refactoring

Resolve #7779

packages/backend/src/server/api/common/generate-channel-query.ts

@@ -0,0 +1,24 @@
+import { User } from '@/models/entities/user';
+import { ChannelFollowings } from '@/models/index';
+import { Brackets, SelectQueryBuilder } from 'typeorm';
+
+export function generateChannelQuery(q: SelectQueryBuilder<any>, me?: { id: User['id'] } | null) {
+	if (me == null) {
+		q.andWhere('note.channelId IS NULL');
+	} else {
+		q.leftJoinAndSelect('note.channel', 'channel');
+
+		const channelFollowingQuery = ChannelFollowings.createQueryBuilder('channelFollowing')
+			.select('channelFollowing.followeeId')
+			.where('channelFollowing.followerId = :followerId', { followerId: me.id });
+
+		q.andWhere(new Brackets(qb => { qb
+			// チャンネルのノートではない
+			.where('note.channelId IS NULL')
+			// または自分がフォローしているチャンネルのノート
+			.orWhere(`note.channelId IN (${ channelFollowingQuery.getQuery() })`);
+		}));
+
+		q.setParameters(channelFollowingQuery.getParameters());
+	}
+}