Freeze modifications to ActiveRecord::QueryLogs

actionpack/lib/action_controller/railtie.rb

@@ -123,7 +123,7 @@ class Railtie < Rails::Railtie # :nodoc:
         app.config.active_record.query_log_tags |= [:action]
 
         ActiveSupport.on_load(:active_record) do
-          ActiveRecord::QueryLogs.taggings.merge!(
+          ActiveRecord::QueryLogs.taggings = ActiveRecord::QueryLogs.taggings.merge(
             controller:            ->(context) { context[:controller]&.controller_name },
             action:                ->(context) { context[:controller]&.action_name },
             namespaced_controller: ->(context) {

activejob/lib/active_job/railtie.rb

@@ -93,7 +93,9 @@ class Railtie < Rails::Railtie # :nodoc:
         app.config.active_record.query_log_tags |= [:job]
 
         ActiveSupport.on_load(:active_record) do
-          ActiveRecord::QueryLogs.taggings[:job] = ->(context) { context[:job].class.name if context[:job] }
+          ActiveRecord::QueryLogs.taggings = ActiveRecord::QueryLogs.taggings.merge(
+            job: ->(context) { context[:job].class.name if context[:job] }
+          )
         end
       end
     end

activerecord/lib/active_record/query_logs.rb

@@ -102,8 +102,8 @@ def call(_context)
       end
     end
 
-    @taggings = {}
-    @tags = [ :application ]
+    @taggings = {}.freeze
+    @tags = [ :application ].freeze
     @prepend_comment = false
     @cache_query_log_tags = false
     @tags_formatter = false
@@ -115,17 +115,16 @@ class << self
       attr_accessor :prepend_comment, :cache_query_log_tags # :nodoc:
 
       def taggings=(taggings) # :nodoc:
-        @taggings = taggings
+        @taggings = taggings.freeze
         @handlers = rebuild_handlers
       end
 
       def tags=(tags) # :nodoc:
-        @tags = tags
+        @tags = tags.freeze
         @handlers = rebuild_handlers
       end
 
       def tags_formatter=(format) # :nodoc:
-        @tags_formatter = format
         @formatter = case format
         when :legacy
           LegacyFormatter
@@ -134,6 +133,7 @@ def tags_formatter=(format) # :nodoc:
         else
           raise ArgumentError, "Formatter is unsupported: #{format}"
         end
+        @tags_formatter = format
       end
 
       def call(sql, connection) # :nodoc:

activerecord/lib/active_record/railtie.rb

@@ -385,7 +385,7 @@ class Railtie < Rails::Railtie # :nodoc:
       config.after_initialize do
         if app.config.active_record.query_log_tags_enabled
           ActiveRecord.query_transformers << ActiveRecord::QueryLogs
-          ActiveRecord::QueryLogs.taggings.merge!(
+          ActiveRecord::QueryLogs.taggings = ActiveRecord::QueryLogs.taggings.merge(
             application:  Rails.application.class.name.split("::").first,
             pid:          -> { Process.pid.to_s },
             socket:       ->(context) { context[:connection].pool.db_config.socket },

activerecord/test/cases/query_logs_test.rb

@@ -20,8 +20,8 @@ def setup
     ActiveRecord::QueryLogs.prepend_comment = false
     ActiveRecord::QueryLogs.cache_query_log_tags = false
     ActiveRecord::QueryLogs.cached_comment = nil
-    ActiveRecord::QueryLogs.taggings[:application] = -> {
-      "active_record"
+    ActiveRecord::QueryLogs.taggings = {
+      application: -> { "active_record" }
     }
   end
 
@@ -185,7 +185,7 @@ def test_empty_comments_are_not_added
 
   def test_sql_commenter_format
     ActiveRecord::QueryLogs.tags_formatter = :sqlcommenter
-    ActiveRecord::QueryLogs.tags = [:application, {}]
+    ActiveRecord::QueryLogs.tags = [:application]
 
     assert_queries_match(%r{/\*application='active_record'\*/}) do
       Dashboard.first