Nested classes how-to in Dgraph 101

[marc4gov]

I'm trying to extend the Dgraph 101 example with AssemblyScript to my own nested classes and types, but I run into errors when trying to upsert them. Plain, unnested classes seem to work fine.
I'm sure there's an easy fix for this, but not able to find it, see attached files.

as.zip

[marc4gov]

So, a bit further down the rabbit hole... I cannot get the graph relations the way they should be. AssemblyScript is complaining about circular references EnergyProfile/PumpingStation - I get that - but now I end up with these classes, they work, but I lose the typical Graph features now:

export class EnergyProfile {
    @alias("EnergyProfile.id")
    id!: string

    @alias("EnergyProfile.pumpingstation_id")  // Note the _id suffix
    @omitnull()
    pumpingstation_id: string | null = null     // Actually store the ID as string

    @alias("EnergyProfile.name")
    name: string = ""

    @alias("EnergyProfile.day")
    day: i16 = 1

    @alias("EnergyProfile.month")
    month: i16 = 1

    @alias("EnergyProfile.price")
    price: f32[] = [1.0]
}

@json
export class PumpingStation {
    @alias("PumpingStation.id")
    id!: string

    @alias("PumpingStation.name")
    name: string = ""

    @alias("PumpingStation.flow_rate")
    flow_rate: f32 = 0.0

    @alias("PumpingStation.energyprofile_ids")  // Note the _ids suffix
    @omitnull()
    energyprofile_ids: string[] | null = null   // Actually store IDs as strings

    @alias("PumpingStation.place")
    place: string = ""
}