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-rw-r--r--activesupport/lib/active_support/core_ext/module/delegation.rb6
1 files changed, 6 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/core_ext/module/delegation.rb b/activesupport/lib/active_support/core_ext/module/delegation.rb
index 54271a3970..14d7f0c484 100644
--- a/activesupport/lib/active_support/core_ext/module/delegation.rb
+++ b/activesupport/lib/active_support/core_ext/module/delegation.rb
@@ -276,6 +276,11 @@ class Module
# The delegated method must be public on the target, otherwise it will
# raise +DelegationError+. If you wish to instead return +nil+,
# use the <tt>:allow_nil</tt> option.
+ #
+ # The <tt>marshal_dump</tt> and <tt>_dump</tt> methods are exempt from
+ # delegation due to possible interference when calling
+ # <tt>Marshal.dump(object)</tt>, should the delegation target method
+ # of <tt>object</tt> add or remove instance variables.
def delegate_missing_to(target, allow_nil: nil)
target = target.to_s
target = "self.#{target}" if DELEGATION_RESERVED_METHOD_NAMES.include?(target)
@@ -285,6 +290,7 @@ class Module
# It may look like an oversight, but we deliberately do not pass
# +include_private+, because they do not get delegated.
+ return false if name == :marshal_dump || name == :_dump
#{target}.respond_to?(name) || super
end