Select fields in mongoose query where field value not equal to something - node.js

Question

I am basically trying to update a document and then select the fields from the result where the field value is not equal to something. Assume jwt_id to be b816cf00e9f649fbaf613e2ca2d523b5.
Query
const removeDevices = await Identity.findOneAndUpdate(
{
userID: user_id
},
{
$pull: {
activeTokens: {
jti: {
$ne: jwt_id
}
}
}
},
).select(["-_id", "activeTokens.jti"]);
Now, running this query gives the following output:
{ activeTokens:
[ { jti: '5d872359af2c47e5970c1fae531adf0e' },
{ jti: 'd3ac84f520614067b1caad504d7ab27f' },
{ jti: '25c6fa96705c4eec96e1427678c3ff50' },
{ jti: 'b816cf00e9f649fbaf613e2ca2d523b5' }
]
}
How can I get all the jti fields except { jti: b816cf00e9f649fbaf613e2ca2d523b5 } from the select command?
Desired Output
{ activeTokens:
[ { jti: '5d872359af2c47e5970c1fae531adf0e' },
{ jti: 'd3ac84f520614067b1caad504d7ab27f' },
{ jti: '25c6fa96705c4eec96e1427678c3ff50' },
]
}

Answer 1

It's hard to say for certain without testing, but i don't think mongoose returns the document after it was modified, but rather simply returns the matching document. So, i think in the case of findOneAndUpdate, you would have to have your query match to do the pull, and then manually filter the array again in application code to get the desired output.
This might work:
const removeDevices = await Identity.findOneAndUpdate(
{
userID: user_id
},
{
$pull: {
'activeTokens.jti': { $ne: jwt_id }
}
},
).select(["-_id", "activeTokens.jti"]).then(identity=>identity.activeTokens.filter(token=>token.jti!==jwt_id));
If the above doesn't work for some reason, then i would try something more simpler
simple:
const removeDevices = await Identity.findOne({userID: user_id}).select(["-_id", "activeTokens"]).then(identity=>{
const removedTokens = []
identity.activeTokens = identity.activeTokens.filter(token=>{
if(token.jti===jwt_id) {
return true;
}
removedTokens.push(token);
})
identity.save(err=>{
console.log('doc saved')
});
return removedTokens;
});
or (atomic):
const removeDevices = await Identity.findOne({userID: user_id}).select('activeTokens','jti _id').then(identity=>{
const removedTokens = identity.activeTokens.filter(token=>token.jti!==jwt_id);
const result = await Identity.update({userId:user_id},{$pull:{'activeTokens._id': { $in: removedTokens.map(t=>t._id) } }});
console.log(result.nModified);
return removedTokens;
});