Exploring MongoDB's $in and $ne Operators

Looking to retrieve some Documents based on a field that may exist in an array if a filter is applied. However, I also need to ensure that the same field does not equal null unconditionally. While using $in: [some values] can prevent null from being included, the challenge lies in creating a conditional query based on whether a filter is set or not.

Is there a more efficient approach to achieving the same outcome as below? Would it even work?

db.Parents.fetch({
        childId: { $in: childIds },
        childId: { $ne: null }
    });
    

Answer №1

To achieve this, leverage the $and operator

db.Users.find({
    $and:[
      {childId: { $in: kidIds }},
      {childId: { $ne: null }}
    ]
});  

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