Description

I have a situation where I want to validate that v2 is unique across all v's. I wrote a decorator to handle this and was pointed over here for similar functionality but was unable to do what I was trying to accomplish.

interface V{
    v2: {id: string}[]
}

class VValidate{
    @ArrayUnique(v => v.v2.flatMap(item => item.id))
    v: V[]
}

Proposed solution

Adjust arrayUnique to use flatMap rather than map. This should only change its interaction with arrays.
Problem: Arrays that were to match based on reference would now be destructed into their components and I am unsure about the usage of this.
Alternative: Create a new decorator for this but it seems like overkill for this use case