        photos_summary.points AS photo,
+        arrays_summary.tasks + arrays_summary.quizzes + stars_summary.points + vouchers_summary.points + attributions_summary.points + challenges_summary.points + photos_summary.points AS total
+      FROM users
+      LEFT JOIN arrays_summary ON arrays_summary.user_id = users.id
+      LEFT JOIN quizzes_summary ON quizzes_summary.user_id = users.id
+      LEFT JOIN stars_summary ON stars_summary.user_id = users.id
+      LEFT JOIN vouchers_summary ON vouchers_summary.user_id = users.id
+      LEFT JOIN attributions_summary ON attributions_summary.user_id = users.id
+      LEFT JOIN challenges_summary ON challenges_summary.user_id = users.id
+      LEFT JOIN photos_summary ON photos_summary.user_id = users.id
+      WHERE NOT users.admin
+      ORDER BY rank
+    SQL
+  end
+
+  def up
+    execute 'DROP VIEW points_breakdowns'
+    execute build_view_sql(<<-SQL)
+      SELECT
+        users.id AS user_id,
+        SUM(COALESCE(challenges.points, 0)) AS points
+      FROM users
+      LEFT OUTER JOIN challenge_solutions ON challenge_solutions.user_id = users.id AND challenge_solutions.correct
+      LEFT OUTER JOIN challenges ON challenges.id = challenge_solutions.challenge_id AND challenges.checked
+      GROUP BY users.id
+    SQL
+  end
+
+  def down
+    execute 'DROP VIEW points_breakdowns'
+    execute build_view_sql(<<-SQL)
+      SELECT
+        users.id AS user_id,
+        COUNT(challenges.id) AS points
+      FROM users
+      LEFT OUTER JOIN challenge_solutions ON challenge_solutions.user_id = users.id AND challenge_solutions.correct
+      LEFT OUTER JOIN challenges ON challenges.id = challenge_solutions.challenge_id AND challenges.checked
+      GROUP BY users.id
+    SQL
+  end
+end

spec/models/points_breakdown_spec.rb

@@ -93,9 +93,13 @@
   end
 
   it "assigns points for all correct challenges" do
-    challenge = create :challenge, checked: true
-    create :challenge_solution, challenge: challenge, user: user, correct: true
-    expect(breakdown.challenges).to eq 1
+    first_challenge = create :challenge, checked: true
+    create :challenge_solution, challenge: first_challenge, user: user, correct: true
+
+    second_challenge = create :challenge, checked: true, points: 5
+    create :challenge_solution, challenge: second_challenge, user: user, correct: true
+
+    expect(breakdown.challenges).to eq 6
   end
 
   it "does not assign points to incorrect challenge solutions" do