Increment key based on another field

[iamchathu]

Let's say we have Incremented Value(ref) in the document which need to be incremented based on another field(shopId)

{
   "ref": 12,
   "shopId":1
},
{
   "ref": 13,
   "shopId":1
},
{
   "ref": 1,
   "shopId":2
},
{
   "ref": 2,
   "shopId":2
},
{
   "ref": 14,
   "shopId":1
}

What kind of approach can we have? ( the two properties are compound index)

[hasezoey]

with this plugin currently not possible (increment value based on other value)

[tiennguyen1203]

Any update on this?

[hasezoey]

like it was said earlier in the comments, it is currently not possible.

if you want it yourself, either implement it and send a PR or better explain what is necessary / wanted.

to summarize (on my understanding), you would need a external (like AutoIncrementID) tracker for the base number, but increment it by another field before applying, tracker + field = newid; or am i misunderstanding something?