Question

我正在使用django rest框架，我想用自定义方法订购。

所以，当我打电话给这个网址时，例如：http://127.0.0.1:8000/api/sets/?ordering=partMissing

可以调用自定义方法，因为我希望通过代码片段丢失部分的数量。我计算了多对多领域中部分数量的总和。

提前感谢您的回答。

Answer 1

我有非常简单的POC，应该允许你实现更复杂的解决方案。

views.py

from rest_framework import viewsets

from ordering_test.models import Test
from ordering_test.ordering import MyCustomOrdering
from ordering_test.serializers import TestSerializer


class TestViewSet(viewsets.ModelViewSet):
    queryset = Test.objects.all()
    serializer_class = TestSerializer
    filter_backends = (MyCustomOrdering,)

ordering.py

from rest_framework.filters import OrderingFilter


class MyCustomOrdering(OrderingFilter):

    allowed_custom_filters = ['testMethod']

    def get_ordering(self, request, queryset, view):
        """
        Ordering is set by a comma delimited ?ordering=... query parameter.

        The `ordering` query parameter can be overridden by setting
        the `ordering_param` value on the OrderingFilter or by
        specifying an `ORDERING_PARAM` value in the API settings.
        """
        params = request.query_params.get(self.ordering_param)

        if params:
            fields = [param.strip() for param in params.split(',')]
            # care with that - this will alow only custom ordering!
            ordering = [f for f in fields if f in self.allowed_custom_filters]
            if ordering:
                return ordering

        # No ordering was included, or all the ordering fields were invalid
        return self.get_default_ordering(view)

    def filter_queryset(self, request, queryset, view):

        ordering = self.get_ordering(request, queryset, view)
        if ordering:
            # implement a custom ordering here
            ordering = ['-id']

        if ordering:
            return queryset.order_by(*ordering)

        return queryset

models.py 和 serializers.py 很简单，但会把它放在这里：

models.py

来自django.db导入模型

class Test(models.Model):
    test = models.CharField(max_length=120)
    test1 = models.CharField(max_length=120)

serializers.py

from rest_framework import serializers

from ordering_test.models import Test


class TestSerializer(serializers.ModelSerializer):

    class Meta:
        model = Test
        fields = ('test', 'test1')

快乐的编码！

Answer 2

我认为opalczynski解决方案更简单的方法是为自定义订购引入一个新领域：

6
-80 800 -8000 -800 80 8000

然后，您可以轻松地按自己想要的任何字段进行排序，例如：max is 4253776 min is 4253776。

在我的示例中，我使用了固定的模型字段，但是您可以在from django import forms import django_filters from rest_framework import serializers from .models import MyModel class MyModelSerializer(serializers.ModelSerializer): class Meta: model = MyModel fields = ('field1',) class CustomOrderingFilter(django_filters.FilterSet): order_by = django_filters.BooleanFilter( widget=forms.HiddenInput(), method='filter_order_by', ) class Meta: model = MyModel fields = [ 'order_by' ] def filter_order_by(self, queryset, name, value): if value: return self.Meta.model.objects.filter( id__in=queryset.values_list('id', flat=True) ).order_by(value) return queryset class TestViewSet(viewsets.ModelViewSet): queryset = MyModel.objects.all() serializer_class = MyModelSerializer filter_class = CustomOrderingFilter上的example.com/api/mymodel/?order_by=partMissing方法中更改订购方式。只需将其更改为所需的逻辑即可，但是请确保使用filter_order_by以确保正在使用设置的其他过滤器。

Django Rest订购自定义

2 个答案: