mirror of
https://github.com/jointakahe/takahe.git
synced 2024-12-01 11:41:00 +00:00
57 lines
1.9 KiB
Python
57 lines
1.9 KiB
Python
from django.db import models
|
|
|
|
|
|
class MastodonPaginator:
|
|
"""
|
|
Paginates in the Mastodon style (max_id, min_id, etc)
|
|
"""
|
|
|
|
def __init__(
|
|
self,
|
|
anchor_model: type[models.Model],
|
|
sort_attribute: str = "created",
|
|
default_limit: int = 20,
|
|
max_limit: int = 40,
|
|
):
|
|
self.anchor_model = anchor_model
|
|
self.sort_attribute = sort_attribute
|
|
self.default_limit = default_limit
|
|
self.max_limit = max_limit
|
|
|
|
def paginate(
|
|
self,
|
|
queryset,
|
|
min_id: str | None,
|
|
max_id: str | None,
|
|
since_id: str | None,
|
|
limit: int | None,
|
|
):
|
|
if max_id:
|
|
try:
|
|
anchor = self.anchor_model.objects.get(pk=max_id)
|
|
except self.anchor_model.DoesNotExist:
|
|
return []
|
|
queryset = queryset.filter(
|
|
**{self.sort_attribute + "__lt": getattr(anchor, self.sort_attribute)}
|
|
)
|
|
if since_id:
|
|
try:
|
|
anchor = self.anchor_model.objects.get(pk=since_id)
|
|
except self.anchor_model.DoesNotExist:
|
|
return []
|
|
queryset = queryset.filter(
|
|
**{self.sort_attribute + "__gt": getattr(anchor, self.sort_attribute)}
|
|
)
|
|
if min_id:
|
|
# Min ID requires items _immediately_ newer than specified, so we
|
|
# invert the ordering to accomodate
|
|
try:
|
|
anchor = self.anchor_model.objects.get(pk=min_id)
|
|
except self.anchor_model.DoesNotExist:
|
|
return []
|
|
queryset = queryset.filter(
|
|
**{self.sort_attribute + "__gt": getattr(anchor, self.sort_attribute)}
|
|
).order_by(self.sort_attribute)
|
|
else:
|
|
queryset = queryset.order_by("-" + self.sort_attribute)
|
|
return list(queryset[: min(limit or self.default_limit, self.max_limit)])
|