Get rid of the unused ActiveRecord::Base.sqlite3_production_warning

activerecord/lib/active_record/core.rb

@@ -138,8 +138,6 @@ module ActiveRecord
 
       class_attribute :has_many_inversing, instance_accessor: false, default: false
 
-      mattr_accessor :sqlite3_production_warning, instance_accessor: false, default: true
-
       class_attribute :default_connection_handler, instance_writer: false
 
       class_attribute :default_role, instance_writer: false

activerecord/lib/active_record/railtie.rb

@@ -198,6 +198,17 @@ To keep using the current cache store, you can turn off cache versioning entirel
       end
     end
 
+
+    SQLITE3_PRODUCTION_WARN = "You are running SQLite in production, this is generally not recommended."\
+      " You can disable this warning by setting \"config.active_record.sqlite3_production_warning=false\"."
+    initializer "active_record.sqlite3_production_warning" do
+      if config.active_record.delete(:sqlite3_production_warning) && Rails.env.production?
+        ActiveSupport.on_load(:active_record_sqlite3adapter) do
+          Rails.logger.warn(SQLITE3_PRODUCTION_WARN)
+        end
+      end
+    end
+
     initializer "active_record.set_configs" do |app|
       configs = app.config.active_record
 
@@ -232,16 +243,6 @@ To keep using the current cache store, you can turn off cache versioning entirel
       end
     end
 
-    SQLITE3_PRODUCTION_WARN = "You are running SQLite in production, this is generally not recommended."\
-      " You can disable this warning by setting \"config.active_record.sqlite3_production_warning=false\"."
-    initializer "active_record.sqlite3_production_warning" do
-      if config.active_record.sqlite3_production_warning && Rails.env.production?
-        ActiveSupport.on_load(:active_record_sqlite3adapter) do
-          Rails.logger.warn(SQLITE3_PRODUCTION_WARN)
-        end
-      end
-    end
-
     # Expose database runtime to controller for logging.
     initializer "active_record.log_runtime" do
       require "active_record/railties/controller_runtime"

railties/test/application/configuration_test.rb

@@ -3142,14 +3142,6 @@ module ApplicationTests
       assert_equal false, ActionDispatch::Request.return_only_media_type_on_content_type
     end
 
-    test "config.active_record.sqlite3_production_warning is on by default for new apps" do
-      restore_sqlite3_warning
-
-      app "development"
-
-      assert_equal true, ActiveRecord::Base.sqlite3_production_warning
-    end
-
     test "logs a warning when running SQLite3 in production" do
       restore_sqlite3_warning
       app_file "config/initializers/active_record.rb", <<~RUBY