A simple couchdb view.js

{
    "_id": "_design/tests",
    "_rev": "2-9712dcb1e76a5cc7ab0e0e0b5bf7a70a",
    "language": "javascript",
    "views": {
        "id": {
            "map": "function(doc) {\n  emit(doc._id, doc);\n}"
        }
    }
}