code: function wrapQueryMethod(fn, ctx) {
      return function() {
          // Obtain function arguments
          var args = [].slice.call(arguments);
          
          // Return a thunkified function that receives a done callback
          return function(done) {
              // Add a custom callback to provided args
              args.push(function(err, result) {
                  // Query failed?
                  if (err) {
                      return done(err);
                  }
  
                  // Query succeeded
                  done(null, result);
              });
  
              // Execute the query
              fn.apply(ctx, args);
          };
      };
  }
docs: Thunkify query methods