Django Rest Framework：如何在JSON中显示外键的内容 [英] Django Rest Framework: how do I Display content of Foreign keys in JSON

问题描述

我已经将一个模型序列化为具有外键的JSON。 API将显示外键的标题，但不会嵌套属于该外键的数据。我该怎么做。

I have serialised a model into JSON that has foreign keys. The API will show the title of the foreign key but will not nest the data that belongs to that foreign key. How do I do this.

serializers.py

serializers.py

class ReportFieldSerializers(serializers.ModelSerializer):
    form = serializers.RelatedField()
    class Meta:
        model = ReportField
        fields = (
            'id',
            'title',
            'form'
        )

api.py

class ReportFieldList(APIView):
    def get(self, request, format=None):
        report_field = ReportField.objects.all()
        serialized_report_field = ReportFieldSerializers(report_field, many=True)
        return Response(serialized_report_field.data)

class ReportFieldDetail(APIView):
    def get_object(self, pk):
        try:
            return ReportField.objects.get(pk=pk)
        except ReportField.DoesNotExist:
            raise Http404

    def get(self, request, pk, format=None):
        report_field = self.get_object(pk)
        serialized_report_field = ReportFieldSerializers(report_field)
        return Response(serialized_report_field.data)

models.py

models.py

class Report(models.Model):
    title = models.CharField()
    form = models.ForeignKey()

class Form(models.Model):
    # Form details

推荐答案

有一个选项 depth 可以使用在序列化器的Meta类中。例如：

There is an option depth, that can be used in the Meta class of the serializer. For example:

class ReportFieldSerializers(serializers.ModelSerializer):

    class Meta:
        model = ReportField
        fields = (
            'id',
            'title',
            'form'
        )
        depth = 1

这将在相关模型中往下移一步。如您所见，您不需要 RelatedField 。假设有第三个模型类，例如：

This will go one step down in the related models. As you see you don't need the RelatedField. If, let's say, there would be a third model class, for example:

class Form(models.Model):
    example = ForeignKey('AnotherModel')

class AnotherModel(models.Model):
    # model fields

您还可以在 ReportFieldSerializer 中使用 depth = 2 该模型的信息。

you could also use depth=2 in your ReportFieldSerializer to display the information for this model.

我假设在您的模型报告中，字段 显示为表格： models.ForeignKey（Form）。

I assume that in your model Report the field form shows to Form: models.ForeignKey(Form).

我已经在这里回答了类似的问题：
具有内部关系的Django rest_framework序列化程序

I answered already a similar question here: Django rest_framework serializer with inner relationship

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