How to access one model Schema in another model mongoose database - node.js

Question

I have two schemas one is user schema in user.js file and other is product schema in product.js file
My user schema in user.js file as follows:
var userSchema = new Schema({
firstname: {
type: String,
required: true
},
lastname: {
type: String,
required: true
},
password: {
type: String,
required: true
},
mobileno: {
type: Number,
unique: true,
required: true
},
facebookid: {
type: String
},
userimage: {
type: String
}
});
and I am overriding automatically generated _id using mongoose-auto-increment module to get automatically incremented userId in user collection.
And my product schema in product.js file as follows:
var productSchema = new Schema({
userId: {
type: String,
required: true
},
productName: {
type: String,
required: true
},
productId: {
type: String,
required: true
},
price: {
type: Number,
unique: true,
required: true
},
prodcutImage: {
type: String
}
});
When user will add new products in collection he will fill all the fields mentioned in product schema. I want to verify that entered userId is exists in user collection or not when new product is added by user in product collection.
I tried to access userSchema.find method in productSchema pre save hook
productSchema.pre('save', function (next) {
userSchema.findOne({'_id': userId}, function(err, user)
{
console.log(user);
});
}
But It returns an error. Can somebody help me in this issue.

Answer 1

You can do like this
app.get('/user/:id', function (req, res, next) {
userSchema.findOne({'_id': userId}, function(err, user)
{
if(user){
next()
}else{
res.json("user id is not valid");
}
});
}, function (req, res, next) {
// code to add your product in product schema
})
more better way is to use Router-level middleware of express