限制在django休息框架中的外键选择 [英] Limit choices to foreignkey in django rest framework

问题描述

如何限制要与节点链接的request.user的图像。我希望我能做一些类似的事情：

  photo = models.ForeignKey（
 Image，
 limit_choices_to = {'owner'：username}，
）
  

但request.user而不是用户名和我不想使用本地线程。

models.py

  class Node（models.Model）：
 owner = models.ForeignKey（User）
 content = models.TextField（）
 photo = models.ForeignKey（Image）
 
 class Image（models.Model）：
 owner = models.ForeignKey（User）
 file = models.ImageField（upload_to = get_upload_file_name）
  pre> 
 
 
 serializers.py 
  class ImageSerializer（serializers.ModelSerializer） ：
 owner = serializers.Field（'owner.username'）
 
 class Meta：
 model = Image 
 fields =（'file'，'owner'） 
 
 class NodeSerializer（serializers.HyperlinkedModelSerializer）：
 
 cla ss元：
 model = Node 
 fields =（'content'，'photo'，'owner'）
  
 
 
解决方案
我将通过覆盖 get_serializer_class 来处理这个事件，以便在运行时动态返回一个串行化器类， 选项选项在该字段上：
  def get_serializer_class（s​​elf， ..）
 user = self.request.user 
 owner_choices = ...＃但是你想限制选项
 
 class ImageSerializer（serializers.ModelSerializer）：
 owner = serializers.Field（'owner.username'，choices = owner_choices）
 
 class Meta：
 model = Image 
 fields =（'file'，'owner' ）
 
 return ImageSerializer 
  
 
How to limit images of request.user to be linked with node. I wish I could do something like:
photo = models.ForeignKey(
    Image,
    limit_choices_to={'owner': username},
)
but request.user rather than username and I don't want to use local threads.

models.py
class Node(models.Model):
    owner = models.ForeignKey(User)
    content = models.TextField()
    photo = models.ForeignKey(Image)

class Image(models.Model):
    owner = models.ForeignKey(User)
    file = models.ImageField(upload_to=get_upload_file_name)
serializers.py
class ImageSerializer(serializers.ModelSerializer):
    owner = serializers.Field('owner.username')

    class Meta:
        model = Image
        fields = ('file', 'owner')

class NodeSerializer(serializers.HyperlinkedModelSerializer):

    class Meta:
        model = Node
        fields = ('content', 'photo', 'owner')

解决方案
I would deal with this by overriding get_serializer_class to dynamically return a serializer class at runtime, setting the choices option on the field there:
def get_serializer_class(self, ...):
    user = self.request.user
    owner_choices = ...  # However you want to restrict the choices

    class ImageSerializer(serializers.ModelSerializer):
        owner = serializers.Field('owner.username', choices=owner_choices)

        class Meta:
            model = Image
            fields = ('file', 'owner')

    return ImageSerializer


                        
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