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-rw-r--r--activerecord/lib/active_record/reflection.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/reflection.rb b/activerecord/lib/active_record/reflection.rb
index e88c5d17cb..bce7766501 100644
--- a/activerecord/lib/active_record/reflection.rb
+++ b/activerecord/lib/active_record/reflection.rb
@@ -574,7 +574,7 @@ module ActiveRecord
# Add to it the scope from this reflection (if any)
scope_chain.first << scope if scope
- through_scope_chain = through_reflection.scope_chain
+ through_scope_chain = through_reflection.scope_chain.map(&:dup)
if options[:source_type]
through_scope_chain.first <<