问题描述
我试图通过book调用图像 url，这是我的模型：
class Book(models.Model):
users = models.ManyToManyField(User)
creation_date = models.DateTimeField(default = timezone.now)
published_date = models.DateTimeField(default = timezone.now)
isbn = models.CharField(max_length = 200)
class PhotoBook(models.Model):
book = models.ForeignKey(Book, on_delete= models.CASCADE, related_name="photos")
image = models.ImageField(upload_to = "cover_page", blank = True, null = True)
这是我的serializer.py
class BookSerializer(serializers.HyperlinkedModelSerializer):
users = UserSerializer(many = True, read_only = True)
photos = serializers.StringRelatedField(many=True)
published_date = serializers.DateTimeField(format="%Y-%m-%d", input_formats=None)
class Meta:
model = Book
fields = ("published_date" , "photos", "users", "isbn", "title_book",
"cover_page", "pages" ,"copies", "description", "subtitle")
当然我正在尝试使用serializer.StringRelatedField但只得到一个文本数组，说明这是一个Photobook类型的对象。
问题是，知道foreing_key在 PhotoBook 对象中，如何在序列化程序中获取图像数组。
1楼
您可以使用来实现您的需要：
class BookSerializer(serializers.HyperlinkedModelSerializer):
photos = serializers.SerializerMethodField()
class Meta:
model = Book
fields = ("published_date" , "photos", "users", "isbn", "title_book",
"cover_page", "pages" ,"copies", "description", "subtitle")
def get_photos(self, obj):
# photos = obj.photos.all()
# This work better for me, because Books objects doesn?t have
# the attribute photos, but PhotoBooks, contain the ```book_id```
photos = PhotoBook.objects.filter(book=obj.id)
return [photo.image.url for photo in photos]