Update a document in an array in MongoDB using webMethods - json

Question

I have a requirement to a particular document in the arrayList, the sample JSON string for that is
{
"_id" : ObjectId("58b9339502be203f6b476664"),
"_docType" : "Test",
"type" : "mongoUpdate",
"createdDateTime" : "2017-03-03 09:12:53.080",
"contacts" : [
{
"firstName" : "FirstName",
"lastName" : "LastName",
"email" : "someName#email.com",
"contactType" : "Business.",
"phoneNumber" : "1234567890",
"createdDateTime" : "2017-03-03 09:13:04.229",
"lastModifiedDTM" : "2017-03-03 09:13:04.229",
},
{
"firstName" : "FirstName2",
"lastName" : "LastName2",
"email" : "someName#email.com2",
"contactType" : "Business2.",
"phoneNumber" : "1234567890",
"createdDateTime" : "2017-03-03 09:13:04.229",
"lastModifiedDTM" : "2017-03-03 09:13:04.229",
},
{
"firstName" : "FirstName3",
"lastName" : "LastName3",
"email" : "someName#email.com3",
"contactType" : "Business.3",
"phoneNumber" : "12345678903",
"createdDateTime" : "2017-03-03 09:13:04.229",
"lastModifiedDTM" : "2017-03-03 09:13:04.229",
}
]
}
Say I have to update one of the occurrence in the above json.
I have used the $set operation to update the above array and when I see the content in the mongo db I see the the whole array is replaced by single occurrence of contact.
the update command which I have used is
{$set:{"contacts":[{"firstName":"test0103)12","lastName":"test0103","email":"test0103","contactType":"test0103","phoneNumber":"test0103","createdDateTime":"test0103"}]}}
after executing this I see that the whole array list of 3 is replaced with the single instance of contacts.
and at the end I have the output as
"contacts" : [
{
"firstName" : "test0103)12",
"lastName" : "test0103",
"email" : "test0103",
"contactType" : "test0103",
"phoneNumber" : "test0103",
"createdDateTime" : "test0103"
}]

Answer 1

Here is the sample code
First find the document using _id. here collection I took is user
` User.findOne({'_id': 58b9339502be203f6b476664},(err,res) => {
if(res.contacts.length > 0){
var contacts = res.contacts;
var contactsList = [];
var contactobject = {};
// suppose you want to update the contact with firstname - FirstName2
contacts.map((contact,key)=>{
if(contact.firstName == "firstName2"{
contactobject.firstName = "Your updated name";
contactobject.lastName = "Your updated name";
// similary all values you want to update
// Then push to an array after updating new data
contactsList.push(contactObject);
}
else {
// if not the required contact to update
// simply push
contactsList.push(contact);
}
})
// After the map function , now update the new contacts
User.update({email:email},
{$set:{contacts: contactsList}},(err,result) => {
User.findOne({'_id':res._id}).then(updateuser => {
resolve(updateuser);
})
})
}
}) `
Try this , It works