Answers for "mongo $push if array, if not set"

mongodb add to array if not exists

db.tags.update(
    {name: 'sport'},
    {$addToSet: { videoIDs: "34f54e34c" } }
);

Posted by: Guest on October-22-2020

mongodb push to arry in update

db.collection.update({_id:xx}, {$push:{letters : {$each:['first one'], $position:0}}})

Posted by: Guest on March-22-2020

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