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it's not possible to do that. i would recommend either:
a) changing your data model so that all of the data is in a single document (might not be possible depending on your case).
b) querying for users who are 30 first, and then doing a second query to get posts where user is $in that list. i would do this client side rather than using server-side JS or anything like that.
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I use a Python driver, so forgive my not-so-mongodb syntax:
users = list(db.Users.find({'Age':30}))
posts = list(db.Posts.find({'User':{'$in':users}}))
client = MongoClient('ip', 27017)
client.the_database.authenticate('user', 'password', source='db_name')
db = client['db_name']
user = db['user']
user_id = user.find_one({'email': '[email protected]'}).get('_id')
client_user_relation = db['client_user_relation']
print(client_user_relation.find_one())
print(user_id)
print(DBRef(collection = "user", id = user_id))
print(client_user_relation.find_one({'user': DBRef(collection = "user", id = user_id)}))
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