So short version is I am working on trying to setup the ability to download data from a API call and then save it into swift data. So far it seems to be the best way to do what I am wanting to do as trying to. preload with a JSON. or create the database seperately is proving frustraiting.

//
//  UnitModel.swift
//  Save API Data to Swiftdata
//
//  Created by Matt Ross on 12/19/23.
//

import SwiftData
import Foundation

@Model
class Unit: Codable {
    enum CodingKeys: CodingKey {
        case age, aidisID, ailmentResist, attributeBoard, attributeInnate, attributeResist, availability, avatar, birthday, category, critRate, demerits, equipment, faintPoint, from, gender, gender1, habits, hasShift, height, hobbies, icon, id, job, label, merits, moveSpeed, name, previewStats, race, releaseDate, releaseNote, shift, shiftID, skillCount, skills, type, weapon, weight
    }

      var age: String?
      var aidisID: Int
      var ailmentResist: AilmentResist
      var attributeBoard: String
      var attributeInnate: String
      var attributeResist: [AttributeResist]
      var availability: String
      var avatar: URL
      var birthday: String?
      var category: String
      var critRate: String
      var demerits: String?
      var equipment: [String]
      var faintPoint: Int
      var from: String?
      var gender: String
      var gender1: String
      var habits: String?
      var hasShift: Bool
      var height: String?
      var hobbies: String?
      var icon: URL
      var id: Int
      var job: String?
      var label: URL
      var merits: String?
      var moveSpeed: Int
      var name: String
      var previewStats: PreviewStat
      var race: String?
      var releaseDate: String
      var releaseNote: String?
      var shift: String?
      var shiftID: Int
      var skillCount: Int
      var skills: String?
      var type: String
      var weapon: String?
      var weight: String?

    init(age: String? = nil, aidisID: Int, ailmentResist: AilmentResist, attributeBoard: String, attributeInnate: String, attributeResist: [AttributeResist], availability: String, avatar: URL, birthday: String? = nil, category: String, critRate: String, demerits: String? = nil, equipment: [String], faintPoint: Int, from: String? = nil, gender: String, gender1: String, habits: String? = nil, hasShift: Bool, height: String? = nil, hobbies: String? = nil, icon: URL, id: Int, job: String? = nil, label: URL, merits: String? = nil, moveSpeed: Int, name: String, previewStats: PreviewStat, race: String? = nil, releaseDate: String, releaseNote: String? = nil, shift: String? = nil, shiftID: Int, skillCount: Int, skills: String? = nil, type: String, weapon: String? = nil, weight: String? = nil) {
        self.age = age
        self.aidisID = aidisID
        self.ailmentResist = ailmentResist
        self.attributeBoard = attributeBoard
        self.attributeInnate = attributeInnate
        self.attributeResist = attributeResist
        self.availability = availability
        self.avatar = avatar
        self.birthday = birthday
        self.category = category
        self.critRate = critRate
        self.demerits = demerits
        self.equipment = equipment
        self.faintPoint = faintPoint
        self.from = from
        self.gender = gender
        self.gender1 = gender1
        self.habits = habits
        self.hasShift = hasShift
        self.height = height
        self.hobbies = hobbies
        self.icon = icon
        self.id = id
        self.job = job
        self.label = label
        self.merits = merits
        self.moveSpeed = moveSpeed
        self.name = name
        self.previewStats = previewStats
        self.race = race
        self.releaseDate = releaseDate
        self.releaseNote = releaseNote
        self.shift = shift
        self.shiftID = shiftID
        self.skillCount = skillCount
        self.skills = skills
        self.type = type
        self.weapon = weapon
        self.weight = weight
    }

    required init(from decoder: Decoder) throws {
        let container = try decoder.container(keyedBy: CodingKeys.self)
        age = try container.decode(String.self, forKey: .age)
        aidisID = try container.decode(Int.self, forKey: .aidisID)
        ailmentResist = try container.decode(AilmentResist.self, forKey: .ailmentResist)
        attributeBoard = try container.decode(String.self, forKey: .attributeBoard)
        attributeResist = try container.decode([Unit.AttributeResist].self, forKey: .attributeResist)
        availability = try container.decode(String.self, forKey: .availability)
        avatar = try container.decode(URL.self, forKey: .avatar)
        birthday = try container.decode(String.self, forKey: .birthday)
        category = try container.decode(String.self, forKey: .category)
        critRate = try container.decode(String.self, forKey: .critRate)
        demerits = try container.decode(String.self, forKey: .demerits)
        equipment = try container.decode([String].self, forKey: .equipment)
        faintPoint = try container.decode(Int.self, forKey: .faintPoint)
        from = try container.decode(String.self, forKey: .from)
        gender = try container.decode(String.self, forKey: .gender)
        gender1 = try container.decode(String.self, forKey: .gender1)
        habits = try container.decode(String.self, forKey: .habits)
        hasShift = try container.decode(Bool.self, forKey: .hasShift)
        height = try container.decode(String.self, forKey: .height)
        icon = try container.decode(URL.self, forKey: .icon)
        id = try container.decode(Int.self, forKey: .id)
        job = try container.decode(String.self, forKey: .job)
        label = try container.decode(URL.self, forKey: .label)
        merits = try container.decode(String.self, forKey: .merits)
        moveSpeed = try container.decode(Int.self, forKey: .moveSpeed)
        name = try container.decode(String.self, forKey: .name)
        previewStats = try container.decode(PreviewStat.self, forKey: .previewStats)
        race = try container.decode(String.self, forKey: .race)
        releaseDate = try container.decode(String.self, forKey: .releaseDate)
        releaseNote = try container.decode(String.self, forKey: .releaseNote)
        shift = try container.decode(String.self, forKey: .shift)
        shiftID = try container.decode(Int.self, forKey: .shiftID)
        skillCount = try container.decode(Int.self, forKey: .skillCount)
        skills = try container.decode(String.self, forKey: .skills)
        type = try container.decode(String.self, forKey: .type)
        weapon = try container.decode(String.self, forKey: .weapon)
        weight = try container.decode(String.self, forKey: .weight)
    }

    func encode(to encoder: Encoder) throws {
        var container = encoder.container(keyedBy: CodingKeys.self)
        try container.encode(age, forKey: .age)
        try container.encode(aidisID, forKey: .aidisID)
        try container.encode(ailmentResist, forKey: .ailmentResist)
        try container.encode(attributeBoard, forKey: .attributeBoard)
        try container.encode(attributeResist, forKey: .attributeResist)
        try container.encode(availability, forKey: .availability)
        try container.encode(avatar, forKey: .avatar)
        try container.encode(birthday, forKey: .birthday)
        try container.encode(category, forKey: .category)
        try container.encode(critRate, forKey: .critRate)
        try container.encode(demerits, forKey: .demerits)
        try container.encode(equipment, forKey: .equipment)
        try container.encode(faintPoint, forKey: .faintPoint)
        try container.encode(from, forKey: .from)
        try container.encode(gender, forKey: .gender)
        try container.encode(gender1, forKey: .gender1)
        try container.encode(habits, forKey: .habits)
        try container.encode(hasShift, forKey: .hasShift)
        try container.encode(height, forKey: .height)
        try container.encode(icon, forKey: .icon)
        try container.encode(id, forKey: .id)
        try container.encode(job, forKey: .job)
        try container.encode(label, forKey: .label)
        try container.encode(merits, forKey: .merits)
        try container.encode(moveSpeed, forKey: .moveSpeed)
        try container.encode(name, forKey: .name)
        try container.encode(previewStats, forKey: .previewStats)
        try container.encode(race, forKey: .race)
        try container.encode(releaseDate, forKey: .releaseDate)
        try container.encode(releaseNote, forKey: .releaseNote)
        try container.encode(shift, forKey: .shift)
        try container.encode(shiftID, forKey: .shiftID)
        try container.encode(skillCount, forKey: .skillCount)
        try container.encode(skills, forKey: .skills)
        try container.encode(type, forKey: .type)
        try container.encode(weapon, forKey: .weapon)
        try container.encode(weight, forKey: .weight)
    }
}

extension Unit {
  class PreviewStat: Codable {
    var def: Int
    var hp: Int
    var int: Int
    var mnd: Int
    var mp: Int
    var str: Int
  }
}

extension Unit {
  class AttributeResist: Codable {
    var dark: Int
    var earth: Int
    var fire: Int
    var ice: Int
    var light: Int
    var thunder: Int
  }
}

extension Unit {
  class AilmentResist: Codable {
    var blind: Int
    var curse: Int
    var illness: Int
    var poison: Int
    var silence: Int
    var stun: Int
  }
}

However I am getting the error "Return from initializer without initializing all stored properties". Any ideas?