docs: function (cb) {
  
                  var db  = linz.mongoose.connection.db,
                      configKeys = Object.keys(req.linz.configs),
                      filter = { _id: { $in: configKeys } };
  
                  db.collection(linz.get('configs collection name'), function (err, collection) {
  
                      // find documents matching each of the available config schema name
                      collection.find(filter).toArray(function(err, items) {
  
                          if (err) {
                              return cb(err);
                          }
  
                          if (items.length === 0) {
                              // return error to skip the next asyn function that inspect the records since none is found.
                              return cb(new Error('No record found.'), items) ;
                          }
  
                          return cb(null, items);
  
                      });
                  });
  
  			}