Video.isLikedの認証をoptionalに

src/Video/Video.graphql

@@ -11,7 +11,9 @@ type Video implements Node {
   events(input: VideoEventsInput!): VideoEventsConnection!
   registeredAt: DateTime!
 
-  isLiked: Boolean! @auth
+  "現在ログイン中のユーザがいいね済みかどうか．認証していない場合は`null`"
+  isLiked: Boolean @auth(optional: true)
+
   like: MylistRegistration @auth
 
   nicovideoSources: [NicovideoVideoSource!]!

src/Video/Video.resolver.ts

@@ -114,7 +114,7 @@
   }) satisfies VideoResolvers["similarVideos"];
 
 export const resolveTaggings = ({ prisma, logger }: Pick<ResolverDeps, "prisma" | "logger">) =>
   (async ({ id: videoId }, { orderBy: unparsedOrderBy, ...unparsedConnectionArgs }, { currentUser: ctxUser }, info) => {
     const connectionArgs = z
       .union([
         z.object({
@@ -166,7 +166,8 @@
   neo4j,
   logger,
   ImagesService,
-}: Pick<ResolverDeps, "prisma" | "neo4j" | "logger" | "ImagesService">) =>
+  VideoService,
+}: Pick<ResolverDeps, "prisma" | "neo4j" | "logger" | "ImagesService" | "VideoService">) =>
   ({
     id: ({ id }): string => buildGqlId("Video", id),
 
@@ -229,7 +230,10 @@
         .then((es) => es.map((e) => new VideoEventDTO(e)));
       return { nodes };
     },
-
-    isLiked: resolveVideoIsLiked({ prisma, logger }),
+    isLiked: async ({ id: videoId }, _args, { currentUser }) => {
+      if (!currentUser) return null;
+      const like = await VideoService.findLike({ videoId, holderId: currentUser.id });
+      return !!like;
+    },
     like: resolveVideoLike({ prisma, logger }),
   }) satisfies Resolvers["Video"];

src/Video/Video.service.ts

@@ -1,5 +1,6 @@
 import { PrismaClient } from "@prisma/client";
 
+import { MylistRegistrationModel } from "../resolvers/MylistRegistration/model.js";
 import { VideoDTO } from "../Video/dto.js";
 
 export const mkVideoService = ({ prisma }: { prisma: PrismaClient }) => {
@@ -34,6 +35,12 @@ export const mkVideoService = ({ prisma }: { prisma: PrismaClient }) => {
         nodes: nodes.map((v) => VideoDTO.fromPrisma(v)),
       };
     },
+    async findLike({ videoId, holderId }: { videoId: string; holderId: string }) {
+      const registration = await prisma.mylistRegistration.findFirst({
+        where: { mylist: { slug: "likes", holderId }, videoId, isRemoved: false },
+      });
+      return registration ? MylistRegistrationModel.fromPrisma(registration) : null;
+    },
   };
 };