JAVASCRIPT

mongodb check for array not empty query

collection.find({ arrayElementName: { $exists: true, $not: {$size: 0} } })

mongodb filter empty array

db.collection.find({arrayElementName : {$exists:true, $size:0}})

mongodb empty an array field

db.collection.update({}, { $set : {'myArray': [] }} , {multi:true} )

why geting empty array from mongodb

//mongobd database name should be use in Like
"E-Shop" or "E_Shop"
//must use underscore or -