Matching conditions in MongoDB are contingent upon specific requirements

I'm struggling with implementing Mongo Queries, particularly in relation to a specific section of code.

The problem arises when attempting to perform a query that involves checking a variable and then making a match.

const FIRST_SUBJECT = keywords_list[0].subjects || {"$ne":null};

.
.
.

{'$match': {'entities.qcode': FIRST_SUBJECT}},

In this scenario, I only want to execute the $match if FIRST_SUBJECT is not empty or null.

I have experimented with using a $cond within the $match, as well as considering other approaches, but encountered errors in both cases.

To put it simply:

if(FIRST_SUBJECT)
$match
else
skip $match

Can anyone provide guidance on how to achieve this effectively?

javascriptmongodbmongoose

Answer №1

In my opinion, it is essential to incorporate the or operator.

   $match: {
      $or : [
       { "objects.code" : list_of_terms[0].categories} ,
       { "objects.code" : {$ne:null} }
    ]}

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