Refactor storage model to work with native Realm

ios/App/Shared/models/server/Metadata.swift

@@ -0,0 +1,108 @@
+//
+//  Metadata.swift
+//  App
+//
+//  Created by Ron Heft on 8/16/22.
+//
+
+import Foundation
+import RealmSwift
+
+class Metadata: EmbeddedObject, Codable {
+    @Persisted var title: String = "Unknown"
+    @Persisted var subtitle: String?
+    @Persisted var authors = List<Author>()
+    @Persisted var narrators = List<String>()
+    @Persisted var genres = List<String>()
+    @Persisted var publishedYear: String?
+    @Persisted var publishedDate: String?
+    @Persisted var publisher: String?
+    @Persisted var desc: String?
+    @Persisted var isbn: String?
+    @Persisted var asin: String?
+    @Persisted var language: String?
+    @Persisted var explicit: Bool = false
+    @Persisted var authorName: String?
+    @Persisted var authorNameLF: String?
+    @Persisted var narratorName: String?
+    @Persisted var seriesName: String?
+    @Persisted var feedUrl: String?
+    
+    var authorDisplayName: String { self.authorName ?? "Unknown" }
+    
+    private enum CodingKeys : String, CodingKey {
+        case title,
+             subtitle,
+             authors,
+             narrators,
+             genres,
+             publishedYear,
+             publishedDate,
+             publisher,
+             desc = "description", // Fixes a collision with the base Swift object's field "description"
+             isbn,
+             asin,
+             language,
+             explicit,
+             authorName,
+             authorNameLF,
+             narratorName,
+             seriesName,
+             feedUrl
+    }
+    
+    override init() {
+        super.init()
+    }
+    
+    required init(from decoder: Decoder) throws {
+        super.init()
+        let values = try decoder.container(keyedBy: CodingKeys.self)
+        title = try values.decode(String.self, forKey: .title)
+        subtitle = try? values.decode(String.self, forKey: .subtitle)
+        if let authorList = try? values.decode([Author].self, forKey: .authors) {
+            authors.append(objectsIn: authorList)
+        }
+        if let narratorList = try? values.decode([String].self, forKey: .narrators) {
+            narrators.append(objectsIn: narratorList)
+        }
+        if let genreList = try? values.decode([String].self, forKey: .genres) {
+            genres.append(objectsIn: genreList)
+        }
+        publishedYear = try? values.decode(String.self, forKey: .publishedYear)
+        publishedDate = try? values.decode(String.self, forKey: .publishedDate)
+        publisher = try? values.decode(String.self, forKey: .publisher)
+        desc = try? values.decode(String.self, forKey: .desc)
+        isbn = try? values.decode(String.self, forKey: .isbn)
+        asin = try? values.decode(String.self, forKey: .asin)
+        language = try? values.decode(String.self, forKey: .language)
+        explicit = try values.decode(Bool.self, forKey: .explicit)
+        authorName = try? values.decode(String.self, forKey: .authorName)
+        authorNameLF = try? values.decode(String.self, forKey: .authorNameLF)
+        narratorName = try? values.decode(String.self, forKey: .narratorName)
+        seriesName = try? values.decode(String.self, forKey: .seriesName)
+        feedUrl = try? values.decode(String.self, forKey: .feedUrl)
+    }
+    
+    func encode(to encoder: Encoder) throws {
+        var container = encoder.container(keyedBy: CodingKeys.self)
+        try container.encode(title, forKey: .title)
+        try container.encode(subtitle, forKey: .subtitle)
+        try container.encode(Array(authors), forKey: .authors)
+        try container.encode(Array(narrators), forKey: .narrators)
+        try container.encode(Array(genres), forKey: .genres)
+        try container.encode(publishedYear, forKey: .publishedYear)
+        try container.encode(publishedDate, forKey: .publishedDate)
+        try container.encode(publisher, forKey: .publisher)
+        try container.encode(desc, forKey: .desc)
+        try container.encode(isbn, forKey: .isbn)
+        try container.encode(asin, forKey: .asin)
+        try container.encode(language, forKey: .language)
+        try container.encode(explicit, forKey: .explicit)
+        try container.encode(authorName, forKey: .authorName)
+        try container.encode(authorNameLF, forKey: .authorNameLF)
+        try container.encode(narratorName, forKey: .narratorName)
+        try container.encode(seriesName, forKey: .seriesName)
+        try container.encode(feedUrl, forKey: .feedUrl)
+    }
+}