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-rw-r--r--activerecord/lib/active_record/associations/builder/collection_association.rb3
1 files changed, 2 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/associations/builder/collection_association.rb b/activerecord/lib/active_record/associations/builder/collection_association.rb
index fcdfc1e150..fdead16761 100644
--- a/activerecord/lib/active_record/associations/builder/collection_association.rb
+++ b/activerecord/lib/active_record/associations/builder/collection_association.rb
@@ -6,7 +6,8 @@ module ActiveRecord::Associations::Builder
CALLBACKS = [:before_add, :after_add, :before_remove, :after_remove]
def valid_options
- super + [:table_name, :finder_sql, :counter_sql, :before_add, :after_add, :before_remove, :after_remove]
+ super + [:table_name, :finder_sql, :counter_sql, :before_add,
+ :after_add, :before_remove, :after_remove, :extend]
end
attr_reader :block_extension, :extension_module