mongodb $exists always returning 0

Question

I have a database collection (named fols) like so:

{\'followers\':
        {
           \'123\':1
           \'123\':2
           \'123\':3
         }
}


        

Answer 1

When you're not matching a complete object you need to use dot notation to use an operator against an embedded object. So in this case:

cursor = fols.find({'followers.123':{'$exists': True}})

Answer 2

Try the dot syntax:

cursor = fols.find({'followers.123': {'$exists': True}})

But also see my comment above. You can't have the same key more than once in a (sub-)document.