餐厅、膳食和膳食类别的模型设计

Question

我正计划开发一款本地餐馆的送餐应用。我正在考虑最好的设计。我也为 API 建模设计了一个 json。但是我对菜单部分感到困惑。应该在餐厅用餐作为外键或餐厅在用餐中作为外键。

我的应用程序的简单概念是

一家餐厅准备各种餐点，为不同类型的顾客提供服务。一顿饭与类别相关联，例如一顿饭可以是蔬菜，也可以是非蔬菜。客户（用户）也可以点饮料。

我的模型设计和api设计适合这种场景吗？

class Restaurant(models.Model):
    name = models.CharField()
    slug = models.SlugField()
    owner = models.ForeignKey(User)
    location = models.CharField()
    city = models.CharField()
    features = models.ManyToManyField(FeatureChoice) # dinner, launch, nightlife,
    timing = models.ManyToManyField(TimingChoice) # sunday, monday, tuesday, 
    is_delivery = models.BooleanField(default=True)
    # meal = models.ForeignKey(Meal) main confusion is here


class Meal(models.Model):
    restaurant = models.ForeignKey(User)
    name = models.CharField()
    price = models.FloatField()
    quantity = models.PositiveIntegerField()
    image = models.ImageField()
    rating = models.IntegerField()


class MealCategory(models.Model)
    meal = models.ForeignKey(Meal)
    name = models.CharField()
    slug = models.SlugField()

REST API 的 json 设计

[
        {
            'name':'Kathmandu Fast Food',
            'owner':'Sanskar Shrestha',
            'location':'Koteshwor',
            'city':'Kathmandu',
            'features':[
                {
                    'features':'Breakfast'
                },

                {
                    'features':'Launch'
                },

                {
                    'features':'NightLife'
                },

            ],

            'timings':[
                {
                    'timing':'MOnday'
                },

                {
                    'timing':'Sunday'
                },
            ],

            'is_delivery':'true',
            'menu':[
                {
                    'name':'Chicken BBQ',
                    'price':990,
                    'quantity':10,
                    'image':'localhost:8000/media/.../',
                    'category':{
                        'name':'Non-veg'
                    }
                },

                {
                    'name':'Veg Chowmin',
                    'price':160,
                    'quantity':20,
                    'image':'localhost:8000/media/',
                    'category':
                        {
                            'name':'Veg'
                        }
                }
            ]
        }
]

请分享您的专业知识。

Answer 1

Meal 应该将 MealCategory 作为 ForeignKey。我认为Meal是一个应该独立于餐厅的模型。考虑添加另一个模型

class RestaurantMeal(models.Model):
    restaurant = models.ForeignKey(Restaurant)
    meal = models.ForeignKey(Meal)

存储有关特定餐厅用餐的数据。

Answer 2

1. 当你应该有restaurant = models.ForeignKey('Restaurant')时，为什么你在Meal模型中有restaurant = models.ForeignKey(User)
2. MealCategory应该是独立的，不属于Meal，相反，Meal应该属于MealCategory。
3. price 字段应为 Decimal

4. 为什么rating 是整数？你见过评级曾经是整数吗？只有一个人评价它才是整数。

   class Meal(models.Model):
       restaurant = models.ForeignKey('Restaurant')
       name = models.CharField()
       price = models.DecimalField()
       quantity = models.PositiveIntegerField()
       image = models.ImageField()
       rating = models.FloatField()
       meal_category = models.ForeignKey('MealCategory')
   
   
   class MealCategory(models.Model):
       name = models.CharField()
       slug = models.SlugField()