Delete, Update

 

1. Delete 

- detail.mustache

<a href="/news/{{newsId}}/delete" class="btn btn-danger">Delete</a>

 

- NewsController.class

    @GetMapping("/{newsId}/delete")
    public  String deleteNews(@PathVariable("newsId") Long newsId){
        newsRepository.deleteById(newsId);
        return "redirect:/news/list";
    }

 

 

2. Edit

 

2-1. id로 데이터를 form에 가져오기

- detail.mustache

<a href="/news/{{newsId}}/edit" class="btn btn-secondary">Edit</a>

 

- NewsController.class

    @GetMapping("/{newsId}/edit")
    public String editNewsForm(@PathVariable("newsId") Long newsId, Model model) {
        News news = newsRepository.findById(newsId)
                .orElseThrow(() -> new IllegalArgumentException("해당 뉴스가 존재하지 않습니다."));
        model.addAttribute("news", news);
        return "news/edit";
    }

 

- edit.mustache 생성

• <input type="hidden" name="newsId" value="{{newsId}}">로 Id를 다시 가져오기

{{>layouts/header}}
{{#news}}
    <form class="container" action="/news/{{newsId}}/update" method="post">
        <input type="hidden" name="newsId" value="{{newsId}}">
        <div class ="mb-3">
            <label class="form-label">Title</label>
            <input type="text" class="form-control" name="title" value="{{title}}">
        </div>
        <div class ="mb-3">
            <label class="form-label">Content</label>
            <textarea class="form-control" name="content" rows="5">{{content}}</textarea>
        </div>
        <button type="submit" class="btn btn-primary">Submit</button>
        <a href="/news/{{newsId}}" class="btn btn-danger">Cancel</a>
    </form>
{{/news}}
{{>layouts/footer}}

 

2-2. dto 생성

- NewsDto.class에 Patch 추가

package com.example.news.dto;

import lombok.*;
public class NewsDto {
    @Getter
    @Setter
    @ToString // 주소가 아닌 NewsDto.Post(title=Title, content=속보입니다.)로 보이게 하는 것
    @NoArgsConstructor
    @AllArgsConstructor
    public static class Post{
        private String title;
        private String content;
    }

    @Getter
    @Setter
    @AllArgsConstructor
    @NoArgsConstructor
    public static class Patch {
        private String title;
        private String content;
    }
}

 

- NewsController.class

    @PostMapping("/{newsId}/update")
    public String editNews(@PathVariable("newsId") Long newsId, NewsDto.Patch patch) {
        News news = newsRepository.findById(newsId)
                .orElseThrow(() -> new IllegalArgumentException("해당 뉴스가 존재하지 않습니다."));
        news.setTitle(patch.getTitle());
        news.setContent(patch.getContent());
        newsRepository.save(news);
        return "redirect:/news/" + news.getNewsId();
    }

 

- mapper가 있다면?

- NewsMapper.interface 수정

PatchDtoToNews 추가 > Dto를 News객체로 변환

 

package com.example.news.mapper;

import com.example.news.domain.News;
import com.example.news.dto.NewsDto;
import org.mapstruct.Mapper;
import org.mapstruct.Mapping;
import org.mapstruct.MappingTarget;
import org.mapstruct.NullValuePropertyMappingStrategy;

import javax.sound.midi.Patch;

@Mapper(componentModel = "spring", nullValuePropertyMappingStrategy = NullValuePropertyMappingStrategy.IGNORE)
public interface NewsMapper{
    @Mapping(target = "newsId",ignore = true)
    News newsPostDtoToNews(NewsDto.Post post);

    @Mapping(target = "newsId", ignore = true)
    void PatchDtoToNews(NewsDto.Patch patch, @MappingTarget News news);

    //@Override
    //public void PatchDtoToNews(Patch patch, News news) {
    //    if ( patch == null ) {
    //        return;
    //    }
    //    if ( patch.getTitle() != null ) {
    //        news.setTitle( patch.getTitle() );
    //    }
    //    if ( patch.getContent() != null ) {
    //        news.setContent( patch.getContent() );
    //    }
    //}
}

 

- NewsController.class

@PostMapping("/{newsId}/update")
public String editNews(@PathVariable("newsId") Long newsId, NewsDto.Patch patch) {
    News news = newsRepository.findById(newsId)
            .orElseThrow(() -> new IllegalArgumentException("해당 뉴스가 존재하지 않습니다."));
    mapper.PatchDtoToNews(patch, news);
    newsRepository.save(news);
    return "redirect:/news/" + news.getNewsId();
}