I would love to see more about nested resources and nested attributes. setting up controllers and forms.

Chirs, every screencast of yours has been awesome! Thank you!

Creating a registration system for two types of users (two forms), such as publisher Vs advertiser

Create a basic CMS using Rails

Emberjs with Rails

Nested polymorphic comments with upvotes/downvotes

I am not sure if you have posted a video on this topic or not, but I'd love a video detailing how to migrate existing data within a database. I've come across a couple of tutorials that talk about writing migrations to change data or re-format data in a database but I'm still a bit fuzzy on the topic.

In guides area, you could post something about the text editor Vim, that you use. Post some tutorial about how to use vim.

background job processing. Sidekiq, or what has become the accepted standard.

creating a state and city directory.

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!