使用带有连接表的 Django-Rest-Framework 创建 API

Question

我有以下 MySQL 表：
-制作
-型号
-风格

models.py（自动生成）

class Makes(models.Model):
  id = models.IntegerField(primary_key=True)
  name = models.CharField(max_length=13)
  nicename = models.CharField(db_column='niceName', max_length=13)
  class Meta:
      managed = False
      db_table = 'Makes'


class Models(models.Model):
    id = models.CharField(primary_key=True, max_length=36)
    name = models.CharField(max_length=23)
    nicename = models.CharField(db_column='niceName', max_length=23)
    make =  models.ForeignKey(Makes, models.DO_NOTHING)
    class Meta:
      managed = False
      db_table = 'Models'

序列化器.py

class MakeSerializer(serializers.ModelSerializer):


  class Meta:
    model = Makes
    fields = ('name',)


class ModelSerializer(serializers.ModelSerializer):


make = MakeSerializer(many=True, read_only=True)

class Meta:
    model = Models
    fields = ('make','id', 'name', 'nicename')

views.py

class MakesList(generics.ListCreateAPIView):
     queryset = Makes.objects.all()
     serializer_class = MakeSerializer

class MakesDetail(generics.RetrieveUpdateDestroyAPIView):
     queryset = Makes.objects.all()
     serializer_class = MakeSerializer

换句话说，Styles 是父表，其中包含用于连接两者的 Make 和 Model 的 ID。

我如何与 DRF 建立关系以获得预期的输出：

    "makes": [{
    "id": 1,
    "name": "Acura",
    "models": [{
        "id": "Acura_ILX",
        "name": "ILX",
        "styles": [{
                  "id": "1"
                  "name": "Sport"
                  }]
    }, {
        "id": "Acura_ILX_Hybrid",
        "name": "ILX Hybrid",
        "styles": [{
                  "id": "1"
                  "name": "Sport"
                  }]
    }, {
        "id": "Acura_MDX",
        "name": "MDX",
        "styles": [{
                  "id": "1"
                  "name": "Sport"
                  }]
        }]

Answer 1

所以基本上你要做的就是创建一堆序列化器。

class MakeSerializer(serializers.ModelSerializer):
    class Meta:
        model = Make
        fields = ('your', 'fields', 'here')

class ModelSerializer(serializers.ModelSerializer):
    make = MakeSerializer(many=True, read_only=True)

    class Meta:
        model = Model
        fields = ('name', 'just_fields_here')

class StyleSerializer(serializers.ModelSerializer):
    model = ModelSerializer(many=True, read_only=True)

    class Meta:
        model = Style
        fields = ('your_fields_here_again', )

这就是您的序列化程序最简单的样子。

你可以这样使用它：

>>> make = Make.objects.create(name="Audi")
>>> model1 = Model.objects.create(make=make, name='R8')
>>> model2 = Model.objects.create(make=make, name='Q7')
>>> Style.objects.create(model=model1, name='Sport')
>>> Style.objects.create(model=model2, name='SUV')

>>> serializer = MakeSerializer(instance=make)

并通过使用

>>> serializer.data

你的输出应该是这样的：

{
    'name': 'Audi',
    'model': [{
        'name': 'R8',
        'style': {
            'name': 'Sport'
        }
    },{
        'name': 'Q7',
        'style': {
            'name': 'SUV'
        }
    }]
}