Server/prisma/schema.prisma

generator client {
    provider = "prisma-client-js"
}

datasource db {
    provider = "mysql"
    url      = env("DATABASE_URL")
}

model User {
    id         String   @id @default(cuid())
    username   String?  @unique
    role       Role     @default(STUDENT)
    createdAt  DateTime @default(now())
    providerId String   @unique

    Class                Class[]
    SentMessages         UserMessage[]          @relation("SentMessages")
    ReceivedMessages     UserMessage[]          @relation("ReceivedMessages")
    RoomSurveyAnswerUser RoomSurveyAnswerUser[]
}

model UserMessage {
    id      Int    @id @default(autoincrement())
    content String

    sender         User   @relation(fields: [sender_user_Id], references: [id], name: "SentMessages")
    sender_user_Id String

    receiver         User   @relation(fields: [receiver_user_Id], references: [id], name: "ReceivedMessages")
    receiver_user_Id String

    createdAt DateTime @default(now())
}

model Class {
    id        String   @id @default(cuid())
    name      String
    createdAt DateTime @default(now())

    ClassRoom Room[]
    Students  User[]
}

model Room {
    id        String         @id @default(cuid())
    name      String
    Class     Class[]
    Messages  RoomMessage[]
    Documents RoomDocument[]
    Surveys   RoomSurvey[]
}

model RoomMessage {
    id      Int    @id @default(autoincrement())
    content String
    Room    Room   @relation(fields: [roomId], references: [id])
    roomId  String
}

model RoomDocument {
    id      Int    @id @default(autoincrement())
    content String
    Room    Room   @relation(fields: [roomId], references: [id])
    roomId  String
}

model RoomSurvey {
    id        Int       @id @default(autoincrement())
    content   String
    Room      Room      @relation(fields: [roomId], references: [id])
    roomId    String
    createdAt DateTime  @default(now())
    endAt     DateTime?

    Answers RoomSurveyAnswer[]
}

model RoomSurveyAnswer {
    id       Int                    @id @default(autoincrement())
    content  String
    Survey   RoomSurvey             @relation(fields: [surveyId], references: [id])
    surveyId Int
    isRight  Boolean
    Users    RoomSurveyAnswerUser[]
}

model RoomSurveyAnswerUser {
    id       Int              @id @default(autoincrement())
    User     User             @relation(fields: [userId], references: [id])
    userId   String
    Answer   RoomSurveyAnswer @relation(fields: [answerId], references: [id])
    answerId Int
}

enum Role {
    STUDENT
    ADMIN
}