daggerheart/module/data/subclass.mjs

import { getTier } from "../helpers/utils.mjs";
import featuresSchema from "./interface/featuresSchema.mjs";
import DaggerheartFeature from './feature.mjs';

export default class DhpSubclass extends foundry.abstract.TypeDataModel {
    static defineSchema() {
      const fields = foundry.data.fields;
      return {
        description: new fields.HTMLField({}),
        spellcastingTrait: new fields.StringField({ choices: SYSTEM.ACTOR.abilities, integer: false, nullable: true, initial: null }),
        foundationFeature: new fields.SchemaField({
            description: new fields.HTMLField({}),
            abilities: new fields.ArrayField(new fields.EmbeddedDataField(DaggerheartFeature)),
        }),
        specializationFeature: new fields.SchemaField({
            unlocked: new fields.BooleanField({ initial: false }),
            tier: new fields.NumberField({ initial: null, nullable: true, integer: true }),
            description: new fields.HTMLField({}),
            abilities: new fields.ArrayField(new fields.EmbeddedDataField(DaggerheartFeature)),
        }),
        masteryFeature: new fields.SchemaField({
            unlocked: new fields.BooleanField({ initial: false }),
            tier: new fields.NumberField({ initial: null, nullable: true, integer: true }),
            description: new fields.HTMLField({}),
            abilities: new fields.ArrayField(new fields.EmbeddedDataField(DaggerheartFeature)),
        }),
        multiclass: new fields.NumberField({ initial: null, nullable: true, integer: true }),
      }
    }

    get multiclassTier(){
        return getTier(this.multiclass);
    }
}