我正在使用带有https://github.com/alex/django-filter/的django-rest-framework,但问题主要是关于django-filter。我无法理解如何使用“__in”查找过滤器。
例如我有模特:
class Book(models.Model):
name = models.CharField(max_length=100)
class BookView(viewsets.ReadOnlyModelViewSet):
serializer_class = BookSerializer()
model = Book
filter_fields = ('id', 'name')
我不能像这样使用网址
/ V1 /书籍/?id__in = 1,2,3
查找ID为1,2或3的图书
答案 0 :(得分:6)
本期讨论的问题是:https://github.com/alex/django-filter/issues/137#issuecomment-77697870
建议的解决方案是创建自定义过滤器,如下所示:
from django_filters import Filter
from django_filters.fields import Lookup
from .models import Product
class ListFilter(Filter):
def filter(self, qs, value):
value_list = value.split(u',')
return super(ListFilter, self).filter(qs, Lookup(value_list, 'in'))
class ProductFilterSet(django_filters.FilterSet):
id = ListFilter(name='id')
class Meta:
model = Product
fields = ['id']
您可以写下以下内容:
产品/?ID = 7,8,9
答案 1 :(得分:3)
django-filter的文档很稀疏。您可以尝试创建自定义过滤器并指定查找类型。它相当令人费解:
class BookFilter(django_filters.FilterSet):
id = django_filters.NumberFilter(name="id", lookup_type="in")
class Meta:
model = Book
fields = ['id']
然后修改视图以使用过滤器类:
class BookView(viewsets.ReadOnlyModelViewSet):
serializer_class = BookSerializer()
model = Book
filter_fields = ('id', 'name')
filter_class = BookFilter
然后您可以通过他们的ID查找书籍(注意" __ in"未使用):
/v1/books/?id=1,2,3
/v1/books/?id=1
答案 2 :(得分:3)
django过滤器提供BaseInFilter
以便与其他过滤器类(例如NumberFilter
,CharFilter
)结合使用。此类仅验证传入请求为comma-separated
。因此,如果您使用的是Web Browsable API,则可以/ book /?id__in = 1 %2C
3的形式发送请求,其中%2C
是逗号。
filters.py
import django_filters
class NumberInFilter(django_filters.BaseInFilter, django_filters.NumberFilter):
pass
class BookFilter(django_filters.FilterSet):
id__in = NumberInFilter(field_name="id", lookup_expr="in")
views.py
from rest_framework import viewsets
from django_filters import rest_framework as filters
from book.filters import BookFilter
from book.models import Book
from book.serializers import BookSerializer
class BookViewSet(viewsets.ReadOnlyModelViewSet):
queryset = Book.objects.all()
filter_backends = (filters.DjangoFilterBackend, )
filterset_class = BookFilter
serializer_class = BookSerializer
答案 3 :(得分:1)
为您的id字段(AutoField)自定义PKsField和PKsFilter,然后查询参数将起作用:'/ v1 / books /?id__in = 1,2,3'
from django.forms import Field
from django_filters.filters import Filter
from django.db.models import AutoField
class PKsField(Field):
def clean(self, value): # convert '1,2,3' to {1, 2, 3}
return set(int(v) for v in value.split(',') if v.isnumeric()) if value else ()
class PKsFilter(Filter):
field_class = PKsField
class BookFilter(FilterSet):
# ids = PKsFilter(name='id', lookup_type="in") # another way, query string: ?ids=1,2,3
filter_overrides = {
AutoField: {
'filter_class': PKsFilter, # override default NumberFilter by the PKsFilter
'extra': lambda f: {
'lookup_type': 'in',
}
}
}
class Meta:
model = Book
fields = {
'id': ('in',),
}
from rest_framework import viewsets
class BookView(viewsets.ModelViewSet):
queryset = ...
serializer_class = ...
filter_class = BookFilter
希望能有所帮助。 THX。
答案 4 :(得分:1)
现在有一个django_filter
的简单解决方案:
class BookView(viewsets.ReadOnlyModelViewSet):
serializer_class = BookSerializer()
model = Book
filter_fields = {
'id': ['exact', 'in'],
'name': ['exact']
}
然后,您可以根据需要在查询字符串中完全使用它:?id__in=1,2,3
。
答案 5 :(得分:0)
而是/v1/books/?id__in=1,2,3
您可以使用/v1/books/?id=1&id=2&id=3
答案 6 :(得分:0)
不确定是否曾经回答过: 尝试: id = [1、2、3]用于数字 name = [“ name1”,“ name2”]用于字符串
答案 7 :(得分:0)
我刚刚在DjangoFilterBackend with multiple ids中回答了相同的问题
对于您的情况,这无需编写任何逻辑即可工作。
from django_filters import rest_framework as filters
class NumberInFilter(filters.BaseInFilter, filters.NumberFilter):
pass
class BookFilter(filters.FilterSet):
id_in = NumberInFilter(field_name='id', lookup_expr='in')
class Meta:
model = Book
fields = ['id_in', 'name']
class BookView(viewsets.ReadOnlyModelViewSet):
serializer_class = BookSerializer()
model = Book
filter_class = BookFilter
现在,您应该可以按get参数中的ID列表进行过滤,例如/v1/books/?id__in=1,2,3
答案 8 :(得分:-1)
django管理站点仅在模板app_name / model_name / primary_key下创建URL以编辑模型的实例。它不通过URLS提供__in
过滤。
您必须创建自定义视图:
def myview(request):
# you can get parameters from request.GET or request.POST
selected_books = None
if request.method = "POST":
ids = request.POST["ids"].split("_")
selected_books = Book.objects.filter(id__in=ids)
return render_to_response('mytemplate.html', { 'selected_books': selected_books }, context_instance = RequestContext(request) )
在mytemplate.html中:
{% for entry in selected_books %}
... {{ entry }} ...
{% endfor %}
在urls.py中为此视图添加一个条目。
然后尝试使用参数?ids=1_2_3