MongoDB sprawdź tablicę, a nie puste zapytanie
collection.find({ arrayElementName: { $exists: true, $not: {$size: 0} } })
Tame Tortoise
collection.find({ arrayElementName: { $exists: true, $not: {$size: 0} } })db.collection.find({arrayElementName : {$exists:true, $size:0}})db.collection.update({}, { $set : {'myArray': [] }} , {multi:true} )