双链表架构导致@BeforeRemove问题

问题描述

我目前在运行时从数据库中删除实体列表时遇到问题：

const cards = Card.find(...);
await Card.remove(cards);

某些卡未移除，并且我的卡座未更新为正确的长度。但是，当我运行时：

const cards = Card.find(...);
for (const card of cards) {
    await Card.remove(card);
}

它可以正确删除元素，因此我认为它与Card.remove(...)如何异步删除实体有关。

---

我的数据库架构中有以下双重链接列表部分，用于一副纸牌。

decks
    id (PK)
    head_card_id (FK)
    tail_card_id (FK)
    length

cards
    id (PK)
    deck_id (FK)
    next_card_id (FK)
    prev_card_id (FK)

我正在使用TypeORM定义我的实体。这是我的Card实体的定义：

@Entity('cards')
export class Card extends BaseEntity {
  @PrimaryColumn()
  id: string;

  @ManyToOne(() => Deck,(deck) => deck.cards,{ onDelete: 'CASCADE' })
  deck: Deck;
  @Column()
  deckId: string;

  @ManyToOne(() => Card,(card) => card.prevCard,{
    nullable: true,cascade: false,onDelete: 'SET NULL',})
  nextCard: Card;
  @Column({ nullable: true,default: null })
  nextCardId?: string;

  @ManyToOne(() => Card,(card) => card.nextCard,})
  prevCard: Card;
  @Column({ nullable: true,default: null })
  prevCardId?: string;

  @BeforeInsert()
  addId(): void {
    this.id = v4();
  }

  @BeforeRemove()
  async safeRemove(): Promise<void> {
    const deck = await Deck.findOneOrFail({
      where: { id: this.deckId },});
    const nextCard = await Card.findOne({
      where: { id: this.nextCardId },});
    const prevCard = await Card.findOne({
      where: { id: this.prevCardId },});
    // Card is headCard and tailCard (only card)
    if (deck.headCardId === this.id && deck.tailCardId === this.id) {
      await Deck.update(this.deckId,{
        headCardId: prevCard?.id,tailCardId: nextCard?.id,length: deck.length - 1,});
    }
    // Card is headCard in Deck
    else if (deck.headCardId === this.id) {
      await Deck.update(this.deckId,});
    }
    // Card is tailCard in Deck
    else if (deck.tailCardId === this.id) {
      await Deck.update(this.deckId,{
        tailCardId: nextCard?.id,});
    }
    // Card is not headCard or tailCard
    else {
      await Deck.update(this.decktId,{
        length: deck.length - 1,});
    }
    // Card has nextCard
    if (nextCard?.id) {
      await Card.update(nextCard.id,{
        prevCardId: prevCard?.id,});
    }
    // Card has prevCard
    if (prevCard?.id) {
      await Card.update(prevCard.id,{
        nextCardId: nextCard?.id,});
    }
  }
}

我做错了什么吗，还是有一种方法可以编写我的@BeforeRemove方法以使其正常工作？

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

如果你已经找到好的解决方法，欢迎将解决方案带上本链接一起发送给小编。

小编邮箱:dio#foxmail.com (将#修改为@）