瑞吉外卖（八）购物车业务开发

/**
 * 根据条件查询菜品数据
 * @param dish
 * @return
 */
@GetMapping("/list")
public R<List<DishDto>> list(Dish dish){

    // 构造查询条件
    LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
    queryWrapper.eq(dish.getCategoryId() != null, Dish::getCategoryId, dish.getCategoryId());
    // 查询状态为 1（起售）
    queryWrapper.eq(Dish::getStatus, 1);

    // 添加排序条件
    queryWrapper.orderByAsc(Dish::getSort).orderByDesc(Dish::getUpdateTime);

    List<Dish> list = dishService.list(queryWrapper);

    List<DishDto> dishDtoList = list.stream().map((item) -> {
        DishDto dishDto = new DishDto();

        BeanUtils.copyProperties(item, dishDto);

        // 分类id
        Long categoryId = item.getCategoryId();
        // 根据id查询分类对象
        Category category = categoryService.getById(categoryId);

        if (category != null){
            String categoryName = category.getName();
            dishDto.setCategoryName(categoryName);
        }
        // 当前菜品id
        Long dishId = item.getId();
        LambdaQueryWrapper<DishFlavor> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.eq(DishFlavor::getDishId, dishId);

        List<DishFlavor> dishFlavorList = dishFlavorService.list(lambdaQueryWrapper);

        dishDto.setFlavors(dishFlavorList);

        return dishDto;
    }).collect(Collectors.toList());

    return R.success(dishDtoList);
}

/**
 * 根据条件查询套餐数据
 * @param setmeal
 * @return
 */
@GetMapping("/list")
public R<List<Setmeal>> list(Setmeal setmeal){
    LambdaQueryWrapper<Setmeal> queryWrapper = new LambdaQueryWrapper<>();
    queryWrapper.eq(setmeal.getCategoryId() != null, Setmeal::getCategoryId, setmeal.getCategoryId());
    queryWrapper.eq(setmeal.getStatus() != null, Setmeal::getStatus, setmeal.getStatus());
    queryWrapper.orderByDesc(Setmeal::getUpdateTime);
    List<Setmeal> list = setmealService.list(queryWrapper);
    return R.success(list);
}

{"code":1,"msg":null,"data":[],"map":{}}

//获取购物车内商品的集合
function cartListApi(data) {
    return $axios({
        // 'url': '/shoppingCart/list',
        'url': '/front/cartData.json',
        'method': 'get',
        params:{...data}
    })
}

package cn.mu00.reggie.entity;

import lombok.Data;
import java.io.Serializable;
import java.math.BigDecimal;
import java.time.LocalDateTime;

/**
 * 购物车
 */
@Data
public class ShoppingCart implements Serializable {

    private static final long serialVersionUID = 1L;

    private Long id;

    //名称
    private String name;

    //用户id
    private Long userId;

    //菜品id
    private Long dishId;

    //套餐id
    private Long setmealId;

    //口味
    private String dishFlavor;

    //数量
    private Integer number;

    //金额
    private BigDecimal amount;

    //图片
    private String image;

    private LocalDateTime createTime;
}

package cn.mu00.reggie.mapper;

import cn.mu00.reggie.entity.ShoppingCart;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import org.apache.ibatis.annotations.Mapper;

@Mapper
public interface ShoppingCartMapper extends BaseMapper<ShoppingCart> {
}

package cn.mu00.reggie.service;

import cn.mu00.reggie.entity.ShoppingCart;
import com.baomidou.mybatisplus.extension.service.IService;

public interface ShoppingCartService extends IService<ShoppingCart> {
}

package cn.mu00.reggie.service.impl;

import cn.mu00.reggie.entity.ShoppingCart;
import cn.mu00.reggie.mapper.ShoppingCartMapper;
import cn.mu00.reggie.service.ShoppingCartService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.stereotype.Service;

@Service
public class ShoppingCartServiceImpl extends ServiceImpl<ShoppingCartMapper, ShoppingCart> implements ShoppingCartService {
}

package cn.mu00.reggie.controller;

import cn.mu00.reggie.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/shoppingCart")
@Slf4j
public class ShoppingCartController {
    @Autowired
    private ShoppingCartService shoppingCartService;
}

/**
 * 购物车添加
 * @param shoppingCart
 * @return
 */
@PostMapping("/add")
public R<ShoppingCart> add(@RequestBody ShoppingCart shoppingCart){
    log.info("购物车数据：{}", shoppingCart);

    // 设置用户id
    Long currentId = BaseContext.getCurrentId();
    shoppingCart.setUserId(currentId);

    // 查询当前菜品或者套餐是否在购物车中
    Long dishId = shoppingCart.getDishId();


    LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
    queryWrapper.eq(ShoppingCart::getUserId, currentId);

    if (dishId != null){
        // 存在是菜品
        queryWrapper.eq(ShoppingCart::getDishId, dishId);
    }else {
        // 不存在是套餐
        queryWrapper.eq(ShoppingCart::getSetmealId, shoppingCart.getSetmealId());
    }

    ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);

    if (cartServiceOne != null){
        // 存在，则原数量+1
        Integer number = cartServiceOne.getNumber();
        cartServiceOne.setNumber(number + 1);
        shoppingCartService.updateById(cartServiceOne);
    }else {
        // 不存在，则添加数据
        shoppingCart.setNumber(1);
        shoppingCart.setCreateTime(LocalDateTime.now());
        shoppingCartService.save(shoppingCart);
        cartServiceOne = shoppingCart;
    }
    return R.success(cartServiceOne);
}

/**
 * 根据用户id查询购物车
 * @return
 */
@GetMapping("/list")
public R<List<ShoppingCart>> list(){
    // 用户id
    Long currentId = BaseContext.getCurrentId();
    LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
    queryWrapper.eq(ShoppingCart::getUserId, currentId);
    queryWrapper.orderByAsc(ShoppingCart::getCreateTime);
    List<ShoppingCart> list = shoppingCartService.list(queryWrapper);
    return R.success(list);
}

/**
 * 购物车更新
 * @param shoppingCart
 * @return
 */
@PostMapping("/sub")
public R<String> sub(@RequestBody ShoppingCart shoppingCart){
    Long currentId = BaseContext.getCurrentId();
    // 查询当前菜品或者套餐是否在购物车中
    Long dishId = shoppingCart.getDishId();


    LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
    queryWrapper.eq(ShoppingCart::getUserId, currentId);
    if (dishId != null){
        // 存在是菜品
        queryWrapper.eq(ShoppingCart::getDishId, dishId);
    }else {
        // 不存在是套餐
        queryWrapper.eq(ShoppingCart::getSetmealId, shoppingCart.getSetmealId());
    }
    ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);

    Integer number = cartServiceOne.getNumber();

    // 判断数量是否为1
    if (number == 1){
        // 删除
        shoppingCartService.remove(queryWrapper);
    }else {
        // 减少
        cartServiceOne.setNumber(number - 1);
        shoppingCartService.updateById(cartServiceOne);
    }
    return R.success("更新成功");
}

/**
 * 清空购物车
 * @return
 */
@DeleteMapping("/clean")
public R<String> clean(){
    Long currentId = BaseContext.getCurrentId();
    LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
    queryWrapper.eq(ShoppingCart::getUserId, currentId);
    shoppingCartService.remove(queryWrapper);
    return R.success("清空购物车成功");
}