Question

我有两个桌子。

class Writer(models.Model)
    name = model.CharField()
    ...

class Article(models.Model)
    name = model.CharField()
    writer = model.ForeignKey('Writer', related_name="relationship") 
    ...

我想构建一些API端点来获取作者列表，但这应该可以按文章ID进行过滤。我正在使用django-filter。所以：

class WriterViewSet(viewsets.ReadOnlyModelViewSet):
   filter_backend = [filters.djangoFilterBackend],
   filter_class = WriterFilter


class WriteFilter(django_filters.rest_framework.FilterSet):
....

所以我关心的是，如何定义WriteFilter来按文章过滤Writer？

Answer 1

您可以尝试这样。我的班级用新的参数定制了过滤器。您的api必须具有额外的参数。在这种情况下是？article_name ='example'

class WriteFilter(django_filters.rest_framework.FilterSet):
    class Meta:
        model = WriterFilter
        fields = ['article_name']
    article_name = ArticleFilter(name="article_name")

class ArticleFilter(django_filters.Filter):
    def filter(self, qs, value):
        return qs.article_set.filter(name=value)

如果运行queryset，它将获得所有文章名称为“ example”的Writer。

获取帮助

Answer 2

class WriteFilter(django_filters.rest_framework.FilterSet):
    article = django_filters.CharFilter(name='relationship__name', lookup_expr='contains')

    class Meta:
        model = WriterFilter
        fields = ['article']

您的网址就是这样，
/api/wtiter/list/?article=somearticlename

UPDATE-1

由于 django-filter 2.0 ， name 参数更改为 field_name 。

因此，过滤器类将是

class WriteFilter(django_filters.rest_framework.FilterSet):
    article = django_filters.CharFilter(field_name='relationship__name', lookup_expr='contains')

    class Meta:
        model = WriterFilter
        fields = ['article']

Answer 3

JPG的答案是正确的，但是如果您有很多领域和关系，那将是一件繁琐的工作。但是您实际上可以在field元中声明关系：

class ArticleFilter(django_filters.rest_framework.FilterSet):
    class Meta:
        model = Article
        fields = ['article', 'writer__name']

或带有查找表达式：

class ArticleFilter(django_filters.rest_framework.FilterSet):
    class Meta:
        model = Article
        fields = {
            'article': ('exact', ),
            'relationship__name': ('exact', 'contains')
            }

还有更多优化：

def prefix_dict_keys(prefix: str, d: dict):
    return {prefix + k: v for k, v in d.items()}

class ArticleFilter(django_filters.rest_framework.FilterSet):
    class Meta:
        model = Article
        fields = {
            'article': ('exact', ),
            ...
            **prefix_dict_keys('writer__'
                {
                   'name': ('exact', 'contains')),
                   ...
                }),
            ...
            }

Django过滤器按相关字段过滤

3 个答案:

UPDATE-1