I am building an activity model, somewhat similar to this package. It has
an actor, verb and the target.
class Activity(models.Model):
actor_type = models.ForeignKey(ContentType, related_name=
'actor_type_activities')
actor_id = models.PositiveIntegerField()
actor = GenericForeignKey('actor_type', 'actor_id')
verb = models.CharField(max_length=10)
target_type = models.ForeignKey(ContentType, related_name=
'target_type_activities')
target_id = models.PositiveIntegerField()
target = GenericForeignKey('target_type', 'target_id')
pub_date = models.DateTimeField(default=timezone.now)
Now whenever a new object of whichever models (Tender, Job and News) is
created, a new Activity object is created, with the target being the
objects of any of these three models.
eg. user (actor) published (verb) title (target)
class Job(models.Model):
user = models.ForeignKey(User)
title = models.CharField(max_length=150)
qualification = models.CharField(max_length=100)
comments = GenericRelation(Comment)
activity = GenericRelation(Activity)
class News(models.Model):
user = models.ForeignKey(User)
title = models.CharField(max_length=150)
body = models.TextField()
article_image = models.ImageField(upload_to=get_upload_file_name, blank=
True)
tags = models.ManyToManyField(Tag)
comments = GenericRelation(Comment)
activity = GenericRelation(Activity)
class Tender(models.Model):
user = models.ForeignKey(User)
title = models.CharField(max_length=150)
description = models.TextField()
comments = GenericRelation(Comment)
activity = GenericRelation(Activity)
To get this data I am making an API which will get me the required json
data. Now using django-rest-framework
class ActivitySerializer(serializers.RelatedField):
def to_representation(self, value):
if isinstance(value, User):
return 'Bookmark: ' + value.username
elif isinstance(value, News):
return 'Bookmark: ' + value.title
elif isinstance(value, Job):
return 'Note: ' + value.title
elif isinstance(value, Tender):
return 'Bookmark: ' + value.title
raise Exception('Unexpected type of tagged object')
But now I am getting this error:
*TypeError at /postactivities/*
> init() takes exactly 1 argument (3 given)
>
How can I solve this problem? Your help and guidance is very much
appreciated.
Thank you.
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