Merge pull request #311 from crobbo/fix-rails-8.2-debug-exceptions

Fix Rails 8.2 compatibility for debug_exceptions patch

Author: bknoles

lib/patches/debug_exceptions.rb

@@ -5,18 +5,22 @@
 # The original source needs to be patched, so that Inertia requests are
 # NOT responded with plain text, but with HTML.
 #
-# Original source (unchanged since Rails 5.1):
-# https://github.com/rails/rails/blob/5-1-stable/actionpack/lib/action_dispatch/middleware/debug_exceptions.rb
+# Original source:
 # https://github.com/rails/rails/blob/8-0-stable/actionpack/lib/action_dispatch/middleware/debug_exceptions.rb
+# https://github.com/rails/rails/blob/main/actionpack/lib/action_dispatch/middleware/debug_exceptions.rb
 #
 
 module InertiaRails
   module InertiaDebugExceptions
-    def render_for_browser_request(request, wrapper)
+    # Rails 8.2+ passes content_type as third argument
+    def render_for_browser_request(request, wrapper, content_type = nil)
       template = create_template(request, wrapper)
       file = "rescues/#{wrapper.rescue_template}"
 
-      if request.xhr? && !request.headers['X-Inertia'] # <<<< this line is changed only
+      if content_type == Mime[:md]
+        body = template.render(template: file, layout: false, formats: [:text])
+        format = 'text/markdown'
+      elsif request.xhr? && !request.headers['X-Inertia']
         body = template.render(template: file, layout: false, formats: [:text])
         format = 'text/plain'
       else