Adding a reduce function to a view is surprisingly easy to do using Futon.
1. Open your browser and go to the
vergedatabase in Futon (http://localhost:5984/_utils/database.html?verge).2. Click on the view drop-down box, and you'll see the application (the name of our design document). You can click on the view called
posts_by_user.3. Click on View Code, so that you can see the text areas for Map and Reduce.
4. Enter
_countinto the Reduce text area, and click on Save.5. You can verify that your
reducefunction is working properly by clicking on the Reduce checkbox right below the Save button.6. You should see a screenshot similar to the following:
