teamcapybara/capybara · error · ArgumentError

Selector #{@name} does not support #{format}

Error message

Selector #{@name} does not support #{format}

What it means

Error "Selector #{@name} does not support #{format}" thrown in teamcapybara/capybara.

Source

Thrown at lib/capybara/selector/selector.rb:61

      @format || @definition.default_format
    end
    alias_method :current_format, :format

    def enable_aria_label
      @config[:enable_aria_label]
    end

    def enable_aria_role
      @config[:enable_aria_role]
    end

    def test_id
      @config[:test_id]
    end

    def call(locator, **options)
      if format
        raise ArgumentError, "Selector #{@name} does not support #{format}" unless expressions.key?(format)

        instance_exec(locator, **options, &expressions[format])
      else
        warn 'Selector has no format'
      end
    ensure
      unless locator_valid?(locator)
        Capybara::Helpers.warn(
          "Locator #{locator.class}:#{locator.inspect} for selector #{name.inspect} must #{locator_description}. " \
          'This will raise an error in a future version of Capybara. ' \
          "Called from: #{Capybara::Helpers.filter_backtrace(caller)}"
        )
      end
    end

    def add_error(error_msg)
      errors << error_msg
    end

View on GitHub (pinned to 15b5fdb76e)

When it happens

Trigger: Thrown at lib/capybara/selector/selector.rb:61 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of teamcapybara/capybara@15b5fdb76e (2026-08-21). Data as JSON: /api/errors/1b8ff47ed60ff6f4. Report an issue: GitHub.