Return JSON to GET request

Question

I need to get JSON to specific URLs in my application.

• I have generated controller:

  rails generate controller api
  

  • I have added 'test' method to my controller:

    def test
      respond_to do |format|
       message = { :last_sync => "hi!" }
       format.json { render :json => message }
    end
    

  • I have added route:

    # api section
    get 'api/test' => 'api#test'
    

When I trying to get URL: .../api/test I get the error

ActionController::UnknownFormat

on the line:

respond_to do | format |

Why and how can I fix it ?

Answer 1

Use simple render without respond_to block:

def test
  message = { :last_sync => "hi!" }
  render :json => message
end

respond_to block needs if you want render many different formats. Like html, json e.t.c in one action.