Rails Response

Response method

render

There are some examples
Call template which is different from action name

render action: 'index'   # template index.html.erb

Call other directory template

render template: 'hello/view'    hello/view.html.erb

Call template out side of application(using path)

render file: 'data/template/list'

inline response

text

render text: ''

inline
argument text is defined as ERB template

render inline: 'Request Info : <%= debug request.headers %>'

redirect_to

Redirect examples

redirect_to 'http://google.com.sg'
redirect_to action: :index
redirect_to controller: :hello, action: :list
redirect_to item_path			# view helper
redirect_to :back				# back one page

send file

Read file(path) and send client

send_file 'xxx.zip'
send_file 'xxx.jpg', type: 'image/jpeg', disposition: :inline
send_file 'xxx.pdf', filename: 'xxx.pdf'

Don’t use file path directly from the client.
File path should save in server side(db, or something)

send data

Receive binary data and display
(image file etc…)

def show_photo
  # if no parameter set 1
  id = params[:id] ? params[:id] : 1
  @item = Item.find(id)
  send_data @item.photo, type: @item.ctype, disposition: :inline
end

status code

status code only

render nothing: true, status: 404

Or

head 404

status code list

Use

head :not_found

XML/JSON

XML

def res_xml
  @items = Item.all
  render xml: @item
end

xml option
to_xml convert model to XML
Content-Type application/xml

JSON

def res_json
  @items = Item.all
  render json: @items
end