Question

I have a collection like this:

user_id     albums
1           [1 2 3 4]
2           [3 5 7 8]

I want to find out all the records that, the albums contains 3 or 7 or 8, I wrote the code like this but not working:

or_array = []
or_array.append({"albums":3})
or_array.append({"albums":7})
or_array.append({"albums":8})

collection1.find({"$or":or_array})

What is the right way to do this?

Answer 1

try this

collection1.find({'albums': {'$in': [3, 7, 8]}})

from the mongodb docs, [IN] allow[s] you to specify an array of possible matches

If that doesn’t work, maybe back track and look at the actual types of 3 7 and 8 in the collection to ensure they are ints.

print type(collection1.find_one()['albums'][0])