[英]Django Rest Framework serializers as forms and nested relationships
[英]django rest framework serializers and django forms
問題 :如何在表單和序列化器中編寫用於字段驗證的DRY代碼?
示例 :我有簡單的django應用程序和模型表單,它驗證Order
passengers
字段:
def clean_passengers(self):
passengers = self.cleaned_data['passengers']
if passengers > self.flight.available_seats:
raise forms.ValidationError(
_(u'''Passengers count can`t be greater then seats count'''))
return passengers
和Order
serializer中的驗證代碼相同:
def validate_passengers(self, attrs, source):
passengers = attrs[source]
if passengers > self.flight.available_seats:
raise serializers.ValidationError(
_(u'''Passengers count can`t be greater then seats count'''))
return attrs
這不是干的,我寫了兩次相同的邏輯。 我怎么能避免這個? 也許我可以從表單或類似的東西繼承序列化程序。
您可以使用序列化程序反序列化並驗證表單的is_valid
方法中的數據。
class MyModelForm(ModelForm):
def is_valid(self):
# Call super's is_valid to populate cleaned_data and do basic field validation
valid = super(MyModelForm, self).is_valid()
if not valid:
return False
serializer = MyModelSerializer(data=self.cleaned_data)
return serializer.is_valid()
這里我為模型表單實現了可重用的驗證類。 除了重寫的get_serializer
方法之外,所有原生的Django都在這里。 使用Django 1.8.13驗證工作狀態。
class RestFrameworkValidationModelForm(forms.ModelForm):
serializer_class = None
def get_serializer(self, *args, **kwargs):
"""
Return the serializer instance that should be used for validating and
deserializing input, and for serializing output.
"""
assert self.serializer_class is not None, (
"'%s' should either include a `serializer_class` attribute, "
"or override the `get_serializer()` method."
% self.__class__.__name__
)
return self.serializer_class(*args, **kwargs)
def is_valid(self):
if super(RestFrameworkValidationModelForm, self).is_valid():
serializer = self.get_serializer(data=self.cleaned_data)
valid = serializer.is_valid()
self.add_error(None, serializer.errors)
return valid
return False
以下是用法示例:
class ExperimentForm(RestFrameworkValidationModelForm):
serializer_class = ExperimentSerializer
class Meta:
model = Experiment
exclude = []
我建議將所有驗證(如果可能)放入模型(驗證器或clean
)。
然后ModelForm
和ModelSerializer
使用模式驗證。
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