Graphql 使用TypeORM getManyWithCount如何为分页生成PageInfo

我正在为GraphQL服务器实现中继式分页，并使用优秀的TypeORM库

我想找到在查询后创建PageInfo对象的最佳方法：

type PageInfo {
  endCursor: String
  hasNextPage: Boolean!
  hasPreviousPage: Boolean!
  startCursor: String
}

---

这将非常有效，但请记住，

totalEntitiesCount

不是表中所有条目的计数，而只是与光标条件匹配的条目的计数（

note.notedAt>：after

或

note.notedAt>）
if (before) {
  qb = qb.andWhere('note.notedAt <=(:before)', { before });
}

if (after) {
  qb = qb.andWhere('note.notedAt >(:after)', { after });
}

qb = qb.take(args.take)
const [entities, totalEntitesCount] = qb.getManyWithCount()

function createPageInfo(
  noteEdges: Array<{ node: Note; cursor: Date }>,
  totalCount: number,
  findOptions: NoteFindOptions
) {

  let hasNextPage: boolean;
  let hasPreviousPage: boolean;

  if(findOptions.after) {
    hasPreviousPage = true;
    hasNextPage = (noteEdges.length < totalCount)
  } else if (findOptions.before) {
    hasNextPage = true;
    hasPreviousPage = (noteEdges.length < totalCount)
  } else {
    hasPreviousPage = false;
    hasNextPage = (noteEdges.length < totalCount)
  }

  return {
    startCursor: noteEdges[0].cursor,
    endCursor: noteEdges[noteEdges.length - 1].cursor,
    hasNextPage,
    hasPreviousPage
  };
}