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-rw-r--r--activerecord/lib/active_record/association_preload.rb5
1 files changed, 1 insertions, 4 deletions
diff --git a/activerecord/lib/active_record/association_preload.rb b/activerecord/lib/active_record/association_preload.rb
index ab7515ab5a..f1aa87ef1f 100644
--- a/activerecord/lib/active_record/association_preload.rb
+++ b/activerecord/lib/active_record/association_preload.rb
@@ -317,10 +317,7 @@ module ActiveRecord
id_map = {}
records.each do |record|
key = record.send(primary_key_name)
- if key
- mapped_records = (id_map[key.to_s] ||= [])
- mapped_records << record
- end
+ (id_map[key.to_s] ||= []) << record if key
end
klasses_and_ids = [[reflection.klass.name, id_map]]
end