CODEWITHSUNDEEP
pythondjangodjango-rest-frameworkdjango-filter
Ali Tavallaie
Ali Tavallaie

Reputation: 123

Django Rest Framework django_filters return empty list

I'm trying to filter my queryset on Datefield based on year and month. After searching a lot I found this answer and tried to use it. but when I use filter I got and empty list.

model.py:

class Sample(models.Model):
    name = models.CharField(max_length=50)
    date = models.DateField(auto_now=False, auto_now_add=False)

serializer.py:

class SampleSerializer(serializers.ModelSerializer):
    class Meta:
        model = Sample
        fields = '__all__'

filter.py:

import django_filters # only for showing I use django_fliter not drf defult filter
from .models import Sample

class SampleDateFilter(django_filters.FilterSet):
    month = django_filters.NumberFilter("date", lookup_expr='month')
    year = django_filters.NumberFilter('date',lookup_expr='year')
    class Meta:
        model=Sample
        fields = ['month','year']

views.py:

class SampleListview(generics.ListAPIView):
    serializer_class = SampleSerializer
    queryset = Sample.objects.all()
    filter_backends = (DjangoFilterBackend,)
    filterset_class = SampleFilter

I have an object in my database with this config:

{
        "id": 1,
        "name": "test",
        "date": "2020-05-03", #date format %YYYY-%MM-%DD
    }

without filter I got my list but I got nothing when I use queryparam:

http://127.0.0.1:8000/sample/?year=2020
http://127.0.0.1:8000/sample/?month=05

or any combination of both filters. I'm using:

django-filter==2.4.0
djangorestframework==3.12.4
Django==3.0.8

How can I fix this? Thanks

Upvotes: 0

Views: 295

Answers (1)

user12065892
user12065892

Reputation:

Your filter set is wrong.

Try this:

import django_filters
from .models import Sample

class SampleDateFilter(django_filters.FilterSet):
    month = django_filters.NumberFilter(field_name='date__month', lookup_expr='exact')
    year = django_filters.NumberFilter(field_name='date__year', lookup_expr='exact')
    class Meta:
        models=Sample
        fields = ['month','year']

Also you can use gte lte etc as expression

Upvotes: 2

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