Secondary keys with a Map/Reduce views Documents in the "views" field of a "design" document The %map()% function is called once per document View output sorted by key View results are stored in btrees

{ "_id" : "569ae205b8c96e09421b2869", "slug" : "arran", "name" : "Arran", "region_slug" : "scotland-islands", } Map function: function(doc) { if(doc.region_slug && doc.slug) { emit(doc.region_slug, doc.slug); } } Query: curl -XGET localhost:5984/dramio/_design/docs/_view/by_region { "total_rows": 1, "offset": 0, "rows": [ { "key": "scotland-islands", "id": "569ae205b8c96e09421b2869", "value": "arran" }, ] }