My rails app has couple of content generating resources like Article, Blog Posts, etc..
I can generate the RSS for each individual resource but I'm not getting how to synchronize into one RSS feed for these multiple feeds.
Currently I've setup the Articles feed via FeedBurner and even FeedBurner doesn't have this facility to merge different RSS of the same app into one so that I users can subscribe to individual RSS (Which I've done already) or to just a single main feed to get all the updates.
I can't find any plugins nor found any code googling around for my Rails app??
Why don't you try it simple just by creating (for example) an rss action that queries the 4 models. After the query is done, you could loop through them 1 by one.