Remove non-existing middleware

[coorasse]

Am I missing something? This middleware does not exist and therefore cannot be loaded.
It should be here, right? https://github.com/solidusio/solidus/tree/master/backend/lib/spree/backend
On the other side, the Frontend one is present: https://github.com/solidusio/solidus/tree/master/frontend/lib/spree/frontend/middleware

This instruction makes the installation of solidus_backend fail. 😢

[kennyadsl]

Hey @coorasse, thanks for this PR. It's quite creepy that we had this middleware call there but the system was not complaining. Which error are you seeing exactly?

[coorasse]

NoMethodError:
            undefined method `new' for "Spree::Backend::Middleware::SeoAssist":String

I can create a gist later if needed.
And if I change it to the class, instead of the string, it cannot find it.
I find this also pretty creepy...I couldn't really understand it, and also I didn't put too much effort into trying to understand it since this class really does not exist.

[kennyadsl]

Does it happen when you start the rails server on your own host application? And, are you requiring the main gem 'solidus' or via individual sub-components (solidus_backend, solidus_core)?

[coorasse]

Individual subcomponents. solidus_backend and solidus_core.
I am currently investigating, it could be related to:

mount Spree::Core::Engine, at: '/'
mount Spree::Backend::Engine, at: '/'

?

[coorasse]

git clone [email protected]:renuo/solidus_engine_issue.git
cd solidus_engine_issue
bin/setup
bundle exec rake
cat log/test.log

[kennyadsl]

Probably unrelated, there's no need to mount backend routes manually. They are injected into the Spree::Core routes.

This makes me think that maybe we never call Spree::Backend::Engine in the whole application and, being not loaded or accessed, it never crashes.