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recommender.py
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recommender.py
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import os
import redis
from apps.product.models import get_product_by_id
r = redis.Redis(host=os.environ.get('REDIS_HOST'),
port=os.environ.get('REDIS_PORT'),
db=os.environ.get('REDIS_DB'))
class Recommender:
def __init__(self, product_ids):
self.product_ids = product_ids
def get_product_key(self, id):
return f'product:{id}:purchased_with'
def products_bought(self):
for product_id in self.product_ids:
for with_id in self.product_ids:
if product_id != with_id:
r.zincrby(self.get_product_key(product_id), 1, with_id)
async def suggest_products_for(self, max_results=6):
if len(self.product_ids) == 1:
suggestions = r.zrange(
self.get_product_key(self.product_ids[0]),
0, -1, desc=True)[:max_results]
else:
flat_ids = ''.join([_id for _id in self.product_ids])
tmp_key = f'tmp_{flat_ids}'
product_keys = [self.get_product_key(id) for id in self.product_ids]
r.zunionstore(tmp_key, product_keys)
r.zrem(tmp_key, *self.product_ids)
suggestions = r.zrange(tmp_key, 0, -1, desc=True)[:max_results]
r.delete(tmp_key)
suggested_products = [await get_product_by_id(_id.decode()) for _id in suggestions]
return suggested_products