polymorphic-comments.ts

export const comments: QueryResolvers['comments'] = async ({
  parentType,
  parentId,
}) => {
  const commentable = parentType[0].toLowerCase() + parentType.substring(1)

  validateWith(() => {
    if (!Object.values(Commentable).includes(commentable)) {
      throw new Error(
        'Invalid commentable passed in, check your value for parentType'
      )
    }
  })

  return db.comment.findMany({
    where: {
      [commentable + 'Id']: parentId,
    },
    orderBy: {
      createdAt: 'desc',
    },
  })
}