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创建自定义筛选器

django-filter django-rest-framework django

2

blueFast · 技术社区 · 7 年前

目前我的看法如下:

from rest_framework.permissions import AllowAny
from dynamic_rest.viewsets import DynamicModelViewSet
from django_filters.rest_framework import DjangoFilterBackend

from .models import Purchase
from .serializers import PurchaseSerializer


class PurchasesViewSet(DynamicModelViewSet):
    queryset = Purchase.objects.all()
    serializer_class = PurchaseSerializer
    permission_classes = (AllowAny,)
    filter_backends = (DjangoFilterBackend,)
    filter_fields = ('name', 'color')

这样我就可以通过精确的 name 和 color .

date DateField 类型)。我想按“季度”创建一个自定义筛选器,以便此类请求:

/purchases/?quarter=2018Q1

提供具有指定季度的字段。请注意 quarter 不是模型字段。

创建这样一个自定义过滤器的方法是什么?

2 回复 | 直到 7 年前

1

2

JPG 7 年前

首先,你必须创造 自定义筛选器 随着 筛选器类

import django_filters
from rest_framework.exceptions import ValidationError


class QuarterFilter(django_filters.Filter): # Custom Filter
    def get_quarter_range(self, quarter):
        if quarter == 1:
            return [1, 3]
        elif quarter == 2:
            return [4, 6]
        elif quarter == 3:
            return [7, 9]
        elif quarter == 4:
            return [10, 12]
        else:
            raise ValidationError("quarter value must be range from 1-4")

    def filter(self, qs, value):
        """
        create your custom filtering logi here
        """
        # here the "value" will be the value parsed from URL params, ie "2018Q1"
        try:
            year, quarter = value.split("Q") # spliting the input to get year and quarter value
            qs = qs.filter(date__year=year)

            qs = qs.filter(date__month__range=self.get_quarter_range(quarter))
            return qs
        except:
            return qs


class PurchaseFilter(django_filters.FilterSet): # Custom Filter Class
    quarter = QuarterFilter()

    class Meta:
        model = Purchase
        fields = ['name', 'color', 'quarter']

然后,在你的课堂上提到它 filterset_class 属性。那么你的观点是,

class PurchasesViewSet(DynamicModelViewSet):
    queryset = Purchase.objects.all()
    serializer_class = PurchaseSerializer
    permission_classes = (AllowAny,)
    filter_backends = (DjangoFilterBackend,)
    # filter_fields = ('name', 'color') ---- Remove this line of code
    filterset_class = PurchaseFilter

注意
我不确定这条线,

qs = qs.filter(date__month__range=self.get_quarter_range(quarter))

但是,在这种特殊情况下,您需要这样做过滤。

希望这有帮助!!

2

Ngoc Pham 7 年前

您可以在filter\u类中创建自定义筛选器

from rest_framework import filters

class CustomFilter(django_filters.rest_framework.FilterSet):
    class Meta:
        model = Purchase
        fields = ['name', 'color', 'quarter']
    quarter = QuarterFilter(name="quarter")

class QuarterFilter(django_filters.Filter):
    def filter(self, qs, value):
        # create custom in this with value
        return qs.filter(name=value)

class PurchasesViewSet(DynamicModelViewSet):
    queryset = Purchase.objects.all()
    serializer_class = PurchaseSerializer
    permission_classes = (AllowAny,)
    filter_backends = (DjangoFilterBackend,)
    filter_class = CustomFilter