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My non-blocking scala recommender, searching through database for cheaper merchant, scala, slick
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| class Recommender(transactionModel: SasquatchTransactionModel)(implicit ec: ExecutionContext) extends StrictLogging { | |
| def findCheaperMerchant(transaction: SasquatchTransactionDTO): DBRead[Seq[SasquatchRecommendation]] = { | |
| val mId: String = transaction.merchantId | |
| logger.info(s"Computing cheaper merchant for transaction: ${transaction.extId} merchant: ${mId}") | |
| val top10NearestMerchants = transactionModel.nearestNeighbour( | |
| long = transaction.long, | |
| lat = transaction.lat, | |
| category = transaction.category | |
| ) | |
| val isCheaper: (SasquatchTransaction) => Boolean = _.amount.abs < transaction.amount.abs | |
| val notSelf: (SasquatchTransaction) => Boolean = _.merchantId != mId | |
| top10NearestMerchants.flatMap(nearMerchants => { | |
| def getDistance(merchantId: String) = nearMerchants.filter(_.id == merchantId).map(_.distance).headOption | |
| logger.info(s"Found near Merchants: ${nearMerchants.filter(_.id != mId).map(_.id)}") | |
| transactionModel.findByMerchantDistanceInSet(nearMerchants) | |
| .map(_.filter(isCheaper) | |
| .filter(notSelf).flatMap(recommendedTransaction => | |
| for { | |
| mmId <- recommendedTransaction.merchantId | |
| dist <- getDistance(mId) | |
| } yield SasquatchRecommendation(mId, mmId, dist))) | |
| }) | |
| } | |
| } | |
| case class SasquatchTransactionDTO(extId: String, merchantId: String, category: String, long: Float, lat: Float, amount: BigDecimal) |
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