Rescuing from Twitter Gem

问题:

I have a tweets_controller

#called when user submits twitter form

def message
          unless current_user
            session[:twitter_message] = params[:twitter_message] #sets the message from the form so it's available for send_tweet in tweet.rb after we pass through omniauth
            redirect_to '/auth/twitter' #redirects to authorize via omniauth/twitter and create the user
          else
            @auth = Authorization.find_by_user_id(current_user)
            Tweet.update_status(@auth, params[:twitter_message])
            redirect_to edit_user_path(current_user), :notice => "Tweet sent."
          end
end

I'm trying to rescue when the status update fails. I want to display a flash message to the user, but -- this is as far as I can seem to get:

def self.update_status(auth, msg)

     @token = auth.token
     @secret = auth.secret
     @message = msg
     @t = Twitter::Client.new

     Twitter.configure do |config|
       config.consumer_key = '[key]'
       config.consumer_secret = '[secret]'
       config.oauth_token = @token
       config.oauth_token_secret = @secret
       config.gateway = '[gateway_url]'
     end

     ret = @t.update(@message)
     tweet ||= Tweet.create_from_response(ret, auth.id)

    rescue Twitter::Error => e
      logger.error "#{e.message}."
end

How do I get the error message so I can display it to my user through the controller?

回答1:

You can create and throw a custom exception based on the application.

In app/lib/could_not_update_status_error.rb

class CouldNotUpdateStatusError < StandardError
end

Then in your model:

rescue Twitter::Error => e
  logger.error "#{e.message}."
  raise CouldNotUpdateStatusError.new("Could not update status")

And in your controller

else
  begin
    @auth = Authorization.find_by_user_id(current_user)
    Tweet.update_status(@auth, params[:twitter_message])
    redirect_to edit_user_path(current_user), notice: "Tweet sent."
  rescue CoundNotUpdateStatusError => e
    # Do error stuff
end

Another option would be to do rescue return false in your Twitter::Error clause and wrap the update_status call in an if statement, however Exceptions are a more robust solution.