DRF 将数据从 API 反序列化到 django model

Question

I'm using serializers of django-rest-framework (DRK)

I'm fetch data from an external API, and I want to convert this datas into an internal model (here Period)

The thing is that the field's format of the external api are like this:

{"DateFrom": "2020-02-10T00:00:00"}

I want to rename into " date_from " field.

Here what I tried:

Serializer:

class PeriodSerializer(serializers.ModelSerializer):
    date_from = serializers.DateTimeField(write_only=True, source='DateFrom')

    class Meta:
        model = Period
        fields = ('date_from',)

Notice that I tried with " write_only=True, source='DateFrom' "

And then in my code:

json = {"DateFrom": "2020-02-10T00:00:00"}

serializer = PeriodSerializer(data=json)
serializer.is_valid() # This is returning False

print(serializer.errors)  

And then the output is:

{'date_from': [ErrorDetail(string='This field is required.', code='required')]}

How handle that? (in the best way (good practice))

Answer 1

I think you have something backwards here. Given your model and what you expose in your API, you would want to do:

class PeriodSerializer(serializers.ModelSerializer):
    DateFrom = serializers.DateTimeField(write_only=True, source='date_from')

source specifies the data source on the model, while the name of the serializer field is what the field will be named when serialized.