Django api 后端过滤器 table

Question

目标是获取与列表 ID 关联的照片。我在 django rest framework

中有波纹管结构

Model.py

class Pictures(models.Model):
    index = models.BigIntegerField(blank=True, null=True)
    listing_id = models.ForeignKey(
        Listings, models.DO_NOTHING, blank=True, null=True)
    post_title = models.TextField(blank=True, null=True)
    guid = models.TextField(blank=True, null=True)
    post_mime_type = models.TextField(blank=True, null=True)

    class Meta:
        managed = False
        db_table = 'pictures'

Serializer.py

class PicturesSerializer(serializers.ModelSerializer):
    class Meta:
        model = Pictures
        fields = ('index', 'listing_id', 'guid')

Views.py

class PicturesListViewAlt(generics.ListAPIView):
    serializer_class = PicturesSerializer

    def get_queryset(self):
        if self.request is None:
        return Pictures.objects.none()
    id_of_listing = self.kwargs['listing_id']
    return Pictures.objects.filter(listing_id=id_of_listing)

urls.py

app_name = 'pics'

    urlpatterns = [
    re_path('^pictures/(?P<listing_id>.+)/$',
            views.PicturesListViewAlt.as_view()),
]

我一直收到以下错误。

django.db.utils.ProgrammingError: column pictures.listing_id_id does not exist
LINE 1: ...ELECT COUNT(*) AS "__count" FROM "pictures" WHERE "pictures"...
                                                             ^
HINT:  Perhaps you meant to reference the column "pictures.listing_id".

[03/Feb/2022 11:58:17] "GET /api/pictures/123/ HTTP/1.1" 500 24360

虽然我从来没有发起过专栏listing_id_id

和

    ProgrammingError at /api/pictures/123/
    column pictures.listing_id_id does not exist
    LINE 1: ...ELECT COUNT(*) AS "__count" FROM "pictures" WHERE "pictures"...
                                                                 ^
    HINT:  Perhaps you meant to reference the column "pictures.listing_id".

Which when I change my filter to pictures__listing_id I get 

django.core.exceptions.FieldError: Cannot resolve keyword 'pictures' into field. Choices are: guid, id, index, listing_id, listing_id_id, post_mime_type, post_title
[03/Feb/2022 12:07:46] "GET /api/pictures/123/ HTTP/1.1" 500 22236

抱歉问了这么长的问题，但我已经问了好几个小时了。任何帮助深表感谢。干杯！

Answer 1

来自Database Representation [Django-doc]

Behind the scenes, Django appends "_id" to the field name to create its database column name

这就是为什么它将 _id 附加到您的 listing_id 字段并搜索 listing_id_id 作为列的原因。所以你不必在声明 Model.

时添加 _id

将您的 Picture 模型更改为

class Pictures(models.Model):
    id = models.AutoField(primary_key=True)
    index = models.BigIntegerField(blank=True, null=True)
    listing = models.ForeignKey(Listings, models.DO_NOTHING, blank=True, null=True)
    post_title = models.TextField(blank=True, null=True)
    guid = models.TextField(blank=True, null=True)
    post_mime_type = models.TextField(blank=True, null=True)

    class Meta:
        managed = False
        db_table = 'pictures'

同时将您的 Serializer.py 更改为

class PicturesSerializer(serializers.ModelSerializer):
    class Meta:
        model = Pictures
        fields = ('index', 'listing', 'guid')

Django api 后端过滤器 table

Django api backend filter table

python

django

django-rest-framework