My code:

  def start
    redirect_to client.authorization.authorize_url(:redirect_uri => callback_oauth_url,
                                                   :scope => "email,user_birthday,user_hometown,user_interests,user_location,user_notes,user_status,sms,publish_stream")
  end
  
  def callback
    access_token = client.authorization.process_callback params[:code], :redirect_uri => callback_oauth_url
    session[:access_token] = access_token
    render :json => client.selection.me.info! # <-- HERE IS THE ERROR >.<
  end

I went to /oauth/start/ and successfully signed in and allowed my app. Afterwards, Facebook redirected me back开发者_如何转开发 to my app, which gave this error:

NoMethodError in OauthController#callback

undefined method `encode_json' for true:TrueClass

We all hate errors and so do I. How can I fix this? Thanks.

The info! method returns an instance of FBGraph::Result, you need to call data on it so that Rails can encode it into JSON. The following code works fine for me :

render :json => client.selection.me.info!.data