我正在使用Django 1.6(很快升级到1.8),Python 2.7和DRF 3.2.5(很快升级到最新版本) .
我有一套深度嵌套的序列化程序(~10级深度,总共20-30个序列化的模型) . 我正在尝试向上下文添加一个布尔标志,这将确定序列化的输出层次结构是详细的(包括所有模型的字段)还是基本的(仅部分字段) .
我写了以下代码(部分代码段):
from rest_framework import serializers
from app.models import Institute, Department, Member
class MemberSerializer(serializers.ModelSerializer):
def get_fields(self):
fields = super(MemberSerializer, self).get_fields()
if self.context['basic_view']:
for field in ['height', 'weight']:
del fields[field]
return fields
class Meta:
model = Member
fields = ('id', 'birth_date', 'height', 'weight')
class DepartmentSerializer(serializers.ModelSerializer):
members = MemberSerializer(many=True, read_only=True)
def get_fields(self):
fields = super(DepartmentSerializer, self).get_fields()
if self.context['basic_view']:
for field in ['type', 'manager']:
del fields[field]
return fields
class Meta:
model = Department
fields = ('id', 'name', 'type', 'manager', 'members')
class InstituteSerializer(serializers.ModelSerializer):
departments = DepartmentSerializer(many=True, read_only=True)
def get_fields(self):
fields = super(InstituteSerializer, self).get_fields()
if self.context['basic_view']:
for field in ['name', 'type']:
del fields[field]
return fields
class Meta:
model = Institute
fields = ('id', 'name', 'type', 'departments')
def get_entities(is_basic_view):
institutes_list = Institute.objects.all()
serializer = InstituteSerializer(institutes_list, many=True, read_only=True, context={'basic_view': is_basic_view})
return serializer.data
但随后发现从'get_entities'传递给'InstituteSerializer'的'context'不会传递给嵌套的序列化器 . 这意味着在上面的例子中 - InstituteSerializer在'context'中有'basic_view',但是MemberSerializer和DepartmentSerializer没有 .
我在context in nested serializers django rest framework中找到了一个有效的解决方案:每个嵌套字段使用SerializerMethodField(例如'departments'),并在'get_'方法中手动传递上下文 . 我的解决方案的问题是它需要在我的代码中嵌入此代码20-30次,最终使源代码行数量增加一倍 .
我的请求 - 如果有人(或可以帮助实现)serializers.ModelSerializer的扩展,它将在构造时获得一个额外的参数,例如'inherit_context' . 然后,我需要在我的类中更改的唯一内容,例如在'InstituteSerializer'中,是添加该参数:
class InstituteSerializer(serializers.ModelSerializer):
departments = DepartmentSerializer(many=True, read_only=True, inherit_context=True)
def get_fields(self):
fields = super(InstituteSerializer, self).get_fields()
if self.context['basic_view']:
for field in ['name', 'type']:
del fields[field]
return fields
class Meta:
model = Institute
fields = ('id', 'name', 'type', 'departments')
1 回答
显然我错过了一些东西...... 'context' is already inherited 下到嵌套的序列化器......
However, 它对我不起作用的原因是因为作为我的嵌套的一部分,一些子序列化器是通过serializers.SerializerMethodField()定义的 . 在例如 (only!) 的情况下,上下文自动继承 not .
解决方案是在与每个SerializerMethodField相关的'get _...'方法中简单地传递'context':
P.S - 与我的类似的DRF github问题刚刚创建:https://github.com/tomchristie/django-rest-framework/issues/2555