I'm currently working on a project that employs this concept; we use Rails for the heavy lifting, registration, payments, etc (lots of complex stuff), and we us

I'm currently working on a project that employs this concept; we use Rails for the heavy lifting, registration, payments, etc (lots of complex stuff), and we use Wordpress to allow our client to easily create beautiful things. The truth of the matter is that making a rails app that covers the flexibility that Wordpress allows (including things like Yoast's seo plugin, for instance) is just infeasible in Rails. The newest update to Wordpress is also quite beautiful. I've been building on Rails and Wordpress for a while now, and have yet to see a full featured solution to flexible content management that equals or surpasses WP. I have yet to see something that makes data transformation and api creation as easy as rails does. (These are gross overstatements, but the point is that the two tools are very different in key ways, and can be used to complement each other if those differences are respected.)