Update single sub document in multiple array in mgo - mongodb

Question

I have following mongodb (3.4.x) document, i code in golang with mgo driver
{
"id": "5981d4c2795a1b4a801ee027",
"scenarioId": "59804b10d8ee910085e33865",
"messages": [
{
"id": "5981d4c2795a1b4a801ee028",
"toQueue": [
{
"id": "5981d4c2795a1b4a801ee029",
"to": {
"email": "some#email.com"
},
"channel": "EMAIL",
"toType": "EMAIL",
"status": {
"id": 1,
"groupId": 1,
"groupName": "PROCESSING",
"name": "APPROVED",
"description": "MessageChain approved for processing"
}
},
{
"id": "5981d4c2795a1b4a801ee02a",
"to": {
"phone": "[phone]"
},
"channel": "SMS",
"toType": "PHONE",
"status": {
"id": 1,
"groupId": 1,
"groupName": "PROCESSING",
"name": "APPROVED",
"description": "MessageChain approved for processing"
}
}
],
"status": {
"id": 1,
"groupId": 1,
"groupName": "PROCESSING",
"name": "APPROVED",
"description": "MessageChain approved for processing"
}
},
{
"id": "5981d4c2795a1b4a801ee02b",
"toQueue": [
{
"id": "5981d4c2795a1b4a801ee02c",
"to": {
"phone": "[phone]"
},
"channel": "SMS",
"toType": "PHONE",
"status": {
"id": 1,
"groupId": 1,
"groupName": "PROCESSING",
"name": "APPROVED",
"description": "MessageChain approved for processing"
}
}
],
"status": {
"id": 1,
"groupId": 1,
"groupName": "PROCESSING",
"name": "APPROVED",
"description": "MessageChain approved for processing"
}
}
],
"messageStages": [
{
"id": "5981d4c2795a1b4a801ee033",
"validityPeriod": 5,
"validityPeriodTimeUnit": "MINUTES",
"providerId": 5,
"email": {
"text": "this is the email text",
"subject": "and here the email subject"
},
"status": {
"id": 1,
"groupId": 1,
"groupName": "PROCESSING",
"name": "APPROVED",
"description": "MessageChain approved for processing"
}
}
]
}
and I know the value of messages.$.toQueue.id, where i want to update status.id in the related toQueue Array Item.
I tried to do it that way:
query = bson.M{
"messages.toQueue._id": toQueueId,
}
update = bson.M{
"$set": bson.M{
"messages.$.toQueue.$.status.id": status.Id,
"messages.$.toQueue.$.status.name": status.Name,
"messages.$.toQueue.$.status.groupId": status.GroupId,
"messages.$.toQueue.$.status.groupName": status.GroupName,
"messages.$.toQueue.$.status.description": status.Description,
},
}
err = cr.Update(query,update)
but multiple $ are not allowed. Without it's also not updateable.
Is there any way to update only the subdocument, which i found in query ?

Answer 1

Neil Lunn gave the right answer.
It's not possible to work with nested arrays the way I tried to do. And he is also right, that problem is coming from design mistake.
So I changed it as him and Markus W Mahlberg suggested to move the toQueue part in a separate collection, with messageId as a reference.