序列化DRF中的foreingkey和多个字段

Question

我有这样的模型：

class Category(models.Model):
    name = models.CharField(max_length=255)
    slug = models.SlugField(unique=True, max_length=255, blank=True,default=None)
    desc = models.TextField(blank=True, null=True )

    ...

class Post(models.Model):
   title = models.CharField(max_length=255)
   pub_date = models.DateTimeField(editable=False,blank=True)
   author = models.ForeignKey(User, null=True, blank=True)
   categories = models.ManyToManyField(Category, blank=True, through='CatToPost')

   ...


class CatToPost(models.Model):
    post = models.ForeignKey(Post)
    category = models.ForeignKey(Category)

    ...

这是序列化器：

 class CategorySerializer(serializers.ModelSerializer):
   class Meta:
        model = Category
        fields = ('name','slug')

class PostSerializer(serializers.ModelSerializer):
    categories = CategorySerializer(many=True, required=True)


    class Meta:
        model = Post
        .......

views.py

class SingleListing(generics.RetrieveUpdateDestroyAPIView):
    queryset = Post.objects.all()
    serializer_class =Post

串行

但是这不会在Web浏览视图中显示类别字段。我只看到类别标签，但此字段的输入字段不存在。问题是什么？

Answer 1

DRF不支持many=True并且Lists are not currently supported in HTML input. Category上升class PostSerializer(serializers.ModelSerializer): categories = CategorySerializer(required=True) class Meta: model = Post fields = ('id', 'title', 'pub_date', 'author', 'categories') 不是一个模型的字段。它将显示所有与模型相关的字段。

试试这个：

serializers.py

class SingleViewSet(viewsets.ModelViewSet):
    queryset = Post.objects.all()
    serializer_class = PostSerializer

views.py

private static double LatitudeDiffToMeters(double latitudeDiff)
    {
        return (R*latitudeDiff*Math.PI)/180;
    }

    private static double LongitudeDiffToMeters(double longitudeDiff, double latitude)
    {
        return (longitudeDiff*Math.PI* R * Math.Cos (Math.PI * latitude / 180))/180;
    }


    private static double CalculateLatitude(double latitude, double offset)
    {
        return latitude + ((offset/R) * (180/Math.PI));
    }

    private static double CalculateLongitude(double longitude, double latitude, double offset)
    {
        return longitude + offset / (R * Math.Cos (Math.PI * latitude / 180)) * (180 / Math.PI);
    }

在web-browserview中显示字段

Answer 2

好吧，你应该像这样编写序列化器：

class CategorySerializer(serializers.ModelSerializer):
      class Meta:
            model = Category
            fields = ('name','slug')

class PostSerializer(serializers.ModelSerializer):

      class Meta:
            model = Post  
            fields = ('id','{anything you want}','categories')
            depth = 2