如何重新排序Django Graphene子查询?
我正在尝试根据ProductLandingpageImage模型上的“订单”字段对ProductLandingPageImageNode重新排序 如果这是一个直接查询,我可以编写一个resolve方法,但我无法找出如何在子查询上实现这一点 主要查询:如何重新排序Django Graphene子查询?,django,graphql,django-oscar,graphene-python,Django,Graphql,Django Oscar,Graphene Python,我正在尝试根据ProductLandingpageImage模型上的“订单”字段对ProductLandingPageImageNode重新排序 如果这是一个直接查询,我可以编写一个resolve方法,但我无法找出如何在子查询上实现这一点 主要查询: class Query(graphene.ObjectType): class Meta: interfaces = [relay.Node, ] product_oscar = graphene.List(ProductNode
class Query(graphene.ObjectType):
class Meta:
interfaces = [relay.Node, ]
product_oscar = graphene.List(ProductNode)
productByID = DjangoFilterConnectionField(ProductNode)
def resolve_product_oscar(self, info, **kwargs):
return Product.objects.all()
PRODUCTNODE:
class ProductNode(DjangoObjectType):
class Meta:
model = Product
interfaces = (relay.Node, )
filter_fields = {
"slug" : ['iexact']
}
PRODUCTLANDINGPAGEIMAGENODE:
class ProductLandingpageImageNode(DjangoObjectType):
class Meta:
model = ProductLandingpageImage
interfaces = (relay.Node, )
如何解决这个问题
LANDINGPAGEIMAGE型号按要求提供:
class AbstractProductLandingpageImage(models.Model):
"""
A landingpageimage of a product
"""
product = models.ForeignKey(
'catalogue.Product',
on_delete=models.CASCADE,
related_name='landingpage_image',
verbose_name=_("Product landingpage"))
date_created = models.DateTimeField(_("Date created"), auto_now_add=True)
original = models.ImageField(
_("Landingpage original"), upload_to=settings.OSCAR_IMAGE_FOLDER, max_length=255, blank=True)
ORDER_CHOICES = (
(1, 1),
(2, 2),
(3, 3),
(4, 4),
(5, 5),
(6, 6),
)
order = models.PositiveIntegerField(default=1, choices=ORDER_CHOICES, blank=True)
class Meta:
abstract = True
app_label = 'catalogue'
# Any custom models should ensure that this ordering is unchanged, or
# your query count will explode. See AbstractProduct.primary_image.
ordering = ["order"]
verbose_name = _('Product landingpage image')
verbose_name_plural = _('Product landingpage images')
元中的默认顺序不知何故不起作用。同样奇怪的是,当我用Graphql查询订单值时,返回的不是“1,2,3…”,而是“A_1,A_2…”可能是这样的。由于您没有列出您的产品型号,我只是在产品上创建了引用图像的字段的名称,所以您应该重命名它。如果产品和图像之间存在多对一关系,则可能需要不同的字段名
import graphene
from graphene.django.types import DjangoObjectType
class ProductNode(DjangoObjectType):
name_of_your_image_field = graphene.Field(ProductLandingpageImageNode)
class Meta:
model = Product
... other Meta data
def resolve_name_of_your_image_field(self, info): # rename to match field
# Put the code that returns a single ProductLandingpageImage instance here
# graphene-django will convert your ProductLandingPageImage instance into a ProductLandingpageImageNode
这用于返回单个ProductLandingPageIMage
。如果要返回多个实例,请将字段定义更改为列表
name_of_your_image_field = graphene.List(ProductLandingpageImageNode)
然后在您的解析程序中返回多个ProductLandingPageImage实例--例如,一个按您希望的方式排序的查询集。您没有显示模型,但我猜您希望在ProductNode中为ProductLandingPageImage模型创建一个显式解析程序,该解析程序具有您想要的顺序,而不是使用DjangObjectType创建的默认解析方法。谢谢您的回答。这正是我需要的。@MarkChackerian你能告诉我如何编写显式解析器吗?