send_data

Sends the given binary data to the browser. This method is similar to render plain: data, but also allows you to specify whether the browser should display the response as a file attachment (i.e. in a download dialog) or as inline data. You may also set the content type, the file name, and other things.

Options:

• :filename - suggests a filename for the browser to use.

• :type - specifies an HTTP content type. Defaults to application/octet-stream. You can specify either a string or a symbol for a registered type with Mime::Type.register, for example :json. If omitted, type will be inferred from the file extension specified in :filename. If no content type is registered for the extension, the default type application/octet-stream will be used.

• :disposition - specifies whether the file will be shown inline or downloaded. Valid values are "inline" and "attachment" (default).

• :status - specifies the status code to send with the response. Defaults to 200.

Generic data download:

send_data buffer

Download a dynamically-generated tarball:

send_data generate_tgz('dir'), filename: 'dir.tgz'

Display an image Active Record in the browser:

send_data image.data, type: image.content_type, disposition: 'inline'

See send_file for more information on HTTP Content-* headers and caching.

# File actionpack/lib/action_controller/metal/data_streaming.rb, line 111
      def send_data(data, options = {}) # :doc:
        send_file_headers! options
        render options.slice(:status, :content_type).merge(body: data)
      end

op = Operation.find(params[:id])
fname = "operation_#{op.id}_#{DateTime.now.to_i}.csv"
send_data op.export(params[:url_type]), 
  :type => 'text/csv; charset=iso-8859-1; header=present',
  :disposition => "attachment; filename=#{fname}.csv"

def export(url_type)
csv_data = CSV.generate do |csv|
  csv << self.header_columns # simple array ["id","name"]
  url_items = @operation.url_items.where(:url_type => url_type)
  url_items.each do |url_item|
    csv << self.process_row(url_item)  # simple array [1,"bob"]
  end 
end 
return csv_data
end

http = Net::HTTP.new(@page.host)
res = http.post(path, info.to_query, headers)
send_data res, :content_type => res.content_type, :disposition => res["Content-Disposition"], status: res.code