I came across this little annoyance(?!) while upgrading a project from 1.1.6 to Edge Rails.
I was trying to add a resource mapping for my Post model.
I did as instructed and added...
...to config/routes.rb. What I didn't pay much attention to was that I added the command to the very end of the file (before the 'end' keyword of course; I am not that thick!).
Anyway, everything seemed to work fine until I tried a CRUD operation other than the '/posts' index action. I started getting strange 'Unknown Action 2' messages.
Well, it took me a couple hours to figure it out; any mapped resources must be added *before* these two lines in routes.rb:
# Install the default route as the lowest priority.
I haven't had a chance to investigate if this is a routing bug (the code looks a tad scary!). Or maybe it is just a vague point in the documentation (i.e. routes.rb comments)
I fear this little detail might get in the way of a lot of people who are eager to jump into REST, and might not spend enough time to read the comments, even if they are in front of them.
Before REST it might not have been an issue as simple apps never touched routes.rb. Now though...