英文:
How do I create a serializer for one to many (Foreign key) relationship?
问题
我的模型是：
class Posts(models.Model):
user = models.ForeignKey(User, related_name='user_posts', on_delete=models.CASCADE, null=True, blank=True)
###其他字段
和
class PostsMedia(models.Model):
post = models.ForeignKey(Posts, related_name='post_media', on_delete=models.CASCADE, null=True, blank=True)
media = models.URLField(max_length=500, null=True, blank=True)
英文:
I have to upload multiple images and save their URLs. A number of images can be uploaded but the post will be one, similarly for other posts also. I have created the models but I don't know how to create the serializer for it.
My models are:
class Posts(models.Model):
user = models.ForeignKey(User, related_name='user_posts', on_delete=models.CASCADE, null=True, blank=True)
###other fields
And
class PostsMedia(models.Model):
post = models.ForeignKey(Posts, related_name='post_media', on_delete=models.CASCADE, null=True, blank=True)
media = models.URLField(max_length = 500, null=True, blank=True)
答案1
得分: 1
你可以为你的PostsMedia模型创建一个序列化器，以允许上传多个图片并保存它们的URL，如下所示：
class PostsMediaSerializer(serializers.ModelSerializer):
class Meta:
model = PostsMedia
fields = ('id', 'media')
class PostsSerializer(serializers.ModelSerializer):
post_media = PostsMediaSerializer(many=True, required=False)
class Meta:
model = Posts
fields = ('id', 'user', 'post_media', '__all__')
def create(self, validated_data):
post_media_data = validated_data.pop('post_media', [])
post = super().create(validated_data)
for one_media_data in post_media_data:
PostsMedia.objects.create(post=post, **one_media_data)
return post
create() 方法被用来从验证过的数据中提取post_media数据。
注意：在Django中，模型不需要添加
s作为后缀，因为它默认包含在内。所以最好将Posts改为Post。
英文:
You can create a serializer for your PostsMedia model to allow for uploading multiple images and saving their URLs so:
class PostsMediaSerializer(serializers.ModelSerializer):
class Meta:
model = PostsMedia
fields = ('id', 'media')
class PostsSerializer(serializers.ModelSerializer):
post_media = PostsMediaSerializer(many=True, required=False)
class Meta:
model = Posts
fields = ('id', 'user', 'post_media', '__all__')
def create(self, validated_data):
post_media_data = validated_data.pop('post_media', [])
post = super().create(validated_data)
for one_media_data in post_media_data:
PostsMedia.objects.create(post=post, **one_media_data)
return post
create() method has been used to extract the post_media data from the validated data.
> Note: Models in [tag:django] don't require s to be added as suffix, since it is included by default. So it is better to change Posts to Post.
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