{"record":{"id":"b673575f6844f889","repo":"instructure/canvas-lms","slug":"no-pageid-or-fileid-provided","errorCode":null,"errorMessage":"No pageID or fileID provided","messagePattern":"No pageID or fileID provided","errorType":"validation","errorClass":"ContentUnavailable","httpStatus":null,"severity":"error","filePath":"app/services/study_assist.rb","lineNumber":146,"sourceCode":"      chips = TOOLS.each_with_object([]) do |(_, cfg), memo|\n        memo << { chip: cfg[:chip_label], prompt: cfg[:chip_label] } if @course.feature_enabled?(cfg[:feature_flag])\n      end\n      { chips: }\n    end\n\n    # --- Content resolution ---\n\n    def resolve_content\n      page_id = @state[\"pageID\"] || @state[:pageID]\n      file_id = @state[\"fileID\"] || @state[:fileID]\n\n      content =\n        if page_id.present?\n          resolve_page(page_id)\n        elsif file_id.present?\n          resolve_file(file_id)\n        else\n          raise ContentUnavailable, \"No pageID or fileID provided\"\n        end\n\n      if content.text.length > MAX_CONTENT_CHARS\n        raise ContentTooLarge, \"Content exceeds #{MAX_CONTENT_CHARS} character limit\"\n      end\n\n      content\n    end\n\n    def resolve_page(page_id)\n      page = @course.wiki_pages.not_deleted.find_by(url: page_id)\n      raise ContentUnavailable, \"Page not found\" if page.nil?\n      raise ContentUnavailable, \"Page access denied\" unless page.grants_right?(@user, :read)\n\n      shard_safe_key = shard_safe_cache_key_for(page)\n      text = Rails.cache.fetch(text_cache_key_for(:page, shard_safe_key), expires_in: TEXT_CACHE_TTL) do\n        html_to_text(page.body.to_s)\n      end","sourceCodeStart":128,"sourceCodeEnd":164,"githubUrl":"https://github.com/instructure/canvas-lms/blob/1c9f0bb8013ed69c4f2efe11fd483025469b7e6c/app/services/study_assist.rb#L128-L164","documentation":"StudyAssist::ContentUnavailable with message 'No pageID or fileID provided' is raised by resolve_content when neither page_id nor file_id was supplied, so there is no source content to extract text from for the LLM call. It is the terminal else branch of the page/file resolution if/elsif chain.","triggerScenarios":"Calling StudyAssist.new(course:, user:, prompt:) without page_id: and without file_id: (both nil/blank) on a tool whose prompt matched and requires source content, then invoking #call.","commonSituations":"Frontend omits the content identifier when the user didn't open a page/file context; API params named differently (e.g. page_url vs page_id) so page_id arrives blank; callers testing chip-only tools but hitting a content-requiring tool.","solutions":["Pass page_id: or file_id: when constructing StudyAssist for content-backed tools","Verify the controller/GraphQL layer maps the incoming content identifier params correctly","Guard the caller: only invoke StudyAssist with a content context present","Check params[:page_id].present? / params[:file_id].present? client-side before submitting"],"exampleFix":"// before\nStudyAssist.new(course: @course, user: @user, prompt: prompt).call\n// after\nStudyAssist.new(course: @course, user: @user, prompt: prompt, page_id: params[:page_id], file_id: params[:file_id]).call","handlingStrategy":"validation","validationCode":"raise ActionController::BadRequest if params[:page_id].blank? && params[:file_id].blank?","typeGuard":"null","tryCatchPattern":"begin\n  StudyAssist.new(course:, user:, prompt:, page_id:, file_id:).call\nrescue StudyAssist::ContentUnavailable => e\n  render json: { error: e.message }, status: :bad_request\nend","preventionTips":["Always pass a content identifier for content-backed tools","Validate params presence in controller before service call","Keep frontend param names aligned (page_id vs pageId)"],"tags":["ruby","study-assist","missing-argument","validation"],"backgroundTag":"missing-required-argument","analyzedSha":"1c9f0bb8013ed69c4f2efe11fd483025469b7e6c","analyzedAt":"2026-09-15T20:33:18.891Z","contentChangedAt":"2026-09-15T20:33:18.891Z","schemaVersion":2},"datasetVersion":"2026-09-23T02:17:17.105Z"}