Change type of value in collection using update - mongodb

Question

I am looking for a way, how to update multiple documents in MongoDB. I want to modify similar structure like this one:
{[
"_id": 'mongo_id',
"name": "Name"
]}
to the structure like this, basically just change string attribute to object attribute with string property :
{
"_id": 'mongo_id',
"name": {
"type_1": "Name",
"type_2": ""
}
}
Is there a way how to do it in single mongo query or I have to create some kind of worker for example in node.js?

Answer 1

If you do not have any schemas involved to put constrains on your collections or if you have and name is defined as mixed type (from mongoose types as an example) then you can do whatever you want to any of the properties other than _id.
for example this update will change name to the object you want:
db.getCollection('<collectionName>').update({
_id: "mongo_id")
}, {
name: {
"type_1": "Name",
"type_2": ""
}
})

Answer 2

It looks like the best solution is create little worker to get all documents and update them in collection. I used node.js and mongodb npm package to create worker similar to this one:
var mongo = requiere('mongodb');
mongo.connect(process.env.MONGO_URL, function(err, database) {
if (err) {
throw err;
}
db = database;
db.collection('<collectionName>').find({}).toArray(function(err, array) {
if (err) {
console.log(err);
return process.exit(1);
}
console.log('length:', array.length);
var promises = [];
array.forEach(item => {
promises.push(db.collection('<collectionName>').update(
{
_id: item._id
},
{
'$set': {
'name': {
'type_1': item.name,
'type_2': '',
}
}
}))
});
return Promise.all(promises).then(function() {
console.log('Done');
return process.exit(0);
}).catch(function(err) {
console.log('err:', err);
return process.exit(1);
});
});
});