store_node/cloudfunctions/getGoodsDetail/index.js

// 云函数getGoodsDetail
const cloud = require('wx-server-sdk')

// 初始化cloud
cloud.init({
  env: cloud.DYNAMIC_CURRENT_ENV
})
const db = cloud.database()

exports.main = async (event, context) => {
  const { goodsId } = event
  
  if (!goodsId) {
    return {
      success: false,
      message: '参数错误'
    }
  }
  
  try {
    // 获取商品详情
    const goodsResult = await db.collection('secondhand_goods').doc(goodsId).get()
    
    if (!goodsResult.data) {
      return {
        success: false,
        message: '商品不存在'
      }
    }
    
    // 获取卖家信息
    const sellerResult = await db.collection('users').where({
      openid: goodsResult.data.openid
    }).field({
      nickName: true,
      avatarUrl: true
    }).get()
    
    const seller = sellerResult.data.length > 0 ? sellerResult.data[0] : {}
    
    return {
      success: true,
      data: {
        ...goodsResult.data,
        seller
      }
    }
  } catch (error) {
    return {
      success: false,
      message: '获取商品详情失败',
      error: error.message
    }
  }
}