Store feed.authors in ODB. Make Author Codable.

Frameworks/Account/Feed.swift

@@ -66,7 +66,22 @@ public final class Feed: DisplayNameProvider, UnreadCountProvider, Hashable {
 	}
 
 	public var name: String?
-	public var authors: Set<Author>?
+	public var authors: Set<Author>? {
+		get {
+			guard let authorsJSON = settingsTable.string(for: Key.authors) else {
+				return nil
+			}
+			return Author.authorsWithJSON(authorsJSON)
+		}
+		set {
+			if let authorsJSON = newValue?.json() {
+				settingsTable.setString(authorsJSON, for: Key.authors)
+			}
+			else {
+				settingsTable.setString(nil, for: Key.authors)
+			}
+		}
+	}
 
 	public var editedName: String? {
 		didSet {
@@ -148,10 +163,6 @@ public final class Feed: DisplayNameProvider, UnreadCountProvider, Hashable {
 		self.init(account: account, url: url, feedID: feedID)
 		self.name = dictionary[Key.name] as? String
 		self.editedName = dictionary[Key.editedName] as? String
-
-		if let authorsDiskArray = dictionary[Key.authors] as? [[String: Any]] {
-			self.authors = Author.authorsWithDiskArray(authorsDiskArray)
-		}
 	}
 
 	public static func isFeedDictionary(_ d: [String: Any]) -> Bool {
@@ -175,9 +186,6 @@ public final class Feed: DisplayNameProvider, UnreadCountProvider, Hashable {
 		if let editedName = editedName {
 			d[Key.editedName] = editedName
 		}
-		if let authorsArray = authors?.diskArray() {
-			d[Key.authors] = authorsArray
-		}
 
 		return d
 	}

Frameworks/Articles/Author.swift

@@ -8,7 +8,7 @@
 
 import Foundation
 
-public struct Author: Hashable {
+public struct Author: Codable, Hashable {
 
 	public let authorID: String // calculated
 	public let name: String?
@@ -73,6 +73,23 @@ public struct Author: Hashable {
 		return d
 	}
 
+	public static func authorsWithJSON(_ jsonString: String) -> Set<Author>? {
+		// This is JSON stored in the database, not the JSON Feed version of an author.
+		guard let data = jsonString.data(using: .utf8) else {
+			return nil
+		}
+
+		let decoder = JSONDecoder()
+		do {
+			let authors = try decoder.decode([Author].self, from: data)
+			return Set(authors)
+		}
+		catch {
+			assertionFailure("JSON representation of Author array could not be decoded: \(jsonString) error: \(error)")
+		}
+		return nil
+	}
+
 	public static func authorsWithDiskArray(_ diskArray: [[String: Any]]) -> Set<Author>? {
 
 		let authors = diskArray.compactMap { Author(dictionary: $0) }
@@ -89,4 +106,16 @@ extension Set where Element == Author {
 		}
 		return self.map{ $0.dictionary }
 	}
+
+	public func json() -> String? {
+		let encoder = JSONEncoder()
+		do {
+			let jsonData = try encoder.encode(Array(self))
+			return String(data: jsonData, encoding: .utf8)
+		}
+		catch {
+			assertionFailure("JSON representation of Author array could not be encoded: \(self) error: \(error)")
+		}
+		return nil
+	}
 }