stop exposing the exception class

actionpack/lib/action_dispatch/middleware/debug_exceptions.rb

@@ -139,7 +139,7 @@ def log_error(request, wrapper)
 
         message = []
         message << "  "
-        message << "#{wrapper.exception_class} (#{wrapper.message}):"
+        message << "#{wrapper.exception_class_name} (#{wrapper.message}):"
         message.concat(wrapper.annotated_source_code)
         message << "  "
         message.concat(trace)

actionpack/lib/action_dispatch/middleware/exception_wrapper.rb

@@ -41,7 +41,7 @@ class ExceptionWrapper
       "ActionDispatch::Http::MimeNegotiation::InvalidType"
     ]
 
-    attr_reader :backtrace_cleaner, :wrapped_causes
+    attr_reader :backtrace_cleaner, :wrapped_causes, :exception_class_name
 
     def initialize(backtrace_cleaner, exception)
       @backtrace_cleaner = backtrace_cleaner
@@ -72,10 +72,6 @@ def failures
       @exception.failures
     end
 
-    def exception_class
-      @exception.class
-    end
-
     def has_corrections?
       @exception.respond_to?(:original_message) && @exception.respond_to?(:corrections)
     end

actionpack/lib/action_dispatch/middleware/templates/rescues/_actions.html.erb

@@ -4,7 +4,7 @@
   <div class="actions">
     <% actions.each do |action, _| %>
       <%= button_to action, ActionDispatch::ActionableExceptions.endpoint, params: {
-        error: exception_wrapper.exception_class.name,
+        error: exception_wrapper.exception_class_name,
         action: action,
         location: request.path
       } %>

actionpack/lib/action_dispatch/middleware/templates/rescues/diagnostics.html.erb

@@ -1,6 +1,6 @@
 <header>
   <h1>
-    <%= @exception_wrapper.exception_class.to_s %>
+    <%= @exception_wrapper.exception_class_name %>
     <% if params_valid? && @request.parameters['controller'] %>
       in <%= @request.parameters['controller'].camelize %>Controller<% if @request.parameters['action'] %>#<%= @request.parameters['action'] %><% end %>
     <% end %>
@@ -21,7 +21,7 @@
   <% @exception_wrapper.wrapped_causes.each.with_index(1) do |wrapper, index| %>
     <div class="details">
       <a class="summary" href="#" onclick="return toggle(<%= wrapper.exception_id %>)">
-        <%= wrapper.exception_class.name %>: <%= h wrapper.message %>
+        <%= wrapper.exception_class_name %>: <%= h wrapper.message %>
       </a>
     </div>
 

actionpack/lib/action_dispatch/middleware/templates/rescues/diagnostics.text.erb

@@ -1,4 +1,4 @@
-<%= @exception_wrapper.exception_class.to_s %><%
+<%= @exception_wrapper.exception_class_name %><%
   if params_valid? && @request.parameters['controller']
 %> in <%= @request.parameters['controller'].camelize %>Controller<% if @request.parameters['action'] %>#<%= @request.parameters['action'] %><% end %>
 <% end %>