I am trying to build activity logs by a User or any other model object, to
which a user can follow/subscribe.
These are the models related with logging the activities and following them:
*class Activity(models.Model): """ An activity log : Actor acts on
target Actor can be a User or a model Object """
actor_content_type = models.ForeignKey( ContentType,
on_delete=models.CASCADE, related_name="actor_type") actor_object_id =
models.PositiveIntegerField() actor =
GenericForeignKey('actor_content_type', 'actor_object_id') description =
models.TextField() target_content_type = models.ForeignKey(
ContentType, on_delete=models.CASCADE, related_name="target_type")
target_object_id = models.PositiveIntegerField() target =
GenericForeignKey('target_content_type', 'target_object_id')*
* timestamp = models.DateTimeField(auto_now_add=True)*
*class Follow(models.Model): """ A user can follow any User or model
objects. """ user = models.ForeignKey(User,
on_delete=models.CASCADE) content_type = models.ForeignKey(ContentType,
on_delete=models.CASCADE) object_id = models.PositiveIntegerField()
follow_object = GenericForeignKey('content_type', 'object_id')*
Suppose:
- Thor follows user Loki // User follows User
- Thor follows user Stark // User follows User
- Thor follows project Avenger // User follows Project
And suppose these are activities:
- Nick Fury Created a project "Shield"
- Nick Fury Created a project "Avengers"
- Stark created a project "Mark II"
- Avengers added Vision
- Dr Strange created a project Dormammu
I can get the user *Thor* :
*thor = User.objects.get(email="t...@gmail.com")*
And get the list of users/objects followed by *Thor*:
*thor.follow_set.all() *
*<QuerySet [<Follow: t...@gmail.com follows l...@gmail.com>, <Follow:
t...@gmail.com follows st...@gmail.com>, <Follow: t...@gmail.com follows
Avengers>]> *
Now to get the list of activities followed by the user Thor, I tried this:
* q = Q(actor__in=thor.follow_set.all())| Q(target__in=
thor.follow_set.all()) *
*Activity.objects.filter(q) *
But its throwing an error:
*FieldError: Field 'actor' does not generate an automatic reverse relation
and therefore cannot be used for reverse querying. If it is a
GenericForeignKey, consider adding a GenericRelation.*
I can get all the activities for a single object followed by user Thor:
*followed_last = thor.follow_set.last().follow_object *
*q = Q(actor_content_type=ContentType.objects.get_for_model(followed_last),
actor_object_id=followed_last.id)|
Q(target_content_type=ContentType.objects.get_for_model(followed_last),
target_object_id=followed_last.id)) *
* Activity.objects.filter(q)*
*<QuerySet [<Activity: Avengers Added vis...@gmail.com>, <Activity:
nickf...@gmail.om Created Avengers>]> *
But how can I get all the activities Thor is following from the above
activities:
- Nick Fury Created a project "Avengers"
- Stark created a project "Mark II"
- Avengers added Vision
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