instructure/canvas-lms · error · EmbedNotFoundError

Resource not found in scan for key: #

Error message

Resource not found in scan for key: #{resource_group_key}

What it means

After locating the scan, validate_embed_exists_in_scan! checks scan.results[:resources] for the embed's resource_group_key. If the scan results have no entry for that key, EmbedNotFoundError is raised, meaning the embed's resource was never captured (or results were trimmed) during the scan phase.

Solutions

1. Re-run the youtube embed scan so results include the new/changed resource
2. Confirm the embed hash's resource_type and id match what the scan recorded (key format 'Type|id')
3. Inspect scan.results[:resources].keys to see which keys the scan actually captured
4. Ensure conversion is not racing an in-progress re-scan that reset results

Example fix

// before
service.convert_embed(scan_id, { resource_type: 'Assignment', id: bad_id, src: url })
// after
scan = YoutubeMigrationService.find_scan(course, scan_id)
key = "Assignment|#{assignment.id}"
if scan.results[:resources].blank? || scan.results[:resources][key.to_sym].blank?
  YoutubeMigrationService.run_scan(course) # refresh results
end
service.convert_embed(scan_id, embed)

key = "#{embed[:resource_type]}|#{embed[:id]}"
scan = YoutubeMigrationService.find_scan(course, scan_id)
raise 'resource missing from scan; re-scan required' if scan.results.blank? || scan.results.dig(:resources, key.to_sym).blank?

begin
  service.convert_embed(scan_id, embed)
rescue YoutubeMigrationService::EmbedNotFoundError
  YoutubeMigrationService.run_scan(course)
  service.convert_embed(scan_id, embed)
end

When it happens

Trigger: convert_embed called with an embed whose resource_group_key (type|id) is absent from the scan's results hash, including when the resources hash itself is blank but total results exist for other keys.

Common situations: Embed added to the content after the scan ran; scan results truncated or partially saved; wrong resource_type/id embedded so the computed key doesn't match; results reset by a re-scan in progress.

Understand the failure class

Background: 'Could not be found', 'does not exist', 'not found in database': the resource-not-found family when an ID, slug, key, or URI lookup comes back empty — this error's family across 20 libraries.

Related errors

• Scan not found for id: #
• Cannot validate existence for resource type: #
• Checkpoint '# ' not found
• Checkpoints not found
• Course not found

AI-assisted analysis of instructure/canvas-lms@1c9f0bb801 (2026-09-15). Data as JSON: /api/errors/a91f61bfcfd73b36. Report an issue: GitHub.

Appendix: source

Thrown at app/services/youtube_migration_service.rb:153

  def initialize(course)
    self.course = course
  end

  def validate_scan_exists!(scan_id)
    YoutubeMigrationService.find_scan(course, scan_id)
  rescue ActiveRecord::RecordNotFound
    raise EmbedNotFoundError, "Scan not found for id: #{scan_id}"
  end

  def validate_embed_exists_in_scan!(scan_id, embed)
    scan = YoutubeMigrationService.find_scan(course, scan_id)
    resource_group_key = resource_group_key_for(embed)

    return if scan.results.blank? || scan.results[:resources].blank?

    resource = scan.results[:resources][resource_group_key]
    raise EmbedNotFoundError, "Resource not found in scan for key: #{resource_group_key}" if resource.blank?

    embed_exists = resource[:embeds].any? do |scan_embed|
      scan_embed[:src] == embed[:src] &&
        scan_embed[:field].to_s == embed[:field].to_s &&
        scan_embed[:resource_type] == embed[:resource_type]
    end

    raise EmbedNotFoundError, "Embed not found in scan for resource: #{resource_group_key}" unless embed_exists
  end

  def prepare_new_quiz_resource_type(resource_type)
    case resource_type
    when /QuizzesNext::Quiz/
      "QuizzesNext::Quiz"
    when /QuizzesNext::Bank/
      "QuizzesNext::Bank"
    else
      resource_type

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