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from django.db import connections, router
from django.db.models import Count
from .models import Todolist, TodolistPackage
def todo_counts():
sql = """
SELECT todolist_id, count(*), sum(CASE WHEN status = %s THEN 1 ELSE 0 END)
FROM todolists_todolistpackage
GROUP BY todolist_id
"""
database = router.db_for_write(TodolistPackage)
connection = connections[database]
cursor = connection.cursor()
cursor.execute(sql, [TodolistPackage.COMPLETE])
results = cursor.fetchall()
return {row[0]: (row[1], row[2]) for row in results}
def get_annotated_todolists(incomplete_only=False):
lists = Todolist.objects.all().select_related(
'creator').order_by('-created')
lookup = todo_counts()
# tag each list with package counts
for todolist in lists:
counts = lookup.get(todolist.id, (0, 0))
todolist.pkg_count = counts[0]
todolist.complete_count = counts[1]
todolist.incomplete_count = counts[0] - counts[1]
if incomplete_only:
lists = [l for l in lists if l.incomplete_count > 0]
return lists
# vim: set ts=4 sw=4 et:
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