如何进行 mongo 查询以查找数组包含给定 id 的所有文档？

Question

I am not sure what i am doing wrong. I have a User collection which has a field "followingUsers" (array). This array contains the id's of other users. When an user gets deleted i want that every other user document no longer has a reference to the deleted user in their followUsers array. I am not experienced with mongo so i decided to make a find query first, but i get back an empty result on each attempt.

I wrote the following queries and none of them seem to work:

db.users.find({"followingUsers": "63d0522c655fa263cfe003e7"})
db.users.find({"followingUsers": {"$all": ["63d0522c655fa263cfe003e7"] } } )

In the image you can see the data i expect to get back: Data i expect to get back

What am i doing wrong?

Answer 1

With the help of the user with nickname ray, i found the correct queries:

db.users.find( {'followingUsers': ObjectId("63cff74e3ae933124ee20d05")}  )
db.users.find( {'followingUsers': {"$all":[ ObjectId("63cff74e3ae933124ee20d05") ] }}  )

I was indeed storing ObjectId's inside the array and not just strings.