How to write match condition for array values?

Question

I have stored values in multiple variables. below are the input variables.

uid = Objectid(\"5d518caed55bc00001d235c1\")
disuid = [\'5d76b2c847c8d3000184a090\', \         


        

Answer 1

Ok you can do it in two ways :

As you've this :

uid = Objectid("5d518caed55bc00001d235c1")
disuid = ['5d76b2c847c8d3000184a090', '5d7abb7a97a90b0001326010']

You need to convert your list of strings to list of ObjectId's using python code :

from bson.objectid import ObjectId


disuid = ['5d76b2c847c8d3000184a090', '5d7abb7a97a90b0001326010']
my_list = []


for i in disuid:
    my_list.append(ObjectId(i))

It will look like this : [ObjectId('5d76b2c847c8d3000184a090'),ObjectId('5d7abb7a97a90b0001326010')]

then by using new list my_list, you can do query like this :

user_posts.aggregate([{"$match" : { "$or" : [{ "userid" : uid }, { "userid" : { "$in" : my_list }}]}}])

Or in the other way which I wouldn't prefer, as converting just few in code is easier compared to n num of values for userid field over all documents in DB, but just in case if you want it to be done using DB query :

user_posts.aggregate([{$addFields : {userStrings : {$toString: '$userid'}}},{"$match" : { "$or" : [{ "userid" : uid }, { "userStrings" : { "$in" : disuid }}]}}])

Note : In case if you don't have bson package, then you need to install it by doing something like pip install bson