新增菜品----保存

由于菜品保存后向服务端发送请求，传递的参数既有dish类属性，也有dishflavor类属性

封装一个类DishDao，用于封装页面提交的数据(DTO，全称为Data Transfer Object，即数据传输对象，一般用于展示层与服务层之间的数据传输)

package com.itheima.dto;

import com.itheima.entity.Dish;
import com.itheima.entity.DishFlavor;
import lombok.Data;
import java.util.ArrayList;
import java.util.List;

@Data
public class DishDto extends Dish {

    private List<DishFlavor> flavors = new ArrayList<>();

    private String categoryName;

    private Integer copies;
}

由于要对两张表dish和dish_flavor进行操作，因此在DishService中重新定义一个方法。

package com.itheima.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.dto.DishDto;
import com.itheima.entity.Dish;
import com.itheima.entity.DishFlavor;
import com.itheima.mapper.DishMapper;
import com.itheima.service.DishFlavorService;
import com.itheima.service.DishService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

@Service
public class DishServiceImpl extends ServiceImpl<DishMapper, Dish> implements DishService {

    @Autowired
    private DishFlavorService dishFlavorService;
    /**
     * 新增菜品同时保存对应的口味数据
     * @param dishDto
     */
    @Override
    @Transactional
    public void saveWithFlavor(DishDto dishDto) {
        //保存菜品的基本信息到dish表
        this.save(dishDto);
        //菜品保存后就生成id了
        Long dishId = dishDto.getId();
        //菜品口味
        List<DishFlavor> flavors = dishDto.getFlavors();
        flavors = flavors.stream().map((item) -> {
            item.setDishId(dishId);
            return item;
        }).collect(Collectors.toList());
//        for(int i=0; i<flavors.size(); i++){
//            list().get(i).setId(dishId);
//        }
        
        //保存菜品口味数据到dish_flavor表
        dishFlavorService.saveBatch(flavors);
        
        
        
    }
}

开启事务管理，@Transactional。并在启动类上开启支持事务管理。

package com.itheima;

import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.transaction.annotation.EnableTransactionManagement;

@Slf4j
@SpringBootApplication
@ServletComponentScan
@EnableTransactionManagement
public class ReggieTakeOutApplication {

    public static void main(String[] args) {

        SpringApplication.run(ReggieTakeOutApplication.class, args);
        log.info("项目启动成功");
    }

}

在DishController中保存

package com.itheima.controller;

import com.itheima.common.R;
import com.itheima.dto.DishDto;
import com.itheima.entity.Dish;
import com.itheima.service.DishFlavorService;
import com.itheima.service.DishService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

/**
 * 菜品管理
 */
@RestController
@RequestMapping("/dish")
@Slf4j
public class DishController {
    @Autowired
    private DishService dishService;
    @Autowired
    private DishFlavorService dishFlavorService;


    /**
     * 将菜品和菜品风味保存到对应的表里面(新增)
     * @return
     */
    @PostMapping
    public R<String> save(@RequestBody DishDto dishDto){
        dishService.saveWithFlavor(dishDto);
//        log.info(dishDto.toString());
        return R.success("新增菜品成功");
    }




}