ios - How to structure one to many to many to many data structure Swift -


i'm having hard time figuring out how best map out data structure takes user, adds brands associated user, adds items of clothing , user's size (for brand's item of closing, user). 

class user {       var name: string       class brands : user {            var brandname: [string]            class itemandsize : brands {                var itemandsize: [string: int]           }       }  }

is there better way structure in swift? want able store , call user.brandname.itemandsize.

the best not create relationship using inheritance. relationship between people, objects , specs can solved mapping in table. in example below, separated 'item' 'sizing' because dictionary won't map user brand , item/sizing unless compose key concatenating primary keys:

struct user {     var id: int     var description: string }  struct brand {     var id: int     var description: string }  enum sizing {     case s, m, l, xl      var description : string {         switch self {             case .s: return "s";             case .m: return "m";             case .l: return "l";             case .xl: return "xl";         }     } }  enum clothing {     case pants, shorts, shirt, jacket      var description : string {         switch self {         case .pants: return "pants";         case .shorts: return "shorts";         case .shirt: return "shirt";         case .jacket: return "jacket";         }     } }  struct mapping {     var user: user     var brand: brand     var item: clothing     var size: sizing }  let users = [user(id: 1, description: "pierre"), user(id: 2, description: "paul"), user(id: 3, description: "jacques")] let brands = [brand(id: 1, description: "d&g"), brand(id: 2, description: "gucci"), brand(id: 3, description: "prada")]  let mappings = [mapping(user: users[0], brand: brands[1], item: .pants, size: .xl),     mapping(user: users[1], brand: brands[0], item: .jacket, size: .s)]   m in mappings {     var s = ",".join([m.user.description, m.brand.description, m.item.description, m.size.description])     println(s) }

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