code: function updateWithHandler (ddoc, viewName, docName, body, callback) {
        if (typeof body === 'function') {
          callback = body
          body = undefined
        }
        return view(ddoc, viewName + '/' + encodeURIComponent(docName), {
          type: 'update',
          method: 'PUT',
          body: body
        }, callback)
      }
docs: http://docs.couchdb.org/en/latest/api/ddoc/render.html#put--db-_design-ddoc-_update-func-docid