I can't find an exhaustive answer.
What happens if I set "production"? I saw that view files are not read "on the fly" anymore, but are there other differences?
Basically, only templates are affected by the env var.
You are free to implement every other application logic methods based on current env:
if settings.production?
# this will only run in production
else
# every other env
end
You can also do something like this when need conditional configs:
configure :production, :development do
enable :logging
end