instructure/canvas-lms · error · PeerReview::ParentOverrideNotFoundError

Parent assignment Section override not found for section

Error message

Parent assignment Section override not found for section %{section_id}

What it means

PeerReview::ParentOverrideNotFoundError raised when validate_section_parent_override_exists cannot find the parent Section override for the given section_id. The peer-review flow requires a parent section override before creating per-section child overrides.

Solutions

1. Run the parent override creation/sync for the course's sections before child creation
2. Confirm section_id belongs to the assignment's course
3. Create the missing parent Section override explicitly
4. Check for deleted/failed parent-override records and re-create them

Example fix

// before
PeerReview::CreateChildOverride.call(parent_override: nil, section_id: section.id)
// after
parent = PeerReview::EnsureSectionParentOverride.call(assignment:, section:)
PeerReview::CreateChildOverride.call(parent_override: parent, section_id: section.id)

parent = assignment.assignment_overrides.active.find_by(set_type: 'CourseSection', set_id: section_id)
raise ArgumentError, 'missing parent section override' unless parent

null

begin
  PeerReview::CreateChildOverride.call(parent_override:, section_id:)
rescue PeerReview::ParentOverrideNotFoundError
  # create parent section override, then retry
end

When it happens

Trigger: Creating a peer-review section child override when no parent override exists for that course_section_id — section added after parent generation, parent deleted, or wrong section id passed.

Common situations: New course sections created after initial override setup; section merged/deleted; sync job that creates parents failed or hasn't run; passing a section from a different course.

Understand the failure class

Background: Record Not Found Errors: "not found", RecordNotFound, and "was not found" — what they mean and how to fix them — this error's family across 28 libraries.

Related errors

• Parent assignment ADHOC override not found for students
• Parent assignment Course override not found for course
• Parent assignment Group override not found for group
• Group does not exist
• Section does not exist

AI-assisted analysis of instructure/canvas-lms@1c9f0bb801 (2026-09-15). Data as JSON: /api/errors/279f8461202377dc. Report an issue: GitHub.

Appendix: source

Thrown at app/services/peer_review/validations.rb:265

  end

  def validate_course_parent_override_exists(parent_override, course_id)
    unless parent_override.present?
      raise PeerReview::ParentOverrideNotFoundError,
            I18n.t("Parent assignment Course override not found for course %{course_id}", course_id:)
    end
  end

  def validate_group_parent_override_exists(parent_override, group_id)
    unless parent_override.present?
      raise PeerReview::ParentOverrideNotFoundError,
            I18n.t("Parent assignment Group override not found for group %{group_id}", group_id:)
    end
  end

  def validate_section_parent_override_exists(parent_override, section_id)
    unless parent_override.present?
      raise PeerReview::ParentOverrideNotFoundError,
            I18n.t("Parent assignment Section override not found for section %{section_id}", section_id:)
    end
  end
end

View on GitHub (pinned to 1c9f0bb801)