[英]Serialize model fields related through another model
I have four models linked like so: 我有四个这样链接的模型:
class A:
some fields
class B:
ForeignKey('A')
class C:
ForeignKey('B')
class D:
ForeignKey('C')
Now, when I serialize D, I want to also serialize related model fields from A. Of course, this can be done using nested serializers like so: 现在,当我序列化D时,我也想序列化A的相关模型字段。当然,可以使用嵌套的序列化程序来完成,如下所示:
class ASerializer:
class Meta:
model = A
fields = ('id', some fields)
class BSerializer:
a_s = ASerializer(read_only=True)
class Meta:
model = B
fields('id', 'a_s')
class CSerializer:
b_s = BSerializer(read_only=True)
class Meta:
model = C
fields('id', 'b_s')
class DSerializer:
c_s = CSerializer(read_only=True)
class Meta:
model = D
fields('id', 'c_s')
However, I want to only display the fields of related A objects when serializing D and not include C or B objects. 但是,我只想在序列化D时只显示相关A对象的字段,而不要包括C或B对象。 How do I do this?
我该怎么做呢?
you can define serializers.SerializerMethodField()
in class CSerializer
: 您可以在
class CSerializer
定义serializers.SerializerMethodField()
:
class DSerializer:
c_s = serializers.SerializerMethodField()
@staticmethod
def get_c_s(item):
return item.c.b.a
class Meta:
model = D
fields('id', 'c_s')
Document: https://www.django-rest-framework.org/api-guide/fields/ 文件: https : //www.django-rest-framework.org/api-guide/fields/
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