Path resolution change in 1.1.x?

Rails
1

I have a web service api that references a struct in a file in the
models directory. In 1.0, this worked, but in 1.1.0/1 I get undefined
constant messages for the struct unless I put the full path to the
struct in the require in the api file. Has something changed in the load
paths for 1.1.x?

TIA,
Keith