How to filter array document in stage project with cond if some field are null or exist

hii friend, i have some document, and there is field queue that contain an array object. i want to filter some object inside field queue which has a name checkInTime with value null. how to find it ?

this is my mongoplayground

I think you simply have a typo error.

Try with

"$$this.checkinTime",

Rather than

"$$this.checkInTime",

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:open_mouth: :open_mouth: :open_mouth: :open_mouth:
thanks, i didn’t realize it :pray: :pray: :pray: :ok_hand:

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