backend/src/entities/comment.entity.ts

import {
  Entity,
  Column,
  PrimaryGeneratedColumn,
  CreateDateColumn,
  UpdateDateColumn,
  ManyToOne,
  JoinColumn,
  OneToMany,
} from 'typeorm';
import { User } from './user.entity';
import { Course } from './course.entity';

@Entity('comments')
export class Comment {
  @PrimaryGeneratedColumn()
  id: number;

  @Column({ name: 'course_id' })
  courseId: number;

  @Column({ name: 'user_id' })
  userId: number;

  @Column({ name: 'parent_id', nullable: true })
  parentId: number;

  @Column({ name: 'reply_to_comment_id', nullable: true })
  replyToCommentId: number;

  @Column({ type: 'text' })
  content: string;

  @CreateDateColumn({ name: 'created_at' })
  createdAt: Date;

  @UpdateDateColumn({ name: 'updated_at' })
  updatedAt: Date;

  @ManyToOne(() => User, (user) => user.comments)
  @JoinColumn({ name: 'user_id' })
  user: User;

  @ManyToOne(() => Course, (course) => course.comments)
  @JoinColumn({ name: 'course_id' })
  course: Course;

  @ManyToOne(() => Comment, (comment) => comment.replies)
  @JoinColumn({ name: 'parent_id' })
  parent: Comment;

  @ManyToOne(() => Comment)
  @JoinColumn({ name: 'reply_to_comment_id' })
  replyToComment: Comment;

  @OneToMany(() => Comment, (comment) => comment.parent)
  replies: Comment[];
}