3 files changed, 3 insertions, 3 deletions
diff --git a/activerecord/lib/active_record/validations/absence.rb b/activerecord/lib/active_record/validations/absence.rb
index 2e19e6dc5c..376d743c92 100644
--- a/activerecord/lib/active_record/validations/absence.rb
+++ b/activerecord/lib/active_record/validations/absence.rb
@@ -2,7 +2,7 @@ module ActiveRecord
   module Validations
     class AbsenceValidator < ActiveModel::Validations::AbsenceValidator # :nodoc:
       def validate_each(record, attribute, association_or_value)
-        return unless should_validate?(record)
+        return unless should_validate?(record) || unknown_attribute?(record, attribute)
         if record.class._reflect_on_association(attribute)
           association_or_value = Array.wrap(association_or_value).reject(&:marked_for_destruction?)
         end
diff --git a/activerecord/lib/active_record/validations/length.rb b/activerecord/lib/active_record/validations/length.rb
index 69e048eef1..fe34e4875c 100644
--- a/activerecord/lib/active_record/validations/length.rb
+++ b/activerecord/lib/active_record/validations/length.rb
@@ -2,7 +2,7 @@ module ActiveRecord
   module Validations
     class LengthValidator < ActiveModel::Validations::LengthValidator # :nodoc:
       def validate_each(record, attribute, association_or_value)
-        return unless should_validate?(record) || associations_are_dirty?(record)
+        return unless should_validate?(record) || unknown_attribute?(record, attribute) || associations_are_dirty?(record)
         if association_or_value.respond_to?(:loaded?) && association_or_value.loaded?
           association_or_value = association_or_value.target.reject(&:marked_for_destruction?)
         end
diff --git a/activerecord/lib/active_record/validations/presence.rb b/activerecord/lib/active_record/validations/presence.rb
index 7e85ed43ac..e34d2d70ab 100644
--- a/activerecord/lib/active_record/validations/presence.rb
+++ b/activerecord/lib/active_record/validations/presence.rb
@@ -2,7 +2,7 @@ module ActiveRecord
   module Validations
     class PresenceValidator < ActiveModel::Validations::PresenceValidator # :nodoc:
       def validate_each(record, attribute, association_or_value)
-        return unless should_validate?(record)
+        return unless should_validate?(record) || unknown_attribute?(record, attribute)
         if record.class._reflect_on_association(attribute)
           association_or_value = Array.wrap(association_or_value).reject(&:marked_for_destruction?)
         end