3 files changed, 12 insertions, 2 deletions
diff --git a/activerecord/lib/active_record/associations/collection_proxy.rb b/activerecord/lib/active_record/associations/collection_proxy.rb
index ad029d1101..50d16b16a9 100644
--- a/activerecord/lib/active_record/associations/collection_proxy.rb
+++ b/activerecord/lib/active_record/associations/collection_proxy.rb
@@ -81,7 +81,7 @@ module ActiveRecord
       def method_missing(method, *args, &block)
         match = DynamicFinderMatch.match(method)
         if match && match.instantiator?
-          send(:find_or_instantiator_by_attributes, match, match.attribute_names, *args) do |r|
+          scoped.send(:find_or_instantiator_by_attributes, match, match.attribute_names, *args) do |r|
             proxy_association.send :set_owner_attributes, r
             proxy_association.send :add_to_target, r
             yield(r) if block_given?
@@ -101,7 +101,7 @@ module ActiveRecord
           end
 
         else
-          scoped.readonly(nil).send(method, *args, &block)
+          scoped.readonly(nil).public_send(method, *args, &block)
         end
       end
 
diff --git a/activerecord/test/cases/associations/has_many_associations_test.rb b/activerecord/test/cases/associations/has_many_associations_test.rb
index a98e5b115c..f74fe42dc2 100644
--- a/activerecord/test/cases/associations/has_many_associations_test.rb
+++ b/activerecord/test/cases/associations/has_many_associations_test.rb
@@ -1703,4 +1703,9 @@ class HasManyAssociationsTest < ActiveRecord::TestCase
   ensure
     ActiveRecord::Base.dependent_restrict_raises = option_before
   end
+
+  def test_collection_association_with_private_kernel_method
+    firm = companies(:first_firm)
+    assert_equal [accounts(:signals37)], firm.accounts.open
+  end
 end
diff --git a/activerecord/test/models/company.rb b/activerecord/test/models/company.rb
index fbdfaa2c29..7b993d5a2c 100644
--- a/activerecord/test/models/company.rb
+++ b/activerecord/test/models/company.rb
@@ -198,6 +198,11 @@ class Account < ActiveRecord::Base
     @destroyed_account_ids ||= Hash.new { |h,k| h[k] = [] }
   end
 
+  # Test private kernel method through collection proxy using has_many.
+  def self.open
+    where('firm_name = ?', '37signals')
+  end
+
   before_destroy do |account|
     if account.firm
       Account.destroyed_account_ids[account.firm.id] << account.id