The most of deployment tutorials focus on setting up one machine with Nginx, Unicorn and Mysql.

It would be nice to have a good tutorial explaining how to setup multiple server with automated scaling process.

Integrate paypal with a rails app

I create my blog site in ruby on rails, then i need easy way to use tinymce or ckeditor to create posts with nice looking views, something like in your sites. I try many things but still i dont achives my goal.

You could show us how to implement editor for post with highlighting.

Show how to create a nested form like in this deprecated RailsCasts: http://railscasts.com/episodes/197-nested-model-form-part-2 or in this stackoverflow post: http://stackoverflow.com/questions/15568431/adding-dynamic-fields-to-nested-form-through-ajax

Since Rails 4.1.2 we can't just add a constraint to our routes resource and update the model with;

def to_param,
[id, slug].join('/')
end

I've been trying to read all the issues posted to rails on this, but I'm still at a loss on how to do it. For now I haven't updated Rails, which of course isn't healthy.

An episode detailing how this should now be accomplished in 4.1.2 would be great.

Thanks!

A screencast showing some common rake tasks for cleanup, logs, firing off emails, performing some function. 3-4 examples of useful rake tasks and demonstrate how to schedule with Whenever instead of cron.

I would love to see a screencast on professional debugging with Rails. What tools to use (Pry, Better Errors, ...), techniques, tips, etc ...

Text on your large screen monitor can be hard to read. Perhaps for the screen casts you could use a larger font?

being able to create A Rails Development Environment with Docker and Vagrant using VMWare Fusion box (Docker-friendly Vagrant base boxes from https://github.com/phusion/open-vagrant-boxes)

How does rails convention help/intend you to organize your assets when you would like to selectively include only certain assets for certain pages? How does this work when applications start to get larger?

There's been some changes between routing in Rails release versions. It would be nice to have a quick tutorial covering member, collection, nests, custom routes. A lot of folks have a hard time wrapping their head around routing. I know I did when I first started.

How to do it manually as a foundational exercise; and how to implement it using a popular gem.
Users have high expectations for search functionality these days and it is commonly at the heart of most modern applications. How do the pros do it?

How to test Javascript functionality in your Rails app.