✨ 모각코 참가 취소 구현 및 Swagger

app/backend/src/mogaco/mogaco.controller.ts

@@ -103,4 +103,17 @@ export class MogacoController {
   async getParticipants(@Param('id', ParseIntPipe) id: number): Promise<Member[]> {
     return this.mogacoService.getParticipants(id);
   }
+
+  @Delete('/:id/join')
+  @ApiOperation({
+    summary: '모각코 참가 취소',
+    description: '특정 모각코 참가를 취소합니다.',
+  })
+  @ApiParam({ name: 'id', description: '참가를 취소할 모각코의 Id' })
+  @ApiResponse({ status: 200, description: 'Successfully cancelled join' })
+  @ApiResponse({ status: 401, description: 'Unauthorized' })
+  @ApiResponse({ status: 403, description: 'Forbidden' })
+  async cancelMogacoJoin(@Param('id', ParseIntPipe) id: number, @GetUser() member: Member): Promise<void> {
+    return this.mogacoService.cancelMogacoJoin(id, member);
+  }
 }

app/backend/src/mogaco/mogaco.repository.ts

@@ -145,4 +145,43 @@ export class MogacoRepository {
     // 가져온 참가자 목록의 각 참가자의 member 속성을 통해 실제 멤버 객체로 매핑하여 반환
     return participants.map((participant) => participant.member);
   }
+
+  async cancelMogacoJoin(id: number, member: Member): Promise<void> {
+    const mogaco = await this.prisma.mogaco.findUnique({
+      where: { id, deletedAt: null },
+      include: {
+        member: true,
+      },
+    });
+
+    if (!mogaco) {
+      throw new NotFoundException(`Mogaco with id ${id} not found`);
+    }
+
+    const participant = await this.prisma.participant.findUnique({
+      where: {
+        postId_userId: {
+          postId: mogaco.id,
+          userId: member.id,
+        },
+      },
+    });
+
+    if (!participant) {
+      throw new NotFoundException(`Member with id ${member.id} is not participating in Mogaco with id ${id}`);
+    }
+
+    if (mogaco.memberId !== member.id) {
+      throw new ForbiddenException(`You do not have permission to cancel participation in this Mogaco`);
+    }
+
+    await this.prisma.participant.delete({
+      where: {
+        postId_userId: {
+          postId: mogaco.id,
+          userId: member.id,
+        },
+      },
+    });
+  }
 }

app/backend/src/mogaco/mogaco.service.ts

@@ -37,4 +37,8 @@ export class MogacoService {
   async getParticipants(id: number): Promise<Member[]> {
     return this.mogacoRepository.getParticipants(id);
   }
+
+  async cancelMogacoJoin(id: number, member: Member): Promise<void> {
+    return this.mogacoRepository.cancelMogacoJoin(id, member);
+  }
 }