Django:为单个ManyToManyField过滤具有多个参数的模型 [英] Django: Filter a model with multiple parameters for a single ManyToManyField

问题描述

我有以下型号.

class Contents (models.Model):
  ...
  tags = models.ManyToManyField('Tag')

class Tag (models.Model):
  ...
  name = models.CharField(max_length=20)

请考虑一下，我正在尝试获取同时被两个tag1 and tag2标记的内容.

Just to consider, I am trying to get contents which are tagged with both tag1 and tag2.

Django中是否有一种方法可以执行Contents.objects.filter(tags__name = ['tag1','tag2'])

Is there a way in Django to do something like Contents.objects.filter(tags__name = ['tag1','tag2'])

此处tag1,tag2,...是动态生成的.

更新:

我一直在使用for loop.我正在寻找有效的解决方案.

I have been using for loop. I am looking for an efficient solution.

推荐答案

如果要查找列表，则应该可以使用查找__in:

If you're looking for a list, then you should be able to use the look up __in:

Contents.objects.filter(tags__name__in = ['tag1','tag2'])

请参见文档.

对于同时具有两个标签和仅具有两个标签的查询集，您可能需要链接过滤器调用:

For a queryset with both and only both tags, you may need to chain your filter calls:

tags = ['tag1','tag2']
contents = Contents.objects.all()
for tag in tags:
  contents = contents.filter(tags__name = tag)

这应该过滤查询集，以便您只有两个标签都匹配的查询集.从以下问题复制的方法: Django查询集以匹配所有相关对象

That should filter the queryset so that you only have a queryset where both tags match. The method copied from this quesiton: Django queryset to match all related objects

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