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fix merging the targer lists in 1.8. #1425

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@@ -402,9 +402,8 @@ def merge_target_lists(persisted, memory)
return memory if persisted.empty?
persisted.map! do |record|
- mem_record = memory.delete(record)
- if mem_record
+ if mem_id = memory.index(record)
+ mem_record = memory.delete_at(mem_id)
(record.attribute_names - mem_record.changes.keys).each do |name|
mem_record[name] = record[name]