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from django.db import models
class TimelineEvent(models.Model):
"""
Something that has happened to an identity that we want them to see on one
or more timelines, like posts, likes and follows.
"""
class Types(models.TextChoices):
post = "post"
mention = "mention"
like = "like"
follow = "follow"
boost = "boost"
# The user this event is for
identity = models.ForeignKey(
"users.Identity",
on_delete=models.CASCADE,
related_name="timeline_events",
)
# What type of event it is
type = models.CharField(max_length=100, choices=Types.choices)
# The subject of the event (which is used depends on the type)
subject_post = models.ForeignKey(
"activities.Post",
on_delete=models.CASCADE,
blank=True,
null=True,
related_name="timeline_events_about_us",
)
subject_identity = models.ForeignKey(
"users.Identity",
on_delete=models.CASCADE,
blank=True,
null=True,
related_name="timeline_events_about_us",
)
created = models.DateTimeField(auto_now_add=True)
class Meta:
index_together = [
# This relies on a DB that can use left subsets of indexes
("identity", "type", "subject_post", "subject_identity"),
("identity", "type", "subject_identity"),
]
### Alternate constructors ###
@classmethod
def add_follow(cls, identity, source_identity):
"""
Adds a follow to the timeline if it's not there already
"""
return cls.objects.get_or_create(
identity=identity,
type=cls.Types.follow,
subject_identity=source_identity,
)[0]
@classmethod
def add_post(cls, identity, post):
"""
Adds a post to the timeline if it's not there already
"""
return cls.objects.get_or_create(
identity=identity,
type=cls.Types.post,
subject_post=post,
)[0]
@classmethod
def add_like(cls, identity, post):
"""
Adds a like to the timeline if it's not there already
"""
return cls.objects.get_or_create(
identity=identity,
type=cls.Types.like,
subject_post=post,
)[0]
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