So , i am trying to create the community page which is created by the admin , and users can join and chat there but creation of community is successful but the joining is not happening, i am using the prisma and mongodb for that
the model is following

model Community {
  id            String   @id @default(auto()) @map("_id") @db.ObjectId
  createdAt     DateTime @default(now())
  lastmessageAt DateTime @default(now())
  name          String   @unique
  description   String?
  isCommunity   Boolean?

  messagesIds String?   @db.ObjectId
  messages    Message[]

  userIds String[] @db.ObjectId
  users   User[]   @relation(fields: [userIds], references: [id])
}

model Message {
  id        String   @id @default(auto()) @map("_id") @db.ObjectId
  content   String
  createdAt DateTime @default(now())

  seenIds String[] @db.ObjectId
  seen    User[]   @relation("Seen", fields: [seenIds], references: [id])

  communityId String    @db.ObjectId
  community   Community @relation(fields: [communityId], references: [id], onDelete: Cascade)

  senderId String @db.ObjectId
  sender   User   @relation(fields: [senderId], references: [id], onDelete: Cascade)
}

model User {
  id             String    @id @default(auto()) @map("_id") @db.ObjectId
  email          String?   @unique
  name           String?
  phone          String?
  hashedPassword String?
  role           String?
  posts          Modules[]
  userInfo       UserInfo?
  accounts       Account[]

  communityIds String[]    @db.ObjectId
  communities  Community[] @relation(fields: [communityIds], references: [id])

  seenMessageIds String[]  @db.ObjectId
  seenMessages   Message[] @relation("Seen", fields: [seenMessageIds], references: [id])

  messages Message[]
}

this is my schema for that
also creation of communities is successfull but joining is not happening by the user.

{
  "communities": [
    {
      "id": "66841e94362a692ec1d5431b",
      "createdAt": "2024-07-02T15:36:52.271Z",
      "lastmessageAt": "2024-07-02T15:36:52.271Z",
      "name": "web dev comm",
      "description": "deepverse the web dev community",
      "isCommunity": null,
      "messagesIds": null,
      "userIds": []
    }
  ]
}

To create the api route to join the users in that community and to leave from that community
the folder structure i am using is app/api/community/[communityId]/join/route.ts
and for leave is app/api/community/[communityId]/leave/route.ts