#1720 #59

src/services/register-hashtag.ts

@@ -0,0 +1,28 @@
+import { IUser } from '../models/user';
+import Hashtag from '../models/hashtag';
+
+export default async function(user: IUser, tag: string) {
+	tag = tag.toLowerCase();
+
+	const index = await Hashtag.findOne({ tag });
+
+	if (index != null) {
+		// 自分が初めてこのタグを使ったなら
+		if (!index.mentionedUserIds.some(id => id.equals(user._id))) {
+			Hashtag.update({ tag }, {
+				$push: {
+					mentionedUserIds: user._id
+				},
+				$inc: {
+					mentionedUserIdsCount: 1
+				}
+			});
+		}
+	} else {
+		Hashtag.insert({
+			tag,
+			mentionedUserIds: [user._id],
+			mentionedUserIdsCount: 1
+		});
+	}
+}