Add Deprecators#disallowed_warnings=

activesupport/lib/active_support/deprecation/deprecators.rb

@@ -69,6 +69,14 @@ def disallowed_behavior=(disallowed_behavior)
         set_option(:disallowed_behavior, disallowed_behavior)
       end
 
+      # Sets the disallowed deprecation warnings for all deprecators in this
+      # collection.
+      #
+      # See ActiveSupport::Deprecation::Disallowed#disallowed_warnings=.
+      def disallowed_warnings=(disallowed_warnings)
+        set_option(:disallowed_warnings, disallowed_warnings)
+      end
+
       # Silences all deprecators in this collection for the duration of the
       # given block.
       #

activesupport/lib/active_support/railtie.rb

@@ -88,9 +88,7 @@ class Railtie < Rails::Railtie # :nodoc:
         end
 
         if disallowed_warnings = app.config.active_support.disallowed_deprecation_warnings
-          app.deprecators.each do |deprecator|
-            deprecator.disallowed_warnings = disallowed_warnings
-          end
+          app.deprecators.disallowed_warnings = disallowed_warnings
         end
       end
     end

activesupport/test/deprecation/deprecators_test.rb

@@ -63,6 +63,11 @@ class DeprecationTest < ActiveSupport::TestCase
     @deprecators.each { |deprecator| assert_equal [callback], deprecator.disallowed_behavior }
   end
 
+  test "#disallowed_warnings= applies to each deprecator" do
+    @deprecators.disallowed_warnings = :all
+    @deprecators.each { |deprecator| assert_equal :all, deprecator.disallowed_warnings }
+  end
+
   test "#silence silences each deprecator" do
     @deprecators.each { |deprecator| assert_not_silencing(deprecator) }