Module: ActionController::Head

Included in:
ConditionalGet
Defined in:
lib/action_controller/metal/head.rb

Instance Method Summary collapse

Instance Method Details

#head(status, options = {}) ⇒ Object

Returns a response that has no content (merely headers). The options argument is interpreted to be a hash of header names and values. This allows you to easily return a response that consists only of significant headers:

head :created, location: person_path(@person)

head :created, location: @person

It can also be used to return exceptional conditions:

return head(:method_not_allowed) unless request.post?
return head(:bad_request) unless valid_request?
render

See Rack::Utils::SYMBOL_TO_STATUS_CODE for a full list of valid status symbols.



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# File 'lib/action_controller/metal/head.rb', line 19

def head(status, options = {})
  if status.is_a?(Hash)
    msg = status[:status] ? 'The :status option' : 'The implicit :ok status'
    options, status = status, status.delete(:status)

    ActiveSupport::Deprecation.warn(<<-MSG.squish)
      #{msg} on `head` has been deprecated and will be removed in Rails 5.1.
      Please pass the status as a separate parameter before the options, instead.
    MSG
  end

  status ||= :ok

  location = options.delete(:location)
  content_type = options.delete(:content_type)

  options.each do |key, value|
    headers[key.to_s.dasherize.split('-').each { |v| v[0] = v[0].chr.upcase }.join('-')] = value.to_s
  end

  self.status = status
  self.location = url_for(location) if location

  self.response_body = ""

  if include_content?(self.response_code)
    self.content_type = content_type || (Mime[formats.first] if formats)
    self.response.charset = false
  end

  true
end