@Entity()
  class Info {
    @SafeType({ type: Number })
    age?: Number
    @SafeType({ type: Number })
    numbers?: Number[]
    showAge() {
      console.log(`i'm ${this.age}`)
    }
  }

  @Entity()
  class User {
    @SafeType({ type: String })
    name?: String
    @SafeType({ type: Info })
    info?: Info
    constructor(obj: any) {}
  }

  const model = { 
    name: "1", 
    info: { 
        age: '1', 
        numbers: [1, 2, "3"] 
      } 
  }

  const user = new User(model)

  user.info.showAge()

  @Entity()
    class Location {
        code: string = ''
        constructor(model: any) {}
        getLocation = () => `My location is ${this.code}`
    }
    @Entity()
    class User {
        @Transform({fn: (model: any, field: string) => model[field] 
            && model[field]
            .split(',')
            .map((code: string) => ({
                code
            }))})
        @SafeType({type: Location})
        locations: Location[] = []
        constructor(model: any) {}
    }