Django - __str__返回非字符串(元组类型)

from django.db import models

class MyModel(models.Model):
    name = models.CharField(max_length=100)
    description = models.TextField()

    def __str__(self):
        # 错误的返回类型
        # return (self.name, self.description)

        # 正确的返回类型
        return f"{self.name} - {self.description}"

from django.db import models

class Book(models.Model):
    title = models.CharField(max_length=200)
    author = models.CharField(max_length=100)
    publication_date = models.DateField()

    def __str__(self):
        return f"{self.title} by {self.author} ({self.publication_date})"