LoadError: Expected X to define on gem upgrade

I’m upgrading to the latest version of ActiveAdmin and am running into
the
following when trying to start the app:

Expected …/app/model/store/base.rb to define Base

base.rb defines base like:

module MyApp

class Store::Base

end

end

I’ve done some digging and found that ActiveAdmin did some refactoring
to derive everything from a BaseController. It also depends on another
gem (InheritedResources), which does:

    self.resource_class ||= begin
      namespaced_classes = self.name.sub(/Controller/, 

‘’).split(’::’)
namespaced_class = [namespaced_classes.first,
namespaced_classes.last].join(’::’).singularize
namespaced_class.constantize
rescue NameError
nil
end

From:

So I guess Rails is trying to load the model Base and is wrongly
deciding that my existing base.rb file should take precedence or
something, but since it’s not namespaced to just Base it raises this
error.

How can I fix this? I’ve tried loading the ActiveADmin BaseController
file in application.rb, defining a pseudo Base class deriving from
BaseController, etc., but nothing seems to work.

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