How to filter out the documents based on dynamic keys before using $objectToArray?

[Takis]

Hello

I think you ask something similar to this

How to group an array using reduce, without unwind+group?

Thank you for trying to help me,i think its not possible to group an array only by using reduce in mongoql. I will make a new topic,asking about the root of the problem. Thank you alot

MongoDB missing basic document(object) operators?

Thank you i was searching for that on JIRA also it would be nice we to have those,i upvoted and i am watching it,but i don’t think i can create JIRA to ask for those. if we have get we can do contains,and put using get and mergeobjects (new value(we can do it even now) or updated). I think remove is also needed,i don’t know a way to do it. $$mydoc = one document $$mykey = one key get("$$mydoc","$$mykey") //we need this to be added contains?("$$mydoc","$$mykey") //if we ha…

If the keys are uknown,the only way that i know is javascript and $function operator.

Upvote that Jira(see second link) if you want also,but i think that jira is only for get($$doc,$$key),i tihnk we need remove also at least