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-rw-r--r--activerecord/lib/active_record/associations/has_many_through_association.rb4
1 files changed, 3 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/associations/has_many_through_association.rb b/activerecord/lib/active_record/associations/has_many_through_association.rb
index 9657cb081d..53d49fef2e 100644
--- a/activerecord/lib/active_record/associations/has_many_through_association.rb
+++ b/activerecord/lib/active_record/associations/has_many_through_association.rb
@@ -73,7 +73,9 @@ module ActiveRecord
# association
def build_through_record(record)
@through_records[record.object_id] ||= begin
- through_record = through_association.build(construct_join_attributes(record))
+ ensure_mutable
+
+ through_record = through_association.build
through_record.send("#{source_reflection.name}=", record)
through_record
end