slim: Slim 5 no longer working with Middleman: "NameError: uninitialized constant #::ActionView"

I tried using Slim 5 with Middleman and got an error when I visited a page (not when Middleman boots, but when it attempts to render a template).

Slim 4 works fine.

$ bundle exec middleman
== The Middleman is loading
== View your site at "http://192.168.0.113:4567"
== Inspect your site configuration at "http://192.168.0.113:4567/__middleman"
# (At this point I visit a page)
NameError: uninitialized constant #<Class:0x0000000106bf2320>::ActionView
        /Users/henrik/Projects/henrik.nyh.se/source/uses.html.slim:1:in `__tilt_7340'
        /Users/henrik/.asdf/installs/ruby/3.1.2/lib/ruby/gems/3.1.0/gems/tilt-2.0.11/lib/tilt/template.rb:181:in `call'
        /Users/henrik/.asdf/installs/ruby/3.1.2/lib/ruby/gems/3.1.0/gems/tilt-2.0.11/lib/tilt/template.rb:181:in `evaluate'
        /Users/henrik/.asdf/installs/ruby/3.1.2/lib/ruby/gems/3.1.0/gems/tilt-2.0.11/lib/tilt/template.rb:109:in `render'
        /Users/henrik/.asdf/installs/ruby/3.1.2/lib/ruby/gems/3.1.0/gems/middleman-core-4.4.3/lib/middleman-core/renderers/slim.rb:6:in `render'
        /Users/henrik/.asdf/installs/ruby/3.1.2/lib/ruby/gems/3.1.0/gems/padrino-helpers-0.15.2/lib/padrino/rendering.rb:17:in `render'
        /Users/henrik/.asdf/installs/ruby/3.1.2/lib/ruby/gems/3.1.0/gems/middleman-core-4.4.3/lib/middleman-core/file_renderer.rb:79:in `render'
…

Repo branch with Slim 5
Diff showing exact Gems changed (Slim and Temple)
Gemfile
Gemfile.lock

About this issue

Original URL
State: closed
Created a year ago
Reactions: 1
Comments: 20 (13 by maintainers)

Commits related to this issue

Add Slim 5.x compatibility Middleman requires ActionView to be present to render Slim templates. Without this we get a when rendering a template after upgrading to Slim 5. There's a bunch of discus... — committed to substancelab/substancelab-website by koppen 8 months ago

Most upvoted comments

Looks like https://github.com/middleman/middleman/issues/2619 is the appropriate place to continue the discussion?

dentarg on Mar 18, 2023

Isn’t it possible to solve it rather than documenting it? It is very rare that users are requested to “bring their own indirect dependencies”, especially when it will not work without them.

DannyBen on Mar 18, 2023

@DannyBen

Isn’t it possible to solve it rather than documenting it? It is very rare that users are requested to “bring their own indirect dependencies”, especially when it will not work without them.

Slim doesn’t depend on Rails, but provides integration. We cannot depend on it here. If you want to solve the dependency issue, it must be done in Middleman.

minad on Mar 18, 2023

Maybe let middleman choose a buffer type based on whether rails is available or not?

I agree. Why does middleman depend on rails in the first place? That makes no sense to me.

bostonaholic on Feb 26, 2023