How to say… match when field is a number… in mongodb?

Question

So I have a field called \'city\' in my results...the results are corrupted, some times it\'s an actual name, sometimes it\'s a number. The following code displays all the recor

Answer 1

you can also try like the following, using regular expression without using $regex

db.zips.aggregate([
{$project : { city : { $substr : ["$city",0,1] } }}, 
{$sort : {city : 1}}, 
{$match: { city:/[0-9]/}}
])

Answer 2

With the mongodb 4.4 (upcoming), You can use $isNumber pipeline operator to check whether the expression is integer or other BSON type.

db.zips.find({ "$expr": { "$anyElementTrue": { "$isNumber": "$city" }}})

$isNumber will return true or false corrsoponding to the expression and $anyElementTrue will return the $matched documents.