[F] Fix "Attempt to insert non-property list object"

ProjectClock/AccountViewController.swift

@@ -102,7 +102,7 @@ class LoginVC: UIViewController
             
             send(APIs.familyGet)
             {
-                localStorage["family"] = $0
+                $0.localSave()
                 self.loginSuccess(login)
             }
             err: { it in self.loginSuccess(login) }
@@ -280,7 +280,7 @@ class FamilyCreateJoinVC: UIViewController
             sendReq(APIs.familyCreate, title: "Creating...", params: ["name": name, "pin": pin])
             {
                 // Save
-                localStorage["family"] = $0
+                $0.localSave()
                 
                 // Send success message
                 self.msg("Created!", "Your family ID is \($0.fid)")

ProjectClock/Models.swift

@@ -14,6 +14,19 @@ struct Family: Codable
     var name: String
     var members: String
     // And a hidden field: admin pin
+    
+    /// Save family to local storage
+    func localSave()
+    {
+        localStorage.setValue(JSON.stringify(self)!, forKey: "family")
+    }
+    
+    /// Read family object from local storage
+    static func fromLocal() -> Family?
+    {
+        guard let f = localStorage.string(forKey: "family") else { return nil }
+        return JSON.parse(Family.self, f)
+    }
 }
 
 struct WVM: Codable