Solved some bugs related to the payment page

src/pages/api/groups/index.ts

@@ -1,7 +1,7 @@
 // Next.js API route support: https://nextjs.org/docs/api-routes/introduction
 import type {NextApiRequest, NextApiResponse} from "next";
 import {app} from "@/firebase";
-import {getFirestore, collection, getDocs, setDoc, doc} from "firebase/firestore";
+import {getFirestore, collection, getDocs, setDoc, doc, query, where} from "firebase/firestore";
 import {withIronSessionApiRoute} from "iron-session/next";
 import {sessionOptions} from "@/lib/session";
 import {Group} from "@/interfaces/user";
@@ -22,25 +22,19 @@ async function handler(req: NextApiRequest, res: NextApiResponse) {
 }
 
 async function get(req: NextApiRequest, res: NextApiResponse) {
-	const {admin} = req.query as {admin: string};
-	const snapshot = await getDocs(collection(db, "groups"));
+	const {admin, participant} = req.query as {admin: string; participant: string};
 
-	const groups: Group[] = snapshot.docs.map((doc) => ({
+	const queryConstraints = [
+		...(admin ? [where("admin", "==", admin)] : []),
+		...(participant ? [where("participants", "array-contains", participant)] : []),
+	];
+	const snapshot = await getDocs(queryConstraints.length > 0 ? query(collection(db, "groups"), ...queryConstraints) : collection(db, "groups"));
+	const groups = snapshot.docs.map((doc) => ({
 		id: doc.id,
 		...doc.data(),
 	})) as Group[];
 
-	if (admin) {
-		res.status(200).json(groups.filter((x) => x.admin === admin));
-		return;
-	}
-
-	res.status(200).json(
-		snapshot.docs.map((doc) => ({
-			id: doc.id,
-			...doc.data(),
-		})),
-	);
+	res.status(200).json(groups);
 }
 
 async function post(req: NextApiRequest, res: NextApiResponse) {