Quick tip: Don’t be dumb and assume Ruby’s URI.join is like
Array.join. I made a seemingly innocent change to add some new
functionality to an old API:
URI.join("http://example.com", "/admin/important_base", "/some_endpoint_argument")
I expected this:
http://example.com/admin/important_base/some_endpoint_argument
but I got this instead:
http://example.com/admin/some_endpoint_argument
Options
File.join gives the closest functionality, as far as handling as
slashes intelligently:
File.join("http://example.com", "/admin/important_base/", "/some_endpoint_argument")
#=> "http://example.com/admin/important_base/some_endpoint_argument"
URI(_)
#=> #<URI::HTTP http://example.com/admin/important_base/some_endpoint_argument>
The other obvious candidates – Array.join or string concatenation –
require managing forward-slashes, which is what I was hoping to avoid
in the first place.