Ruby on Rails Best Practices

I have worked with ruby on rails framework 1 year, and my friend and I find some ways that might be best practices in this framework.

1. If your logic code that interacts with database is complicated, you should make it as a class method so that this method could be reusable by other developers in the team. You can return true/false to indicate this process is successful or failed if you don't want any validation errors object. You can also return object/an array of object to get validation errors.

2. Don't use render :update do |page|....end which is the bad thing because it returns a javascript code to the browser. And don't use link_to_remote :update => "id" because this code also generates javascript code back to the browser. Instead, use render :partial => 'update' to render the plain html code back to the browser and use oncomplete callback to replace the old content with the new result such as: document.getElementById('id').innerHTML = request.responseText;