Przesyłanie formularza Spring MVC z polem powiązanym z inną encją

Question

Dzień dobry.

Mam problem z przesłaniem formularza Spring MVC do bazy danych poprzez Hibernate. Pole productType w mojej encji "Product" jest kluczem obcym z encji "ProductType". Podczas przesyłania formularza wyskakuje mi błąd HTTP Status 400 - Bad Request. Jest to spowodane tym, że pole to nie jest typem prostym. Nie mam pomysłu jak w pliku jsp dodać to pole formularza, aby przesyłać cały formularz jednym przyciskiem submit.

Controller(chodzi o metodę saveProduct):

package pl.mibdbz.diabetes.controller;

import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import pl.mibdbz.diabetes.entity.Product;
import pl.mibdbz.diabetes.entity.ProductType;
import pl.mibdbz.diabetes.service.ProductService;

@Controller
@RequestMapping("/product")
public class ProductController {
    
    @Autowired
    private ProductService productService;
    
    @GetMapping("/list")
    public String listProducts(Model theModel) {
        
        List<Product> theProducts = productService.getProducts();
        
        theModel.addAttribute("products", theProducts);
        
        System.out.println(theProducts);
        
        return "list-products";
    }
    
    
    @RequestMapping("/showFormForAdd")
    public String showFormForAdd(Model theModel) {
        
        Product theProduct = new Product();
        
        theModel.addAttribute("product", theProduct);
        
        return "product-form";
    }
    
    @PostMapping("/saveProduct")
    public String saveProduct(@ModelAttribute("product") Product theProduct) {

        productService.saveProduct(theProduct);
        
        return "redirect:/product/list";
    }
 
}

Encja Product:

package pl.mibdbz.diabetes.entity;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToOne;
import javax.persistence.Table;

@Entity
@Table(name = "product")
public class Product {
    
    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(name="id")
    private int id;
    
    @Column(name="name")
    private String name;
    
    @Column(name="kcal")
    private int kcal;
    
    @Column(name="carbohydrates")
    private float carbohydrates;
    
    @Column(name="protein")
    private float protein;
    
    @Column(name="fat")
    private float fat;
    
    @OneToOne(cascade={CascadeType.DETACH, CascadeType.MERGE, CascadeType.PERSIST, CascadeType.REFRESH})
    @JoinColumn(name="product_type_id")
    private ProductType productType;
    
    
    
    
    public Product() {
        
    }

    public Product(String name, int kcal, float carbohydrates, float protein, float fat) {
        this.name = name;
        this.kcal = kcal;
        this.carbohydrates = carbohydrates;
        this.protein = protein;
        this.fat = fat;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getKcal() {
        return kcal;
    }

    public void setKcal(int kcal) {
        this.kcal = kcal;
    }

    public float getCarbohydrates() {
        return carbohydrates;
    }

    public void setCarbohydrates(float carbohydrates) {
        this.carbohydrates = carbohydrates;
    }

    public float getProtein() {
        return protein;
    }

    public void setProtein(float protein) {
        this.protein = protein;
    }

    public float getFat() {
        return fat;
    }

    public void setFat(float fat) {
        this.fat = fat;
    }

    public ProductType getProductType() {
        return productType;
    }

    public void setProductType(ProductType productType) {
        this.productType = productType;
    }

    @Override
    public String toString() {
        return "Product{" + "id=" + id + ", name=" + name + ", kcal=" + kcal + ", carbohydrates=" + carbohydrates + ", protein=" + protein + ", fat=" + fat + ", productType=" + productType + '}';
    }
    
}

Encja PorductType:

package pl.mibdbz.diabetes.entity;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name="product_type")
public class ProductType {
    
    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(name="id")
    private int id;
    
    @Column(name="name")
    private String name;
    
    @Column(name="short_name")
    private String shortName;
    
    public ProductType() {
        
    }

    public ProductType(String name, String shortName) {
        this.name = name;
        this.shortName = shortName;
    }
    

    
    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getShortName() {
        return shortName;
    }

    public void setShortName(String shortName) {
        this.shortName = shortName;
    }

    @Override
    public String toString() {
        return "ProductType{" + "id=" + id + ", name=" + name + ", shortName=" + shortName + '}';
    }
    
    
}

<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%
    response.setCharacterEncoding("UTF-8");
    request.setCharacterEncoding("UTF-8");
%>

<!DOCTYPE html>
<html lang="pl-PL">
    <head>
        
        <meta charset="UTF-8">
        
        <title>Dodawanie Produktu</title>
        
        <link type="text/css"
              rel="stylesheet"
              href="${pageContext.request.contextPath}/resources/css/style.css" />
        
        <link type="text/css"
              rel="stylesheet"
              href="${pageContext.request.contextPath}/resources/css/add-customer-style.css" />
        
    </head>
    
    <body>
        <div id="wrapper">
            <div id="header">
                <h2>DIABETES - Przelicznik Wymienników</h2>
            </div>
        </div>
        
        <div id="container">
            <h3>Zapisz Produkt</h3>
            
            <form:form action="saveProduct" modelAttribute="product" method="POST">
                <table>
                    <tbody>
                        <tr>
                            <td><label>Nazwa:</label></td>
                            <td><form:input path="name" /></td>
                        </tr>
                        
                        <tr>
                            <td><label>Kcal:</label></td>
                            <td><form:input path="kcal" /></td>
                        </tr>
                        
                        <tr>
                            <td><label>Węglowodany:</label></td>
                            <td><form:input path="carbohydrates" /></td>
                        </tr>
                        
                        <tr>
                            <td><label>Białka:</label></td>
                            <td><form:input path="protein" /></td>
                        </tr>
                        
                        <tr>
                            <td><label>Tłuszcze:</label></td>
                            <td><form:input path="fat" /></td>
                        </tr>
                        
                        <tr>
                            <td><label>Typ Produktu:</label></td>
                            <td><form:input path="productType" /></td>
                        </tr>
                        
                        <tr>
                            <td><label></label></td>
                            <td><input type="submit" value="Zapisz" class="save" /></td>
                        </tr>
                        
                    </tbody>
                </table>
                
            </form:form>
            
            <div style="clear: both;"></div>
            
            <p>
                <a href="${pageContext.request.contextPath}/product/list">Powrót do Listy</a>
            </p>
            
        </div>
    </body>
</html>

Link do githuba: link

Answer 1

Nie pamiętam dokładnie ale w formularzu robi się coś na zasadzie:

<td><form:input path="product.productType.name" /></td>

 

Comments

Twoja pamięć na pewno nie zawodzi. Działa! Wystarczyło samo productType.name. Bardzo dziękuję za pomoc. Zamykam