how to store a complex object in redis (using redis-py)

python redis
yuan picture yuan · Mar 5, 2013 · Viewed 84.2k times · Source

The hmset function can set the value of each field, but I found that if the value itself is a complex structured object, the value return from hget is a serialized string, not the original object

e.g

images= [{'type':'big', 'url':'....'},
     {'type':'big', 'url':'....'},
     {'type':'big', 'url':'....'}]   

redis = Redis()
redis.hset('photo:1', 'images', images)

i = redis.hget('photo:1', 'images')
print type(i)

the type of i is a string, not a python object, is there any way to solve this problem besides manually parse each fields?

Answer

Kyrylo Perevozchikov picture Kyrylo Perevozchikov · Dec 5, 2013

Actually, you can store python objects in redis using the built-in module pickle.

Here is example.

import pickle
import redis

r = redis.StrictRedis(host='localhost', port=6379, db=0)
obj = ExampleObject()
pickled_object = pickle.dumps(obj)
r.set('some_key', pickled_object)
unpacked_object = pickle.loads(r.get('some_key'))
obj == unpacked_object

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