Argthtjtr

I want to save 2 x entity, author and book from a single form. How I can do this?

I know I must first save author, but I don't know how. Author is in a one-to-many relationship with book.

I have set cascadetype.ALL. I'm using thymeleaf.

<form th:object="${book}" th:action="@{/book/}" method="post">

    <input type="hidden" class="form-control" th:field="*{id}"/>

    <label>title</label>

    <input type="text" class="form-control" th:field="*{title}"/>

    <label>isbn</label>

    <input type="text" class="form-control" th:field="*{isbn}"/>

    <label>description</label>

    <input type="text" class="form-control" th:field="*{description}"/>

    <label>cat</label>

    <ul>

        <li th:each="category : ${book.getCategorySet()}" th:text="category.getCategory()"></li>

    </ul>

    <label>author</label>

    <input type="text" class="form-control" th:field="*{author.name}"/>



    <input type="submit" value="Submit" />

    <input type="reset" value="Reset" />

</form>

authorCommand

@Setter

@Getter

@NoArgsConstructor

public class AuthorCommand {

    private long id;

    private String name;

    private String lastName;

    private Set<BookCommand> bookCommandSet = new HashSet<>();

}

bookCommand

@Setter

@Getter

@NoArgsConstructor

public class BookCommand {

    private long id;

    private String title;

    private String isbn;

    private String description;

    private Set<CategoryCommand> categorySet = new HashSet<>();

    private AuthorCommand author;

}

bookController

@RequestMapping(value = "book/new", method = RequestMethod.GET)

public String newBook(Model model){

    model.addAttribute("book", new BookCommand());

    return "book/form";

}



@RequestMapping(value = "book", method = RequestMethod.POST)

public String saveOrUpdate(@ModelAttribute("book") BookCommand bookCommand){

    BookCommand savedBook = bookService.saveBookCommand(bookCommand);

    return "redirect:/book/show/"+savedBook.getId();

}

Well, you can always send additional parameters aside from your model, using the name tag in your inputs.

HTML

<form th:object="${book}" th:action="@{/book/}" method="post">

    <input type="hidden" class="form-control" th:field="*{id}"/>

    <label>title</label>

    <input type="text" class="form-control" th:field="*{title}"/>

    <label>isbn</label>

    <input type="text" class="form-control" th:field="*{isbn}"/>

    <label>description</label>

    <input type="text" class="form-control" th:field="*{description}"/>

    <label>cat</label>

    <ul>

        <li th:each="category : ${book.getCategorySet()}" th:text="category.getCategory()"></li>

    </ul>

    <label>author</label>

    <input type="text" class="form-control" name="author"/>

    <input type="submit" value="Submit" />

    <input type="reset" value="Reset" />

</form>

Controller

@RequestMapping(value = "book", method = RequestMethod.POST)

public String saveOrUpdate(@ModelAttribute("book") BookCommand bookCommand,

                           @RequestParam("author") String name,

                           BindingResult bindingResult){

    if( bindingResult.hasErrors()) {

        return "redirect:/book/new";

    }



    Author author = new Author();

    author.setName(name);

    authorService.saveAuthor(author);

    savedBook.setAuthor(author);

    BookCommand savedBook = bookService.saveBookCommand(bookCommand);

    return "redirect:/book/show/"+savedBook.getId();

}

A few things to considered, I don't know how you are separating the author name, but I would add two different inputs, one for the first name and another for the last name. Also, I am assuming the author's id is using @GeneratedValue.