I want to update a array value but i am not sure about the proper method to do it ,so for i tried following method but didnt worked for me.
My model, The children field in my model
childrens: {
type: Array,
default: ''
}
My query,
Employeehierarchy.update({ _id: employeeparent._id} ,{ $set: {"$push": { "childrens": employee._id }} })
.exec(function (err, managerparent) {});
Can anyone please provide me help.Thanks.
You can't use both $set
and $push
in the same update expression as nested operators.
The correct syntax for using the update operators follows:
{
<operator1>: { <field1>: <value1>, ... },
<operator2>: { <field2>: <value2>, ... },
...
}
where <operator1>, <operator2>
can be from any of the update operators list specified here.
For adding a new element to the array, a single $push
operator will suffice e.g. you can use the findByIdAndUpdate
update method to return the modified document as
Employeehierarchy.findByIdAndUpdate(employeeparent._id,
{ "$push": { "childrens": employee._id } },
{ "new": true, "upsert": true },
function (err, managerparent) {
if (err) throw err;
console.log(managerparent);
}
);
Using your original update()
method, the syntax is
Employeehierarchy.update(
{ "_id": employeeparent._id},
{ "$push": { "childrens": employee._id } },
function (err, raw) {
if (err) return handleError(err);
console.log('The raw response from Mongo was ', raw);
}
);
in which the callback function receives the arguments (err, raw)
where
err
is the error if any occurredraw
is the full response from MongoSince you want to check the modified document, I'd suggest you use the findByIdAndUpdate
function since the update()
method won't give you the modified document, just the full write result from mongo.
If you want to update a field in the document and add an element to an array at the same time then you can do
Employeehierarchy.findByIdAndUpdate(employeeparent._id,
{
"$set": { "name": "foo" },
"$push": { "childrens": employee._id }
}
{ "new": true, "upsert": true },
function (err, managerparent) {
if (err) throw err;
console.log(managerparent);
}
);
The above will update the name
field to "foo" and add the employee id to the childrens
array.