access id of a nested document in mongoose - mongodb

Question

I want to write a put method in express for a nested document in mongoose.
I cannot access the id for the nested document.
{ "_id" : ObjectId("5b8d1ecbb745685c31ad8603"),
"name" : "abc",
"email" : "abc#gmail.com",
"projectDetails" : [
{
"technologies" : [
"abc",
"abc"
],
"_id" : ObjectId("5b8d1ecbb745685c31ad8604"),
"projectName" : "abc",
"projectDescription" : "abc",
"manager" : "abc",
"mentor" : "abc"
}
],
"__v" : 0
}
I am trying to access the id ("5b8d1ecbb745685c31ad8604") so that I can update the projectName.
I cannot think of how to write a put method for the same. Please help! Thanks in advance!!

Answer 1

You can use model.findOne() and then save() th update the document instead of model.findOneAndUpdate().
var projectId = "5b8d1ecbb745685c31ad8604";
var newProjectName = "def";
model.findOne({'projectDetails._id': projectId}, (err, data) => {
if (data) {
data.projectDetails.forEach((project) => {
if (project._id == projectId) {
project.projectName = newProjectName;
}
});
data.save();
} else {
// throw error message
}
})

Answer 2

app.put('/api/project/:id',(request,response)=>{
const projectId = request.params.id;
const projectName = "test";
db.users.update({"projectDetails._id":projectId},{$set:{"projectDetails.$.projectName":projectName}},function(err,data){
if(data){
}else{
}
})})
Instead of forEach try above query