Sinatra: Incorrect rack requirement for showexceptions file

[djsegal]

---

I was getting this error when booting up my rails app:

activesupport/lib/active_support/dependencies.rb:302:in `require': 
    cannot load such file -- rack/showexceptions (LoadError)

---

• The error was addressed in the issue:
  
  
  
  • https://github.com/rack/rack/issues/978#issuecomment-165690896
  
  
• And can be fixed by requiring the correct (new) show_exception file inside sinatra.
  
  
  
  • there was a rename from showexception to show_exception
  
  

---

[djsegal]

This was a problem with an out of date rack version.

Resolved by: https://github.com/sinatra/sinatra/pull/1033

[sgringwe]

@djsegal what is the planned merge and release for #1033? Is there an immediate solution for this error?

[jaredbeck]

Are there any plans to backport this fix to 1.4? Potentially an easy backport, and would allow 1.4 users to run on rack 2.

[kytrinyx]

I'd be happy to backport this. @zzak @TrevorBramble @ashleygwilliams @kgrz -- any objections?

[kgrz]

I'm worried about the changed Rack::File API/usage in Rack 2.x. It might break Sinatra 1.4.x's use of Rack::File. #1045 uses the newer API, but including that for 1.4.x would be a breaking change.

[kytrinyx]

Ah, yes, you're right. If we do back-port this, we'd also need to back-port the changes you made in #1045. It doesn't look like the 1045 PR changes the public API of Sinatra itself, so at first blush that seems like it could work. Am I missing anything else here?

[TrevorBramble]

Given the known details I think backporting is the right thing.
On Jan 5, 2016 6:13 AM, "Katrina Owen" [email protected] wrote:

Ah, yes, you're right. If we do back-port this, we'd also need to
back-port the changes you made in #1045
https://github.com/sinatra/sinatra/pull/1045. It doesn't look like the
1045 PR changes the public API of Sinatra itself, so at first blush that
seems like it could work. Am I missing anything else here?

—
Reply to this email directly or view it on GitHub
https://github.com/sinatra/sinatra/issues/1055#issuecomment-169011529.

[kytrinyx]

OK, cool. I'll assign this one to myself.

[kytrinyx]

I've taken another look at this. The idea would be to only support rack 2.0, right?

[zzak]

I think supporting Rack 2.0 only is the easiest way to move forward

[kytrinyx]

Yeah, I think so to. I'm going to un-assign this. At first blush there's a little bit more work that needs to go into this than just cherry-picking the commits in question.

[zzak]

This should be fixed.

[jaredbeck]

This should be fixed.

It is fixed by https://github.com/sinatra/sinatra/commit/5993492eccfda74c3cc60760073a4b037662f5d3 in 1.4.7, right? Thanks!

[MichaelCPell]

Confirming that I solved this by adding gem 'sinatra', '2.0.0.beta2' to gemfile.

[jordanmichaelrushing]

If you're using grape, there's a conflict using 2.0.0.beta2 as it depends on 'mustermann', '1.0.0.beta2' which grape 0.19.2 (highest current version) depends on mustermann (~> 1.0.0):

Bundler could not find compatible versions for gem "mustermann":
  In Gemfile:
    mustermann (= 1.0.0.beta2)

    grape was resolved to 0.19.2, which depends on
      mustermann-grape (~> 1.0.0) was resolved to 1.0.0, which depends on
        mustermann (~> 1.0.0)

[mwpastore]

@rushingfitness Try '2.0.0.rc2' (or '>= 2.0.0.beta2', '< 3') instead.

[jordanmichaelrushing]

@mwpastore I could kiss ya! Thanks man, don't know how I missed the rc's :)