num/cloudfunctions/getReferrerInfo/index.js

const cloud = require('wx-server-sdk');
cloud.init({ env: cloud.DYNAMIC_CURRENT_ENV });
const db = cloud.database();

// 通过推广码查询上级信息（分享提示用）
exports.main = async (event) => {
  const { referralCode } = event;

  try {
    const res = await db.collection('users').where({
      referralCode,
    }).get();

    if (res.data.length === 0) {
      return { found: false };
    }

    const user = res.data[0];
    return {
      found: true,
      name: user.nickName || '能量师',
    };
  } catch (err) {
    return { found: false, error: err.message };
  }
};