Use variable name in mongoDB expression (nodejs)

Question

I am trying to use the value of a variable in a mongo expression as you can see below:

DbModels.prototype.findByParam = function(_collection, param, id, callback) {
    this.getCollection(_collection, function(error, sel_collection) {
      if( error ) callback(error)
      else {
        sel_collection.findOne({param.toString(): id}, function(error, result) {
          if( error ) callback(error)
          else callback(null, result);
        });
      }
    });
};

However, the param.toString() gives an error. Any suggestions how I can use the value of the param variable in the mongoDb expression?

Thanks

What error are you getting? What is the value of param?

Timothy Strimple
– Timothy Strimple

2012-02-26 18:41:49 +00:00
Commented Feb 26, 2012 at 18:41 — Timothy Strimple
– Timothy Strimple, Commented Feb 26, 2012 at 18:41

Raynos · Accepted Answer · 2012-02-26 20:05:31Z

3

This syntax {param.toString(): id} is not valid.

Try

var query = {};
query[param.toString()] = id;
sel_collection.findOne(query, function(error, result) {
  if( error ) callback(error)
  else callback(null, result);
});

answered Feb 26, 2012 at 20:05

Raynos

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