🧑‍💻 🔥 Decouple Data/UnitsStore

Graduator/Graduator.xcodeproj/project.pbxproj

@@ -117,7 +117,6 @@
 		EC8BAD142A34650D0062226B /* Data */ = {
 			isa = PBXGroup;
 			children = (
-				EC242B822A1FAA9B006FE760 /* Stub.swift */,
 				EC8BAD152A3465230062226B /* UnitsStore.swift */,
 			);
 			path = Data;
@@ -184,6 +183,7 @@
 		ECE6E3C02A1F80F6004FE471 /* Model */ = {
 			isa = PBXGroup;
 			children = (
+				EC242B822A1FAA9B006FE760 /* Stub.swift */,
 				EC242B6B2A1F81AE006FE760 /* Subject.swift */,
 				EC242B692A1F8189006FE760 /* Unit.swift */,
 				EC242B6D2A1F81CC006FE760 /* UnitsManager.swift */,

Graduator/Graduator/Data/UnitsStore.swift

@@ -9,41 +9,35 @@ import SwiftUI
 
 
 class UnitsStore: ObservableObject {
-    
-    var units: [Unit] = []
-    
+        
     private static func fileURL() throws -> URL {
         try FileManager.default.url(
             for: .documentDirectory,
             in: .userDomainMask,
             appropriateFor: nil,
             create: false
-        ).appendingPathComponent("units.data")
+        ).appendingPathComponent("my.data")
     }
     
-    func load() async throws -> [Unit] {
-        
-        let task = Task<[Unit], Error> {
+    func load<T: Codable>(defaultValue: [T]) async throws -> [T] {
+            
+        let task = Task<[T], Error> {
             let fileURL = try Self.fileURL()
             let data = try? Data(contentsOf: fileURL)
-            var units: [Unit] = []
-            if (data == nil || data!.isEmpty) {
-                units = Stub.units
-            }
-            else if (data != nil) {
-                units = try JSONDecoder().decode([Unit].self, from: data!)
+            var elements: [T] = defaultValue
+            if let validData = data, !validData.isEmpty {
+                elements = try JSONDecoder().decode([T].self, from: validData)
             }
-            return units
+            return elements
         }
         
-        self.units = try await task.value
-        return self.units
+        return try await task.value
     }
     
-    func save(units: [Unit]) async throws {
+    func save<T: Codable>(elements: [T]) async throws {
         
         let task = Task {
-            let data = try JSONEncoder().encode(units)
+            let data = try JSONEncoder().encode(elements)
             let outfile = try Self.fileURL()
             try data.write(to: outfile)
         }

Graduator/Graduator/Model/UnitsManager.swift

@@ -19,7 +19,7 @@ struct UnitsManager {
     
     mutating func load() async throws {
         do {
-            self.units = try await store.load()
+            self.units = try await store.load(defaultValue: Stub.units)
         } catch {
             // DEV: this should be replaced with proper error handling before ever going to prod
             print("ERROR: Failed to load...")
@@ -28,7 +28,7 @@ struct UnitsManager {
     
     func save() async throws {
         do {
-            try await store.save(units: units)
+            try await store.save(elements: units)
         } catch {
             // DEV: this should be replaced with proper error handling before ever going to prod
             print("ERROR: Failed to save...")