MongoDB Query for documents array size is greater than
Today in this article we will see how to perform MongoDB – Query for documents array size greater than 1 or more.
Recently I was trying to find all the records where the array field has more than 1 entry.
After the initial trivial, I found there is no direct query but was able to find a query that helped me address this requirement easily.
Today in this article, we will cover below aspects,
Below is a sample JSON where array order is defined as an array type.
{
"_id": "617f1b826cbcd5cf388e44f7",
"Ssn": {
"$binary": "AQN8wobDt3M8SsOPwrjDsHNVw5Ymwo3DlQJ1AQpYwrhyw6oIwp/CgAzCpCHDqcKBwrDCjTo+w4/CsMO0wozDmmfCuxE7w4tywofDoR/DhMOgw6HDhsKZwoRLwovCu8KDXQTCncKbL11nwpRQBMKeTcKLFlXCvwYxwrxUwoo=",
"$type": "0"
},
"City": "NY",
"Country": "USA",
"States": "NY",
"Zip": "12345",
"order": [ "name1", "name2", "name3" ],
"Name": "John"
}
Array order has 1 to 3 items in the collection.
We will build a query to find all the items where the array size is greater than 1.
Approach I – MongoDB Query using the not-equal operator
Command
{<array field>: {$type:'array', $ne: [] }}
Example
{order: {$type: 'array', $ne: []}}
The above query confirms if the array element has at least 1 or more records.
In our above example, The below query gives us results for array size 1 or 2 as below,
Approach II – MongoDB Query for documents array size is greater than 0 or 1 or 2
Query – MongoDB array documents with a count greater than1
{'order.0': {$exists: true}}
The above query will return all the records where the array size is greater than or equal to 1
Get MongoDB array documents with a count greater than 2
{'order.1': {$exists: true}}
The above query will return all the records where the array size is greater than or equal to 2
References:
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