How to handle exception in format.xml

rubyonrails-talk
1

I am developing an API for my application.

Here is the standard show method.

def show

@city = City.find(params[:id], :include => :state)

respond_to do |format|

format.html

format.xml

end

end

For a browser based action if the params[:id] is missing then ActiveRecord::RecordNotFound exception is raised which I let Rails handle. This results in public/404.html.

However in API I need to catch the exception and then I need to return an xml with the error message. What is the best way to handle that. Any example will be helpful

Right now even if I catch the exception then after catching the exception I need to process two different ways for html and xml. Secondly I need to know if I am processing html or xml. How do I find out if I am handing html or xml. Is there a utility method?

  • Neeraj
2

Look at the bottom of the create or update methods in the controller. Both have examples of handling errors that should serve as examples.

3

The update scenario doesn't handle if @city = City.find(params[:id]) throws ActiveRecrod::RecordNotFound exception.

I want to return an xml stating that no record was found for the given id.

I can catch the exception but am not sure what is the best way to handle this case when I must return an xml response every single time.

4

If that's kind of a global rule you can easily program a catchall with rescue_from in Rails 2, respond_to is available in the handler as well.

-- fxn