barely functional database with hive

android/app/build.gradle

@@ -45,7 +45,7 @@ android {
         applicationId "com.example.rezepte"
         // You can update the following values to match your application needs.
         // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration.
-        minSdkVersion flutter.minSdkVersion
+        minSdkVersion 23
         targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName

lib/main.dart

@@ -6,9 +6,12 @@ import 'package:rezepte/services/providers/recipe_list_provider.dart';
 import 'package:rezepte/services/providers/recipe_provider.dart';
 
 import 'pages/recipe_detail_page.dart';
+import 'services/providers/db/dbhelper.dart';
 import 'theme.dart';
 
-void main() {
+void main() async {
+  WidgetsFlutterBinding.ensureInitialized();
+  await DbHelper.init();
   runApp(MultiProvider(providers: [
     ChangeNotifierProvider(
       create: (_) => RecipeListProvider(),

lib/models/cooking_step.dart

@@ -3,4 +3,14 @@ class CookingStep {
   final String description;
 
   CookingStep({required this.title, this.description = ''});
+
+  factory CookingStep.fromJson(Map<String, dynamic> json) => CookingStep(
+        title: json['title'] as String,
+        description: json['description'] as String,
+      );
+
+  Map<String, dynamic> toJson() => {
+        'title': title,
+        'description': description,
+      };
 }

lib/models/ingredient.dart

@@ -11,6 +11,18 @@ class Ingredient {
     this.preferredBrands = const [],
   });
 
+  factory Ingredient.fromJson(Map<String, dynamic> json) => Ingredient(
+        title: json['title'] as String,
+        possibleUnits: _unitsFromJson(json['possibleUnits']),
+        preferredBrands: json['preferredBrands'] as List<String>,
+      );
+
+  Map<String, dynamic> toJson() => {
+        'title': title,
+        'possibleUnits': possibleUnits.map((e) => e.toJson()).toList(),
+        'preferredBrands': preferredBrands,
+      };
+
   @override
   bool operator ==(other) {
     Ingredient i = other as Ingredient;
@@ -21,4 +33,7 @@ class Ingredient {
   int get hashCode {
     return Object.hash(title, null);
   }
+
+  static List<Unit> _unitsFromJson(List<Map<String, dynamic>> jsonList) =>
+      jsonList.map((e) => Unit.fromJson(e)).toList();
 }

lib/models/ingredient_list_entry.dart

@@ -9,6 +9,21 @@ class IngredientListEntry {
 
   IngredientListEntry(this.ingredient, this.amount, this.unit, this.optional);
 
+  factory IngredientListEntry.fromJson(Map<String, dynamic> json) =>
+      IngredientListEntry(
+        Ingredient.fromJson(json['ingredient']),
+        json['amount'] as int,
+        Unit.fromJson(json['unit']),
+        json['optional'] as bool,
+      );
+
+  Map<String, dynamic> toJson() => {
+        'ingredient': ingredient.toJson(),
+        'amount': amount,
+        'unit': unit.toJson(),
+        'optional': optional,
+      };
+
   @override
   operator ==(Object other) {
     final i = other as IngredientListEntry;

lib/models/recipe.dart

@@ -6,8 +6,8 @@ class Recipe {
   String title;
   String description;
   Difficulty? difficulty;
-  final List<IngredientListEntry> ingredients = [];
+  List<IngredientListEntry> ingredients = [];
-  final List<CookingStep> steps = [];
+  List<CookingStep> steps = [];
 
   Recipe({
     required this.title,
@@ -15,6 +15,23 @@ class Recipe {
     this.difficulty,
   });
 
+  factory Recipe.fromJson(json) => Recipe(
+        title: json['title'] as String,
+        description: json['description'] as String,
+        // difficulty: json['difficulty'] as Difficulty?,
+      );
+  // ..ingredients = _ingredientsFromMap(
+  //     json['ingredients'] as List<Map<String, dynamic>>)
+  // ..steps = _stepsFromMap(json['steps']);
+
+  Map<String, dynamic> toJson() => {
+        'title': title,
+        'description': description,
+        // 'difficulty': difficulty,
+        // 'ingredients': ingredients.map((e) => e.toJson()).toList(),
+        // 'steps': steps.map((e) => e.toJson()).toList(),
+      };
+
   void addIngredient(IngredientListEntry ingredient) =>
       ingredients.add(ingredient);
 
@@ -51,4 +68,11 @@ class Recipe {
     ingredients.clear();
     steps.clear();
   }
+
+  static List<IngredientListEntry> _ingredientsFromMap(
+          List<Map<String, dynamic>> jsonList) =>
+      jsonList.map((e) => IngredientListEntry.fromJson(e)).toList();
+
+  static List<CookingStep> _stepsFromMap(List<Map<String, dynamic>> jsonList) =>
+      jsonList.map((e) => CookingStep.fromJson(e)).toList();
 }

lib/models/unit.dart

@@ -4,6 +4,18 @@ class Unit {
   final System system;
 
   Unit(this.name, this.type, {this.system = System.metric});
+
+  factory Unit.fromJson(Map<String, dynamic> json) => Unit(
+        json['name'] as String,
+        json['type'] as UnitType,
+        system: json['system'] as System,
+      );
+
+  Map<String, dynamic> toJson() => {
+        'name': name,
+        'type': type,
+        'system': system,
+      };
 }
 
 enum System { metric, imperial, neutral }

lib/services/providers/db/dbhelper.dart

@@ -0,0 +1,29 @@
+import 'package:hive/hive.dart';
+import 'package:path_provider/path_provider.dart';
+
+import '../../../models/recipe.dart';
+import '../../../example_data.dart' as e;
+
+class DbHelper {
+  static Box<Recipe> get _recipesBox => Hive.box(name: 'recipes');
+
+  static Future<void> init() async {
+    final dir = await getApplicationDocumentsDirectory();
+    Hive.defaultDirectory = dir.path;
+    Hive.registerAdapter('Recipe', Recipe.fromJson);
+    _recipesBox.clear();
+    for (final recipe in e.exampleRecipes) {
+      insertRecipe(recipe);
+    }
+  }
+
+  static List<Recipe> fetchRecipes() {
+    List<Recipe> recipes = _recipesBox.getAll(['0', '1']).cast<Recipe>();
+
+    return recipes;
+  }
+
+  static void insertRecipe(Recipe recipe) {
+    _recipesBox.put(_recipesBox.length.toString(), recipe);
+  }
+}

lib/services/providers/recipe_list_provider.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/foundation.dart';
+import 'package:rezepte/services/providers/db/dbhelper.dart';
 
 import '../../models/recipe.dart';
 import 'package:rezepte/example_data.dart' as e;
@@ -12,7 +13,7 @@ class RecipeListProvider extends ChangeNotifier {
     notifyListeners();
   }
 
-  List<Recipe> get recipes => _recipes;
+  List<Recipe> get recipes => DbHelper.fetchRecipes();
 
   void clearRecipes({silent = false}) {
     _recipes.clear();