ask the request if we should show exceptions

hide the env key in the request object so that other code doesn't need
to know.

1 files changed, 7 insertions, 0 deletions

diff --git a/actionpack/lib/action_dispatch/http/request.rb b/actionpack/lib/action_dispatch/http/request.rb
index eeded9ffd0..c18c2643e4 100644
--- a/actionpack/lib/action_dispatch/http/request.rb
+++ b/actionpack/lib/action_dispatch/http/request.rb
@@ -132,6 +132,13 @@ module ActionDispatch
       end
     end
 
+    def show_exceptions? # :nodoc:
+      # We're treating `nil` as "unset", and we want the default setting to be
+      # `true`.  This logic should be extracted to `env_config` and calculated
+      # once.
+      !(env['action_dispatch.show_exceptions'.freeze] == false)
+    end
+
     # Returns a symbol form of the #request_method
     def request_method_symbol
       HTTP_METHOD_LOOKUP[request_method]