在 DRF 序列化程序中包含特定的外键

Question

这里有两个简单的模型作为示例：

class Author(models.Model):
    name = models.CharField(blank=True, max_length=50)
    age = models.IntegerField(null=True, )

class Book(models.Model):
    title = models.CharField(max_length=100)
    author = models.ForeignKey(Author)
    date = models.DateField()

现在我想做的是为 Book 创建一个视图，使用 Django Rest Framework 从 Author 中提取其中一个值。这是一个例子 ModelSerializer:

class BookMetaSerializer(serializers.ModelSerializer):

class Meta:
    model = Book
    fields = ('title','date','author__name',)

问题是不能像我上面给出的那样访问 DRF 中外键的字段 author__name。我无法根据文档弄清楚如何执行此操作。感谢所有帮助，谢谢！

Answer 1

您可以使用source参数定义author_name字段来获取作者姓名。

来自 source argument:

上的 DRF 文档

The name of the attribute that will be used to populate the field. May be a method that only takes a self argument, such as URLField('get_absolute_url'), or may use dotted notation to traverse attributes, such as EmailField(source='user.email').

最终代码：

class BookMetaSerializer(serializers.ModelSerializer):

    # use dotted notation to traverse to 'name' attribute       
    author_name = serializers.CharField(source='author.name', read_only=True) 

    class Meta:
        model = Book
        fields = ('title','date','author_name',)

在 DRF 序列化程序中包含特定的外键

Include Specific Foreign Keys in DRF Serializer

django

django-rest-framework

foreign-key-relationship