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August 29, 2015 14:15
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| trans_ids = transactions.all.inject({}) do |hash, trx| | |
| if hash[trx.mid_id].nil? | |
| hash[trx.mid_id] = [] | |
| end | |
| hash[trx.mid_id].push trx.id | |
| end | |
| PP.pp trans_ids | |
| //output is | |
| [8] |
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