Mongo convert all numeric fields that are stored as string

Question

It looks like for a while now I\'ve been storing my decimals as strings. This is now a problem because I need to start using the aggregation framework to perform some calcul

Answer 1

Something like this should work from the mongo shell:

db.yourCollection.find({}).forEach(function(doc) { 
    if(isNaN(doc.xyz)) { 
        print('found string: ' + doc._id);
        db.yourCollection.update( 
           { _id: doc._id}, 
           { $set : { "xyz" : parseFloat(doc.xyz) } }
        )
    }
})

It loops through each document, uses isNaN as you suggested, then $sets the value to the parseFloat value for the current document.