質問編集履歴
2
全ファイル更新
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@@ -23,6 +23,7 @@
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import java.time.LocalDateTime;
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import java.util.List;
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import javax.persistence.CascadeType;
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import javax.persistence.Column;
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import javax.persistence.Entity;
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import javax.persistence.GeneratedValue;
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@@ -45,9 +46,15 @@
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@Column(length=1000) //テーブルの列を制御したい場合は@Columnをつける。フィールドの長さをデフォルトの255から1000にする。
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private String contents;
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@OneToMany(mappedBy="blog") //mappedBy引数には「相手側が自分を参照する名前」を指定。
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@OneToMany(mappedBy = "blog", cascade = CascadeType.ALL) //mappedBy引数には「相手側が自分を参照する名前」を指定。
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private List<Comment> comments;
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public void addComment(Comment comment) {
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comment.setBlog(this);
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comments.add(comment);
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}
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}
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```
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@@ -79,6 +86,10 @@
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}
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}
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```
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BlogRepository.java
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```
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@@ -110,8 +121,11 @@
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import java.util.List;
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import java.util.Optional;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.stereotype.Controller;
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import org.springframework.transaction.annotation.Transactional;
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import org.springframework.ui.Model;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.PathVariable;
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Comment comment = new Comment();
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comment.setBlog(blog.get());
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model.addAttribute("comment", comment);
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return "blog";
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return "/blog";
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}
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@Transactional
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@PostMapping("/comment")
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@PostMapping("/blog/{blogId}/comment")
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public String createComment(Comment comment) {
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public String createComment(@PathVariable("blogId") Integer id, Comment comment) {
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comment.setPostDateTime(LocalDateTime.now());
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Optional<Blog> optionalBlog = blogRepository.findById(id);
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Blog blog = optionalBlog.orElseThrow(RuntimeException::new);
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blog.addComment(comment);
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blogRepository.save(blog);
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return "redirect:/blog/" +
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return "redirect:/blog/" + id;
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}
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}
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```
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blog.html
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```
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@@ -193,7 +226,7 @@
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</th:block>
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</p>
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<form action="/comment" method="post" th:object="${comment}">
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<form th:action="@{/blog/{blogId}/comment(blogId=${blog.id})}" method="post" th:object="${comment}">
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コメントをどうぞ<br>
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<input type="hidden" name="blog" th:value="*{blog.id}">
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<input type="text" size="40" th:field="*{text}">
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</body>
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</html>
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```
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エラー内容
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```
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@@ -248,7 +282,7 @@
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</body>
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</html>
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```
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form.html
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form.html
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```
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<!DOCTYPE html>
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<html xmlns:th="http://www.thymeleaf.org">
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1
DB。blogテーブルとcommentテーブルの構造の追加。
title
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File without changes
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body
CHANGED
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@@ -222,4 +222,59 @@
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Validation failed for object='comment'. Error count: 1
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org.springframework.validation.BindException: org.springframework.validation.BeanPropertyBindingResult: 1 errors
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Field error in object 'comment' on field 'blog': rejected value [4]; codes [typeMismatch.comment.blog,typeMismatch.blog,typeMismatch.com.example.demo.Blog,typeMismatch]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [comment.blog,blog]; arguments []; default message [blog]]; default message [Failed to convert property value of type 'java.lang.String' to required type 'com.example.demo.Blog' for property 'blog'; nested exception is java.lang.IllegalStateException: Cannot convert value of type 'java.lang.String' to required type 'com.example.demo.Blog' for property 'blog': no matching editors or conversion strategy found]
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```
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```
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index.html（トプページ。配列でblogタイトルと日時を出し、aタグでidのページに行きます）
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```
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<!DOCTYPE html>
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<html xmlns:th="http://www.thymeleaf.org/">
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<head>
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<meta charset="UTF-8">
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<title>Insert title here</title>
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</head>
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<body>
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<p>
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<a href="/form">新規作成</a>
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</p>
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<ul>
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<li th:each="blog : ${blogs}" th:object="${blog}">
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<a th:href="@{|/blog/*{id}|}" th:text="*{title}">タイトル</a>
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<span th:text="*{postDateTime}">投稿日時</span>
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</li>
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</ul>
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</body>
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</html>
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```
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form.html（blog投稿。blogの投稿は問題なくできていました）
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```
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<!DOCTYPE html>
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<html xmlns:th="http://www.thymeleaf.org">
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<head>
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<meta charset="UTF-8">
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<title>新規ブログ</title>
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</head>
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<body>
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<form action="/create" method="post" th:object="${blog}">
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<div>
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タイトル<br>
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<input type="text" size="40" th:field="*{title}">
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</div>
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<div>
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内容<br>
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<textarea rows="5" cols="60" th:field="*{contents}"></textarea>
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</div>
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<div>
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<input type="submit">
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</div>
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</form>
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</body>
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</html>
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```
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送信するとエラー
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