slow upsert in Sails.js

gistfile1.js

module.exports = {

  attributes: {

  	/* e.g.
  	nickname: 'string'
  	*/
    
  },

  /**
   * @param {Object} condition
   * @param {Object} doc
   * @return {Promise} passes Array.<Object>
   */
  upsert: function(condition, doc) {
    var that = this;
    return this.findOne(condition)
    .then(function(olddoc) {
      return olddoc ?
          that.update(condition, doc).toPromise() :
          that.create(doc).then(function(doc) {
            return [doc];
          });
    })
  },

  /**
   * @param {Object} doc
   * @return {Promise} passes document object
   */
  upsertById: function(doc) {
    var id = doc.id; // How do I get primaryKey.
    var that = this;
    return this.findOne(id)
    .then(function(olddoc) {
      return olddoc ?
          that.update(id, doc).toPromise().get(0) :
          that.create(doc).toPromise();
    })
  }

};