Question

我正在开发的应用程序是关于在线食品订单。餐馆老板在他/她的餐厅列出该餐厅提供的菜单。我为这种情况设计了模型。但我在我的评论模型中遇到问题，我收到NameError的错误：name＆＃39; Restaurant＆＃39;导入Restaurant类时未定义。

代码

餐馆/ models.py

class Restaurant(models.Model):
    OPEN = 1
    CLOSED = 2

    OPENING_STATUS = (
        (OPEN, 'open'),
        (CLOSED, 'closed'),
        )
    owner = models.ForeignKey(User)
    name = models.CharField(max_length=150, db_index=True)
    slug = models.SlugField(max_length=150, db_index=True)
    address = models.CharField(max_length=100)
    city = models.CharField(max_length=100)
    phone_number = models.PositiveIntegerField()
    owner_email = models.EmailField()
    opening_status = models.IntegerField(choices=OPENING_STATUS, default=OPEN)
    website = models.URLField(max_length=300)
    features = models.ManyToManyField(Choice, related_name="restaurants_features")
    timings = models.ManyToManyField(Choice, related_name="restaurants_timings")
    opening_from = models.TimeField()
    opening_to = models.TimeField()
    facebook_page = models.URLField(max_length=200)
    twitter_handle = models.CharField(max_length=15, blank=True, null=True)
    other_details = models.TextField()
    # votes = models.IntegerField(choices=STARS, default=5)


class Menu(models.Model):
    STARS = (
        (1, 'one'),
        (2, 'two'),
        (3, 'three'),
        (4, 'four'),
        (5, 'five'),
    )
    menu_category = models.ForeignKey(Category, related_name="menu")
    restaurant = models.ForeignKey(Restaurant)
    name = models.CharField(max_length=120,db_index=True)
    slug = models.SlugField(max_length=120,db_index=True)
    image = models.ImageField(upload_to='products/%Y/%m/%d', blank=True)
    description = models.TextField(blank=True)
    price = models.DecimalField(max_digits=10,decimal_places=2)
    stock = models.PositiveIntegerField()
    vote = models.SmallIntegerField(choices=STARS, default=5)

查看/ models.py

from restaurants.models import Restaurant # I am getting an error here


class Review(models.Model):
    STARS = (
            (1, 'one'),
            (2, 'two'),
            (3, 'three'),
            (4, 'four'),
            (5, 'five'),
        )
    vote = models.SmallIntegerField(choices=STARS, default=5)
    user = models.ForeignKey(User)
    restaurant = models.ForeignKey(Restaurant)
    review = models.TextField()
    created = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField(auto_now=True)

    def __str__(self):
        return self.vote

为什么我会收到这样的错误？

还有一个问题。餐厅有多种菜单。用户应该对每个菜单进行评分（仅评分无评论）。那么我的模型可以用于这样的功能吗？

Answer 1

您可能有一个循环导入错误;模型文件试图互相导入，Python无法解决它。

请注意，如果您要做的只是定义关系，则无需导入实际模型;你可以使用字符串值代替。从review.models中删除导入，并在定义中执行此操作：

restaurant = models.ForeignKey('restaurant.Restaurant')

Answer 2

您需要将餐馆的完整路径添加到系统路径

在review / models.py

中添加以下代码

import sys
sys.path.append('<full path to parent dir of restaurants>')

from restaurants.models import Restaurant

ImportError：name＆＃39; Restaurant＆＃39;没有定义

2 个答案: