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perf(M3UAccountSerializer): optimize stream count retrieval to avoid redundant queries

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SergeantPanda 2026-05-02 11:51:13 -05:00
parent d08298b9c3
commit d0ce2fdd6d
1 changed files with 16 additions and 12 deletions
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28
apps/m3u/serializers.py
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@ -193,19 +193,23 @@ class M3UAccountSerializer(serializers.ModelSerializer):
}
def to_representation(self, instance):
# Pre-aggregate stream counts for this account so the nested
# ChannelGroupM3UAccountSerializer does not issue a COUNT per group.
from django.db.models import Count
from apps.channels.models import Stream
# When the list() view pre-aggregates stream counts for all accounts
# in a single query, it seeds "stream_counts" into the context before
# serialization. Avoid issuing a redundant per-instance COUNT in that
# case. The per-instance fallback handles direct serialization (e.g.
# retrieve, create) where only one account is in scope.
if "stream_counts" not in self.context:
from django.db.models import Count
from apps.channels.models import Stream
counts_qs = (
Stream.objects.filter(m3u_account_id=instance.id)
.values("channel_group_id")
.annotate(c=Count("id"))
)
self.context["stream_counts"] = {
(instance.id, row["channel_group_id"]): row["c"] for row in counts_qs
}
counts_qs = (
Stream.objects.filter(m3u_account_id=instance.id)
.values("channel_group_id")
.annotate(c=Count("id"))
)
self.context["stream_counts"] = {
(instance.id, row["channel_group_id"]): row["c"] for row in counts_qs
}
data = super().to_representation(instance)