node.js - How to do a simple MongoDB find query on LoopbackJS? -

i want know how perform simple findall or findone query on loopbackjs.

on different question suggest me do this:

module.exports = function(transaction) {     transaction.observe('access', function(ctx, next) {       transaction.find({}, function(err, data) {       console.log(data);       next();// sure call callback function       });     }); }; 

but trying on api explorer gives me out of range error , seems complicated simple query.

solver, check docs here:

https://docs.strongloop.com/display/public/lb/extend+your+api