auxilincom / node-mongo Goto Github PK

findOneAndUpdate(query, update, options = { returnOriginal: false }) {
    let originalDoc;
    return this.findOne(query) // return null
      .then((doc) => {
        originalDoc = doc; // originalDoc === null

        return this._collection.findOneAndUpdate(query, update, options); // return null
      })
      .then((doc) => { // doc === null
        if (originalDoc) { // skipped
          this._bus.emit('updated', {
            doc,
            prevDoc: originalDoc,
          });
        } else {
          this._bus.emit('created', { // why?
            doc, // doc === null
          });
        }

        return doc;
      });
  }