Trouble in using forEach function in node.js - node.js

Question

I have been learning about q promises and tried to build up some mock APIs to implement its functionality,While doing so I came across the following error,
Enterprise.forEach is not a function
My API code is as follows,
var mongoose = require('mongoose');
var Enterprise = mongoose.model('Enterprise_gpy');
var q = require('q');
var displayEnterprise = function(req, res) {
function displayEnterpriseName() {
var deferred = q.defer();
Enterprise.forEach(function(err, doc) {
if (err) {
console.log('Error Finding Files');
deferred.reject(err);
} else {
var name = Enterprise.enterprise_name;
deferred.resolve({
name: name
});
}
return deferred.promise;
});
}
function displayEnterpriseEmail() {
var deferred = q.defer();
Enterprise.forEach(function(err, doc) {
if (err) {
console.log('Error Finding Files');
deferred.reject(err);
} else {
var email = Enterprise.enterprise_email;
deferred.resolve({
email: email
});
}
return deferred.promise;
});
}
q.all([
displayEnterpriseName(),
displayEnterpriseEmail()
])
.then(function(success) {
console.log(500, success);
})
.fail(function(err) {
console.log(200, err);
});
}
module.exports = {
displayEnterprise: displayEnterprise
}

Answer 1

In your code Enterprise is a mongoose schema so when you try to do loop using forEach then got
Enterprise.forEach is not a function
you can use forEach after Enterprise.find(). so use
Enterprise.find({}, function(err, docs) {
if (err) {
console.log('Error Finding Files');
deferred.reject(err);
} else {
var names = [];
docs.forEach (function(doc) {
var name = doc.enterprise_name;
names.push(name);// pushed in names array
//.....
});
deferred.resolve({
names: names
}); // return all names
}
});
instead of
Enterprise.find().forEach
and should use
var name = doc.enterprise_name; instead of var name = Enterprise.enterprise_name;
and
var email = doc.enterprise_email; instead of var email = Enterprise.enterprise_email;

Answer 2

forEach only works for arrays, and you're using it on a mongoose model.
try this instead:
Enterprise.find().exec(function(err, docs) {
docs.forEach(function(doc) {
// do something with all the documents
}
// do something outside the loop
})