Convert Double to String Mongodb

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I own a field Double in a Collection on Mongodb and would like to exchange this field in every collection to String.

mongodb type-conversion

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//inteiro para string
db.temp.find({name: {$exists:true}}).forEach( function(x) {
    db.temp.update({_id: x._id}, {$set: {name: x.name.toString()}});
});

//string para data
db.temp.find({name: {$exists:true}}).forEach( function(x) {
    db.temp.update({_id: x._id}, {$set: {name: ISODate(x.name}});
});

//string para inteiro
db.temp.find({name: {$exists:true}}).forEach( function(x) {
    db.temp.update({_id: x._id}, {$set: {name: NumberInt(x.name)}});
});

Source: http://codigosimples.net/2016/03/05/conversao-de-tipos-com-mongodb/

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