feat(gradebook): add gradebook page with column picker and CSV export

Introduces a course-wide gradebook showing per-student grades across all assessments. Instructors can toggle which assessment columns are visible via a hierarchical column picker (grouped by category/tab), then export the current view to CSV.

Backend adds GradebookController#index (JSON), ability guard, and model methods on Assessment and Submission for fetching grade data.

Table lib gains reusable ColumnPickerTemplate, MuiColumnPickerDialog, ColumnPickerTreeGroup, and toolbar integration used by the gradebook.

Author: LWS49

app/controllers/components/course/gradebook_component.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+class Course::GradebookComponent < SimpleDelegator
+  include Course::ControllerComponentHost::Component
+
+  def self.display_name
+    'Gradebook'
+  end
+
+  def sidebar_items
+    return [] unless can?(:read_gradebook, current_course)
+
+    [
+      {
+        key: self.class.key,
+        icon: :gradebook,
+        title: I18n.t('course.gradebook.component.sidebar_title'),
+        type: :admin,
+        weight: 4,
+        path: course_gradebook_path(current_course)
+      }
+    ]
+  end
+end

app/controllers/course/gradebook_controller.rb

@@ -0,0 +1,49 @@
+# frozen_string_literal: true
+class Course::GradebookController < Course::ComponentController
+  before_action :authorize_read_gradebook!
+
+  def index
+    respond_to do |format|
+      format.json do
+        @published_assessments = fetch_published_assessments
+        @categories, @tabs = fetch_categories_and_tabs
+        @students = fetch_students
+        assessment_ids = @published_assessments.pluck(:id)
+        @assessment_max_grades = Course::Assessment.max_grades(assessment_ids)
+        @submissions = Course::Assessment::Submission.grade_summary(
+          student_ids: @students.map(&:user_id),
+          assessment_ids: assessment_ids
+        )
+      end
+    end
+  end
+
+  private
+
+  def authorize_read_gradebook!
+    authorize! :read_gradebook, current_course
+  end
+
+  def component
+    current_component_host[:course_gradebook_component]
+  end
+
+  def fetch_categories_and_tabs
+    tabs = @published_assessments.map(&:tab).uniq(&:id)
+    [tabs.map(&:category).uniq(&:id), tabs]
+  end
+
+  def fetch_students
+    current_course.levels.to_a
+    current_course.course_users.students.without_phantom_users.
+      calculated(:experience_points).includes(:user).to_a
+  end
+
+  def fetch_published_assessments
+    current_course.assessments.
+      published.
+      includes(tab: :category).
+      joins(tab: :category).
+      reorder('course_assessment_categories.weight, course_assessment_tabs.weight, course_assessments.id')
+  end
+end

app/models/components/course/gradebook_ability_component.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+module Course::GradebookAbilityComponent
+  include AbilityHost::Component
+
+  def define_permissions
+    can :read_gradebook, Course, id: course.id if course_user&.staff?
+    super
+  end
+end

app/models/course/assessment.rb

@@ -160,6 +160,22 @@ def self.use_relative_model_naming?
     true
   end
 
+  # Returns a hash of assessment_id => max_grade (sum of question maximum_grades).
+  def self.max_grades(assessment_ids)
+    return {} if assessment_ids.empty?
+
+    rows = find_by_sql(
+      sanitize_sql_array([<<-SQL.squish, assessment_ids])
+        SELECT cqa.assessment_id, COALESCE(SUM(caq.maximum_grade), 0) AS max_grade
+        FROM course_question_assessments cqa
+        JOIN course_assessment_questions caq ON caq.id = cqa.question_id
+        WHERE cqa.assessment_id IN (?)
+        GROUP BY cqa.assessment_id
+      SQL
+    )
+    rows.to_h { |row| [row.assessment_id, row.max_grade.to_f] }
+  end
+
   def to_partial_path
     'course/assessment/assessments/assessment'
   end

app/models/course/assessment/submission.rb

@@ -323,6 +323,27 @@ def self.on_dependent_status_change(answer)
     answer.submission.last_graded_time = Time.now
   end
 
+  # Returns an array of submission rows for the given students and assessments.
+  # Each row has: student_id (creator_id), assessment_id, grade (float).
+  # Only graded/published submissions are included.
+  def self.grade_summary(student_ids:, assessment_ids:)
+    return [] if student_ids.empty? || assessment_ids.empty?
+
+    find_by_sql(
+      sanitize_sql_array([<<-SQL.squish, student_ids, assessment_ids])
+        SELECT cas.creator_id AS student_id, cas.assessment_id,
+               SUM(caa.grade) AS grade
+        FROM course_assessment_submissions cas
+        JOIN course_assessment_answers caa ON caa.submission_id = cas.id
+        WHERE cas.creator_id IN (?)
+          AND cas.assessment_id IN (?)
+          AND cas.workflow_state IN ('graded', 'published')
+          AND caa.current_answer = TRUE
+        GROUP BY cas.creator_id, cas.assessment_id
+      SQL
+    )
+  end
+
   private
 
   # Queues the submission for auto grading, after the submission has changed to the submitted state.

app/views/course/gradebook/index.json.jbuilder

@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+json.categories @categories do |cat|
+  json.id cat.id
+  json.title cat.title
+end
+
+json.tabs @tabs do |tab|
+  json.id tab.id
+  json.title tab.title
+  json.categoryId tab.category_id
+end
+
+json.assessments @published_assessments do |assessment|
+  json.id assessment.id
+  json.title assessment.title
+  json.tabId assessment.tab_id
+  json.maxGrade @assessment_max_grades[assessment.id] || 0
+end
+
+json.students @students do |course_user|
+  json.id course_user.user_id
+  json.name course_user.name
+  json.email course_user.user.email
+  json.level course_user.level_number
+  json.totalXp course_user.experience_points
+end
+
+json.submissions @submissions do |sub|
+  json.studentId sub.student_id
+  json.assessmentId sub.assessment_id
+  json.grade sub.grade&.to_f
+end
+
+json.gamificationEnabled current_course.gamified?

client/app/api/course/Gradebook.ts

@@ -0,0 +1,15 @@
+import { GradebookData } from 'types/course/gradebook';
+
+import { APIResponse } from 'api/types';
+
+import BaseCourseAPI from './Base';
+
+export default class GradebookAPI extends BaseCourseAPI {
+  get #urlPrefix(): string {
+    return `/courses/${this.courseId}/gradebook`;
+  }
+
+  index(): APIResponse<GradebookData> {
+    return this.client.get(this.#urlPrefix);
+  }
+}

client/app/api/course/index.js

@@ -12,6 +12,7 @@ import DuplicationAPI from './Duplication';
 import EnrolRequestsAPI from './EnrolRequests';
 import ExperiencePointsRecordAPI from './ExperiencePointsRecord';
 import ForumAPI from './Forum';
+import GradebookAPI from './Gradebook';
 import GroupsAPI from './Groups';
 import LeaderboardAPI from './Leaderboard';
 import LearningMapAPI from './LearningMap';
@@ -48,6 +49,7 @@ const CourseAPI = {
   experiencePointsRecord: new ExperiencePointsRecordAPI(),
   folders: new FoldersAPI(),
   forum: ForumAPI,
+  gradebook: new GradebookAPI(),
   groups: new GroupsAPI(),
   leaderboard: new LeaderboardAPI(),
   learningMap: new LearningMapAPI(),