似乎你可以只是将您的过滤器作为 ** kwargs ：

  model_stream（FillingSystem，filling_system__client__slug ='my-slug'）
 

其中目标是一个 GenericForeignKey 到您的内容（随意选择来自其他人）。

您可能需要声明与 Action 模型的反向关系：

I would like to filter Actions for particular queryset.

To this moment I was grabbing data by generating a model stream on desired model.

model_stream(FillingSystem)

I would like to extend this functionality and have something like this

model_stream(FillingSystem.objects.filter(client__slug='my-slug')) 

or

model_stream(FillingSystem.objects.filter(client=Client.objects.get(slug='my-slug'))) 

this model looks like this:

class FillingSystem(models.Model):
    client = models.ForeignKey('accounts.Client')

How do I filter a stream by related slug field?

It seems you can just pass your filters as **kwargs:

model_stream(FillingSystem, filling_system__client__slug='my-slug')

where target is a GenericForeignKey to your content (feel free to choose from the others).

You may have to declare a reverse relation to the Action model:

from django.contrib.contenttypes.fields import GenericRelation
from actstream.models import Action

class FillingSystem(models.Model):
    client = models.ForeignKey('accounts.Client')
    stream_actions = GenericRelation(
                         Action,
                         content_type_field='target_content_type'
                         object_id_field='target_object_id'
                         related_query_name='filling_system')