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            return [purchase.to_thrift_object() for purchase in purchases]
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            return [purchase.to_thrift_object() for purchase in purchases]
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        finally:
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        finally:
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            self.close_session()
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            self.close_session()
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    def getPrice(self, purchaseId, itemId):
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    def getPurchaseOrderForPurchase(self, purchaseId):
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        """
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        """
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        Returns the price at which we bought an item from a supplier
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        Returns the purchase order for a given purchase
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        Parameters:
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        Parameters:
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         - purchaseId
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         - purchaseId
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         - itemId
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        """
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        """
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        purchaseOrderId = Purchase.query.filter_by(id = purchaseId).one().purchaseOrder_id
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        po = self.getPurchaseOrder(Purchase.query.filter_by(id = purchaseId).one().purchaseOrder_id)
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        return LineItem.query.filter_by(purchaseOrder_id = purchaseOrderId).filter_by(itemId = itemId).one().unitPrice
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        self.close_session()
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        return po
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    def close_session(self):
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    def close_session(self):
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        if session.is_active:
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        if session.is_active:
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            print "session is active. closing it."
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            print "session is active. closing it."
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            session.close()
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            session.close()