Use symbol of mime type instead of object to get correct parser

After registering new `:json` mime type `parsers.fetch` can't find the mime type because new mime type is not equal to old one. Using symbol of the mime type as key on parsers hash solves the problem.

Closes #23766

2 files changed, 4 insertions, 4 deletions

diff --git a/actionpack/lib/action_controller/test_case.rb b/actionpack/lib/action_controller/test_case.rb
index 0c4b661214..700317614f 100644
--- a/actionpack/lib/action_controller/test_case.rb
+++ b/actionpack/lib/action_controller/test_case.rb
@@ -52,7 +52,7 @@ module ActionController
       self.session = session
       self.session_options = TestSession::DEFAULT_OPTIONS
       @custom_param_parsers = {
-        Mime[:xml] => lambda { |raw_post| Hash.from_xml(raw_post)['hash'] }
+        xml: lambda { |raw_post| Hash.from_xml(raw_post)['hash'] }
       }
     end
 
@@ -105,7 +105,7 @@ module ActionController
           when :url_encoded_form
             data = non_path_parameters.to_query
           else
-            @custom_param_parsers[content_mime_type] = ->(_) { non_path_parameters }
+            @custom_param_parsers[content_mime_type.symbol] = ->(_) { non_path_parameters }
             data = non_path_parameters.to_query
           end
         end
diff --git a/actionpack/lib/action_dispatch/http/parameters.rb b/actionpack/lib/action_dispatch/http/parameters.rb
index cca7376ffa..bcb818d38c 100644
--- a/actionpack/lib/action_dispatch/http/parameters.rb
+++ b/actionpack/lib/action_dispatch/http/parameters.rb
@@ -4,7 +4,7 @@ module ActionDispatch
       PARAMETERS_KEY = 'action_dispatch.request.path_parameters'
 
       DEFAULT_PARSERS = {
-        Mime[:json] => lambda { |raw_post|
+        Mime[:json].symbol => -> (raw_post) {
           data = ActiveSupport::JSON.decode(raw_post)
           data.is_a?(Hash) ? data : {:_json => data}
         }
@@ -51,7 +51,7 @@ module ActionDispatch
       def parse_formatted_parameters(parsers)
         return yield if content_length.zero?
 
-        strategy = parsers.fetch(content_mime_type) { return yield }
+        strategy = parsers.fetch(content_mime_type.symbol) { return yield }
 
         begin
           strategy.call(raw_post)