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How to count the number of elements in an array in Monge?
Let's say I have such an object in the collection:
{
"_id" : 123,
"name" : "Eclipse",
"arrayOne" : [
{
"name" : "nameArray",
"arrayTwo" : [
{
"items" : [
"1",
"2",
"3"
]
}
]
}
]
}
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