boostcampwm-snu-2026-1 · peterabcd · Jul 1, 2026 · Jul 1, 2026
diff --git a/app/sessions/_components/FilterBar.tsx b/app/sessions/_components/FilterBar.tsx
@@ -11,7 +11,7 @@ type Member = {
 
 type Props = {
   q: string;
-  memberId: string;
+  memberIds: string[];
   month: string;
   pmin: string;
   pmax: string;
@@ -20,13 +20,13 @@ type Props = {
 };
 
 /**
- * /sessions 상단 필터. GET form 으로 제출 → URL ?q=&member=&month=&pmin=&pmax= 갱신.
+ * /sessions 상단 필터. GET form 으로 제출 → URL ?q=&member=&member=&month=&pmin=&pmax= 갱신.
  * Server-rendered, 별도 client component 없음. 필터 변경 시 cursor 는 자동으로 리셋
  * (form 이 cursor 를 hidden 으로 안 들고 가니까).
  */
 export function FilterBar({
   q,
-  memberId,
+  memberIds,
   month,
   pmin,
   pmax,
@@ -53,24 +53,41 @@ export function FilterBar({
           />
         </div>
 
-        <div className="flex flex-col gap-1">
-          <Label htmlFor="f-member" className="text-xs">
+        <fieldset className="flex flex-col gap-2 sm:col-span-2">
+          <legend className="text-xs font-medium text-[#1d1d1f]">
             참여 멤버
-          </Label>
-          <select
-            id="f-member"
-            name="member"
-            defaultValue={memberId}
-            className="flex h-9 w-full rounded-md border border-input bg-background px-3 py-1 text-sm shadow-sm transition-colors focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring"
-          >
-            <option value="">전체</option>
-            {members.map((m) => (
-              <option key={m.id} value={m.id}>
-                {m.name}
-              </option>
-            ))}
-          </select>
-        </div>
+          </legend>
+          {members.length > 0 ? (
+            <div className="flex flex-wrap gap-2">
+              {members.map((m) => {
+                const inputId = `f-member-${m.id}`;
+                return (
+                  <div key={m.id} className="relative">
+                    <input
+                      id={inputId}
+                      name="member"
+                      type="checkbox"
+                      value={m.id}
+                      defaultChecked={memberIds.includes(m.id)}
+                      className="peer sr-only"
+                    />
+                    <Label
+                      htmlFor={inputId}
+                      className="inline-flex min-h-9 cursor-pointer items-center rounded-full border border-[#e0e0e0] bg-white px-4 py-2 text-sm text-[#1d1d1f] transition-colors peer-checked:border-[#0066cc] peer-checked:text-[#0066cc] peer-focus-visible:outline peer-focus-visible:outline-2 peer-focus-visible:outline-offset-2 peer-focus-visible:outline-[#0071e3]"
+                    >
+                      {m.name}
+                    </Label>
+                  </div>
+                );
+              })}
+            </div>
+          ) : (
+            <p className="text-xs text-[#7a7a7a]">승인된 멤버가 없어요.</p>
+          )}
+          <p className="text-xs text-[#7a7a7a]">
+            여러 명을 선택하면 모두 참여한 세션만 보여줘요.
+          </p>
+        </fieldset>
 
         <div className="flex flex-col gap-1">
           <Label htmlFor="f-month" className="text-xs">

diff --git a/app/sessions/page.tsx b/app/sessions/page.tsx
@@ -21,6 +21,7 @@ type PageProps = {
   searchParams: Promise<SearchParams>;
 };
 
+
 export default async function SessionsArchivePage({ searchParams }: PageProps) {
   await requireApproved();
 
@@ -53,11 +54,11 @@ export default async function SessionsArchivePage({ searchParams }: PageProps) {
       </header>
 
       <FilterBar
-        q={sp.q ?? ""}
-        memberId={sp.member ?? ""}
-        month={sp.month ?? ""}
-        pmin={sp.pmin ?? ""}
-        pmax={sp.pmax ?? ""}
+        q={filters.q ?? ""}
+        memberIds={filters.memberIds ?? []}
+        month={filters.month ?? ""}
+        pmin={filters.pmin != null ? String(filters.pmin) : ""}
+        pmax={filters.pmax != null ? String(filters.pmax) : ""}
         members={members}
         hasActiveFilters={hasActiveFilters}
       />

diff --git a/lib/session-filters.ts b/lib/session-filters.ts
@@ -1,17 +1,19 @@
+type SearchParamValue = string | string[] | undefined;
+
 export type SessionArchiveSearchParams = {
-  cursor?: string;
-  q?: string;
-  member?: string;
-  month?: string;
-  pmin?: string;
-  pmax?: string;
+  cursor?: SearchParamValue;
+  q?: SearchParamValue;
+  member?: SearchParamValue;
+  month?: SearchParamValue;
+  pmin?: SearchParamValue;
+  pmax?: SearchParamValue;
 };
 
 export type ParsedSessionArchiveParams = {
   cursorId?: number;
   filters: {
     q?: string;
-    memberId?: string;
+    memberIds?: string[];
     month?: string;
     pmin?: number;
     pmax?: number;
@@ -22,20 +24,21 @@ export type ParsedSessionArchiveParams = {
 export function parseSessionArchiveParams(
   params: SessionArchiveSearchParams,
 ): ParsedSessionArchiveParams {
+  const memberIds = parseStringListParam(params.member);
   const filters = {
-    q: params.q?.trim() || undefined,
-    memberId: params.member?.trim() || undefined,
-    month: parseMonthParam(params.month) ?? undefined,
-    pmin: parseNonNegativeInt(params.pmin),
-    pmax: parseNonNegativeInt(params.pmax),
+    q: firstSearchParam(params.q)?.trim() || undefined,
+    memberIds: memberIds.length > 0 ? memberIds : undefined,
+    month: parseMonthParam(firstSearchParam(params.month)) ?? undefined,
+    pmin: parseNonNegativeInt(firstSearchParam(params.pmin)),
+    pmax: parseNonNegativeInt(firstSearchParam(params.pmax)),
   };
 
   return {
-    cursorId: parsePositiveInt(params.cursor),
+    cursorId: parsePositiveInt(firstSearchParam(params.cursor)),
     filters,
     hasActiveFilters: Boolean(
       filters.q ||
-        filters.memberId ||
+        filters.memberIds?.length ||
         filters.month ||
         filters.pmin != null ||
         filters.pmax != null,
@@ -44,12 +47,15 @@ export function parseSessionArchiveParams(
 }
 
 export function buildSessionArchiveHref(
-  params: Record<string, string | undefined>,
+  params: Record<string, SearchParamValue>,
 ): string {
   const q = new URLSearchParams();
   for (const [key, value] of Object.entries(params)) {
-    const trimmed = value?.trim();
-    if (trimmed) q.set(key, trimmed);
+    const values = Array.isArray(value) ? value : [value];
+    for (const item of values) {
+      const trimmed = item?.trim();
+      if (trimmed) q.append(key, trimmed);
+    }
   }
   const query = q.toString();
   return query ? `/sessions?${query}` : "/sessions";
@@ -72,6 +78,27 @@ export function parseMonthRange(month: string | undefined): {
   };
 }
 
+function firstSearchParam(raw: SearchParamValue): string | undefined {
+  if (Array.isArray(raw)) {
+    return raw.find((value) => value.trim());
+  }
+  return raw;
+}
+
+function parseStringListParam(raw: SearchParamValue): string[] {
+  const values = Array.isArray(raw) ? raw : raw ? [raw] : [];
+  const seen = new Set<string>();
+  const parsed: string[] = [];
+
+  for (const value of values) {
+    const trimmed = value.trim();
+    if (!trimmed || seen.has(trimmed)) continue;
+    seen.add(trimmed);
+    parsed.push(trimmed);
+  }
+
+  return parsed;
+}
 function parseMonthParam(raw: string | undefined): string | null {
   const value = raw?.trim();
   if (!value) return null;

diff --git a/lib/sessions.ts b/lib/sessions.ts
@@ -32,14 +32,14 @@ export type SessionListPage = {
 /**
  * /sessions 아카이브 필터.
  *   - q          : 장소 substring (case-insensitive ASCII / 한글 그대로)
- *   - memberId   : 해당 user 가 *참여한* 세션만
+ *   - memberIds  : 선택한 모든 user 가 *참여한* 세션만
  *   - month      : "YYYY-MM" — 해당 달의 세션만 (UTC 기준; 동아리는 KST 라 거의 일치)
  *   - pmin/pmax  : 참여 인원 수 범위. Prisma 가 relation _count where 를 직접
  *                  지원 안 해서 raw 로 ID 만 따로 추출한 뒤 IN 으로 필터.
  */
 export type SessionFilters = {
   q?: string;
-  memberId?: string;
+  memberIds?: string[];
   month?: string;
   pmin?: number;
   pmax?: number;
@@ -75,10 +75,12 @@ function buildWhere(
   if (filters?.q && filters.q.trim()) {
     where.location = { contains: filters.q.trim() };
   }
-  if (filters?.memberId) {
-    where.participations = {
-      some: { userId: filters.memberId },
-    };
+  if (filters?.memberIds?.length) {
+    where.AND = filters.memberIds.map((userId) => ({
+      participations: {
+        some: { userId },
+      },
+    }));
   }
   const range = parseMonthRange(filters?.month);
   if (range) {

diff --git a/test/form-and-filter.test.tsx b/test/form-and-filter.test.tsx
@@ -43,7 +43,7 @@ describe("FilterBar", () => {
     render(
       <FilterBar
         q="서울숲"
-        memberId="u2"
+        memberIds={["u1", "u2"]}
         month="2026-06"
         pmin="2"
         pmax="8"
@@ -56,9 +56,8 @@ describe("FilterBar", () => {
     );
 
     expect(screen.getByLabelText("장소")).toHaveValue("서울숲");
-    expect(screen.getByRole("combobox", { name: "참여 멤버" })).toHaveValue(
-      "u2",
-    );
+    expect(screen.getByRole("checkbox", { name: "민지" })).toBeChecked();
+    expect(screen.getByRole("checkbox", { name: "현민" })).toBeChecked();
     expect(screen.getByLabelText("월")).toHaveValue("2026-06");
     expect(screen.getByLabelText("참여 인원 최소")).toHaveValue(2);
     expect(screen.getByLabelText("참여 인원 최대")).toHaveValue(8);
@@ -72,7 +71,7 @@ describe("FilterBar", () => {
     render(
       <FilterBar
         q=""
-        memberId=""
+        memberIds={[]}
         month=""
         pmin=""
         pmax=""

diff --git a/test/session-filters.test.ts b/test/session-filters.test.ts
@@ -11,7 +11,7 @@ describe("session archive filter parsing", () => {
     const parsed = parseSessionArchiveParams({
       cursor: "12",
       q: " 서울숲 ",
-      member: "user-1",
+      member: ["user-1", " user-2 ", "user-1", ""],
       month: "2026-06",
       pmin: "2",
       pmax: "10",
@@ -21,7 +21,7 @@ describe("session archive filter parsing", () => {
       cursorId: 12,
       filters: {
         q: "서울숲",
-        memberId: "user-1",
+        memberIds: ["user-1", "user-2"],
         month: "2026-06",
         pmin: 2,
         pmax: 10,
@@ -42,7 +42,7 @@ describe("session archive filter parsing", () => {
       cursorId: undefined,
       filters: {
         q: undefined,
-        memberId: undefined,
+        memberIds: undefined,
         month: undefined,
         pmin: undefined,
         pmax: undefined,
@@ -64,10 +64,12 @@ describe("session archive filter parsing", () => {
     expect(
       buildSessionArchiveHref({
         q: "서울숲",
-        member: "",
+        member: ["u1", "", "u2"],
         month: "2026-06",
         cursor: "25",
       }),
-    ).toBe("/sessions?q=%EC%84%9C%EC%9A%B8%EC%88%B2&month=2026-06&cursor=25");
+    ).toBe(
+      "/sessions?q=%EC%84%9C%EC%9A%B8%EC%88%B2&member=u1&member=u2&month=2026-06&cursor=25",
+    );
   });
 });