server/app/service/trade/coupon.js

'use strict';
const { CrudService } = require('naf-framework-mongoose-free/lib/service');
const { BusinessError, ErrorCode } = require('naf-core').Error;
const _ = require('lodash');
const assert = require('assert');
const moment = require('moment');

//
class CouponService extends CrudService {
  constructor(ctx) {
    super(ctx, 'coupon');
    this.model = this.ctx.model.Trade.Coupon;
    this.userCouponModel = this.ctx.model.User.UserCoupon;
  }

  async userView(filter, { skip = 0, limit, sort, desc, projection } = {}) {
    const customer = _.get(this.ctx, 'user._id');
    if (!customer) throw new BusinessError(ErrorCode.NOT_LOGIN, '未找到用户登陆信息');
    let list = await this.query(filter, { skip, limit, sort, desc, projection });
    list = await this.makeShowData(list);
    // 还需要判断用户是否领取过了
    for (const coupon of list) {
      const { get_limit, get_limit_config } = coupon;
      if (get_limit === 'nolimit') coupon.canGet = true;
      else {
        const max = _.get(get_limit_config, 'max', 1);
        const num = await this.userCouponModel.count({ coupon: coupon._id, customer });
        if (this.ctx.minus(num, max) >= 0) coupon.canGet = false;
        else coupon.canGet = true;
      }
    }
    return list;
  }


  async makeShowData(couponList) {
    const dictDataModel = this.ctx.model.Dev.DictData;
    // 过期字典
    const expList = await dictDataModel.find({ code: 'coupon_expire_type' });
    // 减免字典
    const disList = await dictDataModel.find({ code: 'coupon_discount_type' });
    // 使用字典
    const useList = await dictDataModel.find({ code: 'coupon_use_limit' });
    // 领取字典
    const getList = await dictDataModel.find({ code: 'coupon_get_limit' });
    couponList = couponList.map(coupon => {
      const { _id } = coupon;
      let obj = { _id, name: _.get(coupon, 'name') };
      // 失效
      const expire_type = _.get(coupon, 'expire_type');
      const expire_type_label = _.get(
        expList.find(f => f.value === expire_type),
        'label'
      );
      let expire_time = _.get(coupon, `expire_config.${expire_type}`);
      if (expire_time) {
        if (expire_type === 'fixed') expire_time = expire_time.join(' 至 ');
      }
      obj = { ...obj, expire_type, expire_type_label, expire_time };
      // 减免
      const discount_type = _.get(coupon, 'discount_type');
      const discount_type_label = _.get(
        disList.find(f => f.value === discount_type),
        'label'
      );
      const discount_config = _.get(coupon, 'discount_config');
      obj = { ...obj, discount_type, discount_type_label, discount_config };
      // 使用
      const use_limit = _.get(coupon, 'use_limit');
      const use_limit_label = _.get(
        useList.find(f => f.value === use_limit),
        'label'
      );
      const use_limit_config = _.get(coupon, 'use_limit_config');
      obj = { ...obj, use_limit, use_limit_label, use_limit_config };

      // 领取
      const get_limit = _.get(coupon, 'get_limit');
      const get_limit_label = _.get(
        getList.find(f => f.value === get_limit),
        'label'
      );
      const get_limit_config = _.get(coupon, 'get_limit_config');
      obj = { ...obj, get_limit, get_limit_label, get_limit_config };
      return obj;
    });
    return couponList;
  }
}

module.exports = CouponService;