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- irb(main):044:0> A.find(219).bs.map(&:container_b_id)
- => [nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, 2330, nil, 2330, 2330, 2330, 2330, 2330, 2330, 2330, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil]
- irb(main):045:0> A.find(219).bs.where('container_b_id = ?', nil)
- => #<ActiveRecord::AssociationRelation []>
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