How to create a List of Object in Back4App? - flutter

Question

I'm using back4app in my application and I have a class like this called Meal:
and this is my code snippet :
class EatenMeals with ChangeNotifier {
List<Meal> _eatenMeals = [];
List<Meal> get eatenMeals {
return [..._eatenMeals];
}
void addMeal(Meal meal) {
var newMeal = Meal(
id: meal.id,
cal: meal.cal,
catId: meal.catId,
title: meal.title,
duration: meal.duration,
affordability: meal.affordability,
imageUrl: meal.imageUrl,
ingredients: meal.ingredients,
isBreakfast: meal.isDinner,
isDinner: meal.isDinner,
isLunch: meal.isLunch,
steps: meal.steps);
_eatenMeals.add(newMeal);
}
}
Now I want to create a class that contain list of Meals object.
and attach to users how do I achieve this?

Answer 1

Checkout Parse Server Custom Objects. Here is an example for your case how to create a Custom Object for Meal.
class Meal extends ParseObject implements ParseCloneable {
Meal() : super(_keyTableName);
Meal.clone() : this();
/// Looks strangely hacky but due to Flutter not using reflection, we have to
/// mimic a clone
#override
clone(Map map) => Meal.clone()..fromJson(map);
/// Colum names
static const String _keyTableName = 'Meal';
static const String keyCatId = 'catId';
static const String keyTitle = 'title';
static const String keyImgUrl = 'imgUrl';
static const String keyIngredients = 'ingredients';
static const String keySteps = 'steps';
static const String keyCalorie = 'calorie';
static const String keyDuration = 'duration';
static const String keyAffordability = 'affordability';
static const String keyIsBreakfast = 'isBreakfast';
static const String keyIsLunch = 'isLunch';
static const String keyIsDinner = 'isDinner';
/// Getter & Setters
List<String> get catId => get<List<String>>(keyCatId);
set name(List<String> catId) => set<List<String>>(keyCatId, catId);
String get title => get<String>(keyTitle);
set title(String title) => set<String>(keyTitle, title);
Strin> get imgUrl => get<String>(keyImgUrl);
set imgUrl(String imgUrl) => set<String>(keyImgUrl, imgUrl);
List<String> get ingredients => get<List<String>>(keyIngredients);
set ingredients(List<String> ingredients) => set<List<String>>(keyIngredients, ingredients);
List<String> get steps => get<List<String>>(keySteps);
set steps(List<String> steps) => set<List<String>>(keySteps, steps);
num get calorie => get<num>(keyCalorie);
set calorie(num calorie) => set<num>(keyCalorie, calorie);
num get duration => get<num>(keyDuration);
set affordability(num duration) => set<num>(keyDuration, duration);
String get affordability => get<String>(keyAffordability);
set name(String affordability) => set<String>(keyAffordability, affordability);
bool get isBreakfast => get<bool>(keyIsBreakfast);
set isBreakfast(bool isBreakfast) => set<bool>(keyIsBreakfast, isBreakfast);
bool get isLunch => get<bool>(keyIsLunch);
set isLunch(bool isLunch) => set<bool>(keyIsLunch, isLunch);
bool get isDinner => get<bool>(keyIsDinner);
set isDinner(bool isDinner) => set<bool>(keyIsDinner, isDinner);
}
Then you have to register this subclass.
Parse().initialize(
...,
registeredSubClassMap: <String, ParseObjectConstructor>{
'Meal': () => Meal(),
},
);