How to change collection name with dynamic name in node.js - node.js

Question

I have a node.js project. In my project i want to use the collection( means model) name with dynamic name. In my code i will explain you about what my need actually is. This code is working fine.
User.findById(req.param('id'),function(err,user){
console.log('entered');
if(err){
res.json(HttpStatus.INTERNAL_SERVER_ERROR,{error:'unexpected error'});
return;
}
if(user == null){
res.json(HttpStatus.NOT_FOUND,{error:'user not found'});
return;
}
console.log("success");
Here, my collection(model) name is User. But i want to use the value of the client as "collection name" by using the code below
var temp = req.body.collectionName; // example: var temp ='User';
Can i use value of the temp variable in the place of "User".findById. If not, can i get any possible solutions for this functionality to happen?
Thanks in advance.

Answer 1

Looks like you're using Mongoose, in which case you can use mongoose.model(MODEL_NAME) to get a reference to a particular model:
var mongoose = require('mongoose');
...
var User = mongoose.model('User'); // or `req.body.collectionName`
User.find(...);

Answer 2

You haven't mentioned what framework and ORM you are using, so here's a simple way that you can use provided your model names are predetermined:
var collections = {
"User": User,// reference for model User
"Resource": Resource
};
var temp = req.body.collectionName;
if (collections[temp]) {
collections[temp].findById(req.param('id,), handler);
}
You should first try to find out if your ORM provides a list/mapping of models and use that if possible. Usually there is a hook or other inherent way of accessing them.

Answer 3

This code doesn't work for me. I'm using express framework with node.js. I'm using mongoose as my middleware.
var collections = {
"User": User,// reference for model User
"Resource": Resource
};
var temp = req.body.collectionName;
if (collections[temp]) {
collections[temp].findById(req.param('id,), handler);
}