英文:
How can I modify the Serializer filed of django restframework ModelSerializer when use it in view.py?
问题
这是我的DRF序列化器：
class TranMetaSerializer(serializers.ModelSerializer):
class Meta:
model = TranMeta
fields = "__all__"
当我在view.py中使用序列化器时，我想通过request.GET来更改字段：
@api_view(["GET"])
def getTran_all(request, formar=None):
fields = request.GET.get("fields")
if fields:
fields = fields.split(",")
data = TranMeta.objects.order_by("data_id").values(*fields)
else:
fields = "__all__"
data = TranMeta.objects.all()
serializer = TranMetaSerializer(data, many=True)
但上面的代码会引发一个错误，错误信息是"Field.init() got an unexpected keyword argument 'fields'"。那么我该如何实现我的目标呢？
英文:
This is my DRF serializer:
class TranMetaSerializer(serializers.ModelSerializer):
class Meta:
model = TranMeta
fields = "__all__"
And when i use the serializer in view.py, i want to change the filed via request.get filed:
@api_view(["GET"])
def getTran_all(request, formar=None):
fields = request.GET.get("fields")
if fields:
fields = fields.split(",")
data = TranMeta.objects.order_by("data_id").values(*fields)
else:
fields = "__all__"
data = TranMeta.objects.all()
serializer = TranMetaSerializer(data, many=True, fields=fields)
But the code above raise an error which says "Field.init() got an unexpected keyword argument 'fields'"
So what can i do to achieve my goal?
答案1
得分: 2
我建议您使用DRF中提供的动态字段序列化器。
class TranMetaSerializer(serializers.ModelSerializer):
class Meta:
model = TranMeta
fields = "__all__"
def __init__(self, *args, **kwargs):
# 不要将 'fields' 参数传递给超类
fields = kwargs.pop('fields', None)
# 正常实例化超类
super().__init__(*args, **kwargs)
if fields is not None:
# 删除未在 'fields' 参数中指定的任何字段
allowed = set(fields)
existing = set(self.fields)
for field_name in existing - allowed:
self.fields.pop(field_name)
英文:
I recommend you to use a dynamic fields serializer available in DRF
class TranMetaSerializer(serializers.ModelSerializer):
class Meta:
model = TranMeta
fields = "__all__"
def __init__(self, *args, ***kwargs):
# Don't pass the 'fields' arg up to the superclass
fields = kwargs.pop('fields', None)
# Instantiate the superclass normally
super().__init__(*args, **kwargs)
if fields is not None:
# Drop any fields that are not specified in the `fields` argument.
allowed = set(fields)
existing = set(self.fields)
for field_name in existing - allowed:
self.fields.pop(field_name)
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