Pass the view paths as array to ActionView::Base.new

Rails 6 can't handle Rails::Root::Path itself

src/api/app/mixins/can_render_model.rb

@@ -3,7 +3,7 @@
 # and use my_model to access the model instead of self
 module CanRenderModel
   def render_xml(locals = {})
-    action_view = ActionView::Base.new(Rails.configuration.paths['app/views'])
+    action_view = ActionView::Base.new(Rails.configuration.paths['app/views'].to_ary)
     locals[:my_model] = self
     action_view.render partial: "models/#{self.class.name.underscore}", formats: [:xml],
                        locals: locals