I'm designing a 'disposable app' for keeping a log of things. Let's say I have a model 'user' that has many 'posts' and let's say there are 'topics' that have many 'posts'. Now, I'd like to be able to have URLs like
app/[user_name] which will have all the stuff related to the user
app/[topic_name] that will have all the items in that topic.
What's a good place to start reading about what I need to know? I don't want to know the solution (yet) but just want to know what I should read to understand this area of work.