Problem with passing changed subobject in SPRING application via Thymeleaf template - spring

I am new in SPING and web developing.
I am developing the test task - quote book (without authorizing). I have two entities: Quote and Author. There is the code:
#Entity
#Table(name="authors")
public class Author {
#Id
#SequenceGenerator(name="author_id_seq", sequenceName="author_id_seq", allocationSize=1)
#GeneratedValue(strategy = GenerationType.SEQUENCE,generator = "author_id_seq")
#Column(name = "id")
private long id;
#Column(name = "nick_name")
private String nickName;
public Author() {
}
public Author(long id, String nickName) {
this.id = id;
nickName = nickName;
}
/*
Getters and Setters
*/
}
Quote:
#Entity
#Table(name = "quotes")
public class Quote {
#Id
#GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "quotes_id_seq")
#SequenceGenerator(name="quotes_id_seq", sequenceName="quotes_id_seq", allocationSize=1)
#Column(name = "id")
private long id;
#Column(name = "content")
private String content;
// #Temporal(TemporalType.DATE)
#Column(name = "date")
private LocalDate date;
#ManyToOne
#JoinColumn(name = "author")
private Author author;
public Quote() {
}
public Quote(long id, String content, LocalDate date, Author author) {
this.id = id;
this.content = content;
this.date = date;
this.author = author;
}
/*
Getters and Setters
*/
}
My Thymeleaf template contains form with two input fields(for quote.content and for quote.author.nickName) and select with existing authors. I want to see the behavior, when i fill input for author, content and if author is not existing in authors table, my application add the row in this table with specified by value from input nickName and generated id. But the problem is in getting unexpected result for me from Thymeleaf template. Template pass to controller the Quote object with author, which nickname is null instead of value from my input. There is thymeleaf template code of my form:
<form action="#" th:action="#{/newQuote}" th:object="${quote}" method="post">
<div class="form-row">
<div class="form-group col-md-3">
<label class="sr-only" for="inputNick">Nick Name</label>
<!--/*#thymesVar id="author" type="hello.entity.Author"*/-->
<input type="text" class="form-control" id="inputNick" th:field="*{author.nickName}"
placeholder="enter Nick Name">
</div>
<div class="form-group col-md-6">
<select id="nickNames">
<th:block th:each="author : ${allAuthors}">
<option th:text="${author.nickName}">Nick Name</option>
</th:block>
</select>
</div>
<div class="form-group col-md-12">
<label for="postContent">Your Quote:</label>
<input type="text" class="form-control" id="postContent" th:field="*{content}"
placeholder="quote text">
</div>
</div>
<div class="form-group col-md-2">
<input type="submit" value="Add Quote"/>
</div>
<div class="form-group col-md-2">
<input type="reset" value="Reset"/>
</div>
</form>
Controller methods:
#GetMapping("/newQuote")
public String showAuthors(Model model){
model.addAttribute("allAuthors",authorService.findAll());
model.addAttribute("quote", new Quote());
return "newQuote";
}
#PostMapping("/newQuote")
public String addQuote (#ModelAttribute Quote quote) {
quote.setDate(LocalDate.now());
quoteRepository.save(quote);
return "redirect:/";
I've tried:
to add Author object in GetMapping, pass it in newQuote template,
pass from it to PostMapping - no effect. Null in nickname.
to create and insert author object in quote object, pass to
template, pass to postmapping. no effect
I know that i can create DTO class with field nickname insteadof author field and convert it into my entity class in postmapping method of controller. But i think that it is "bad practice" way. I think, that i made wrong steps,may be, when tried to change author object and pass it from thymeleaf to controller. And also i suppose, that there is no way to realize this logic in this situation. i dont know where is the truth. Please, help me in finding it.
P.S: sorry for my bad english

So, the answer is asking how to add a quote and it's author at the same time. With a select approach is impossible, since our author doesn't exists. And simple way to achieve this, is changing your quote entity and adding #Cascade(CascadeType.PERSIST) to the author field in quote. This will automatically persist the author with your quote.
These would be the changes to your code that you would required to accomplish this.
Update
Since, the last solution didn't work, we will try sending an additional parameter to our controller, to avoid receiving a null, instead of the author's nickname.
Controller
#PostMapping("/newQuote")
public String addQuote (#ModelAttribute Quote quote,
#RequestParam("nickName") String nickName) {
// This will automatically persist your quote and it's author.
quote.setDate(LocalDate.now());
Author author = new Author();
author.setNickName(nickName);
quoteRepository.save(quote);
}
Quote Entity
#Entity
#Table(name = "quotes")
public class Quote {
#Id
#GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "quotes_id_seq")
#SequenceGenerator(name="quotes_id_seq", sequenceName="quotes_id_seq", allocationSize=1)
#Column(name = "id")
private long id;
#Column(name = "content")
private String content;
#Column(name = "date")
private LocalDate date;
#ManyToOne
#Cascade(CascadeType.PERSIST)
#JoinColumn(name = "author")
private Author author;
// Getters and Setters
}
Important, make sure to notice that we are adding a new annotation #Cascade(CascadeType.PERSIST) to our author field.
HTML
Here we will simply remove the unnecessary select.
<form action="#" th:action="#{/newQuote}" th:object="${quote}" method="post">
<div class="form-row">
<div class="form-group col-md-3">
<label class="sr-only" for="inputNick">Nick Name</label>
<!--/*#thymesVar id="author" type="hello.entity.Author"*/-->
<input type="text" name="nickName" class="form-control" id="inputNick" placeholder="enter Nick Name"/>
</div>
<div class="form-group col-md-12">
<label for="postContent">Your Quote:</label>
<input type="text" class="form-control" id="postContent" th:field="*{content}" placeholder="quote text"/>
</div>
</div>
<div class="form-group col-md-2">
<input type="submit" value="Add Quote"/>
</div>
<div class="form-group col-md-2">
<input type="reset" value="Reset"/>
</div>
</form>

Related

Missing values between GET and POST method

I'm learning Spring Boot and I have a problem. I'm creating an Order in one form and then adding the user's details in the second. The second form's GET method has the parameter NewOrder and it's received well (checked using a debugger). Then in this form I'm creating OrderDetails, in which is saved NewOrder and some Strings. Then I'm passing it to the repository using POST method, but in created OrderDetails, there're only Strings and NewOrder is null. How could I resolve it?
First POST method (from the first controller):
#PostMapping
public String processOrder( #ModelAttribute NewOrder order, final RedirectAttributes redirectAttributes) {
redirectAttributes.addFlashAttribute("order", order);
ordersProxy.addOrder(order);
return "redirect:/sendOrder";
}
Second controller (POST and GET):
#GetMapping
public String showSendOrderForm(Model model, #ModelAttribute("order") NewOrder order) {
model.addAttribute("details", new OrderDetails(order) );
model.addAttribute("companies", companyProxy.getCompanies());
return "orderDetails";
}
#PostMapping
public String processTaco( OrderDetails details) {
detailsProxy.addOrderDetails(details);
return "orderDetails";
}
And here, the OrderDetails details in Post Order is null.
orderDetails.html
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:th="http://www.thymeleaf.org">
<head>
<title>Taco Cloud</title>
<link rel="stylesheet" th:href="#{/styles.css}" />
</head>
<body>
<form method="POST" th:object="${details}">
<a th:href="#{/design}" id="another">Order</a><br/>
<h3>Deliver to...</h3>
<label for="name">Name: </label>
<input type="text" th:field="*{name}"/>
<br/>
<label for="surname">Surname: </label>
<input type="text" th:field="*{surname}"/>
<br/>
<label for="room">Room: </label>
<input type="text" th:field="*{room}"/>
<br/>
<br/>
<h2>Please, choose your company:</h2>
<select th:field="*{company}">
<option th:each="i : ${companies}" th:value="${i.id}" th:text="${i.name}">
</option>
</select>
</div>
</div>
<input type="submit" value="Submit Order"/>
</form>
</body>
</html>
OderDetails class:
#Data
#Entity
#RequiredArgsConstructor
#NoArgsConstructor(access=AccessLevel.PRIVATE, force=true)
public class OrderDetails {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Integer id;
private String name;
private String surname;
private String room;
#OneToOne
private final NewOrder order;
#ManyToOne
private Company company;
}
I have also tried to pass NewOrder directly to POSTmethod and there add order to details, but it was still null.
Adding #RequestBody should work for null OrderDetails. Check out this for more about it: https://www.baeldung.com/spring-request-response-body
#PostMapping
public String processTaco(#RequestBody OrderDetails details) {
detailsProxy.addOrderDetails(details);
return "orderDetails";
}

Show Springboot validation results in Thymeleaf template

I am getting started with Springboot and am unable to propagate validation results (errors) back to the thyme template. I have a typical setup: #Entity object, #Service, and #Repository. Here are the sections of my Controller and index template (and its form). UserVital, UserBlood, etc. are the data objects mapped to the DB tables using hibernate. Hope this information is enough for the members to point me in the right direction.
Data Object
#Entity
#Table(name = ".....")
public class UserVital {
#NotNull(message = "Height (Feet) cannot be null")
#Range(min = 0, max = 15, message = "Height (Feet) must be greater than 0")
#Column(name = "feet", nullable = false)
private int heightInFeet;
.............
}
Controller
#GetMapping("/")
public String getUsers(Model model) {
UserVital vital = new UserVital();
UserGrithMeasurements grith = new UserGrithMeasurements();
UserBloodChemistry blood = new UserBloodChemistry();
List<Category> categories = categoryService.getAllCategories();
model.addAttribute("categories", categories.get(0));
model.addAttribute("vital", vital);
model.addAttribute("grith", grith);
model.addAttribute("blood", blood);
return "index";
}
#PostMapping("/add")
public String addData(#Valid UserVital vital, BindingResult vitalValidationResult,
#Valid UserGrithMeasurements grith, BindingResult grithValidationResult, #Valid UserBloodChemistry blood,
BindingResult bloodValidationResult, Model model) {
if (vitalValidationResult.hasErrors() || grithValidationResult.hasErrors()
|| bloodValidationResult.hasErrors()) {
return "index";
} else {
model.addAttribute("successMsg", "Details saved successfully!!");
return "index";
}
}
Thyme Form
<form class="tab-content" method="POST" th:action="#{/add}">
<div class="form-group row">
<label for="height" class="col-sm-2 control-label" th:text="#{height}"></label>
<div class="col-sm-2">
<input type="number" class="form-control" id="feet" th:attr="placeholder=#{feet}"
th:field="${vital.heightInFeet}">
</div>
<div class="form-group col-sm-12">
<label for="neck" class="col-sm-2 control-label" th:text="#{neck}"></label>
<div class="col-sm-2">
<input type="number" class="form-control" id="systolic" th:attr="placeholder=#{inches}"
th:field="${grith.neck}">
<div class="col-sm-2">
<input type="number" class="form-control" id="ldl" th:field="${blood.ldl}">
.....
</form>
Question: As you can see I have multiple BindingResult objects. Each BindingResult object holding the validation results of the respective data object (vitalValidationResult holds validation result of UserVital object vital, etc.). Now, how do I write "th:if" statements in the template that will allow me to check if there are any errors in the fields.
Thanks.
I have solved the problem by encapsulating the required form fields in a div and then placing "th:object=${objectName}" in the div.
<form >
<div class="tab-pane active text-center" id="tab_1_1" th:object=${vital}>
<div class="tab-pane active text-center" id="tab_1_2" th:object=${grith}>
</form>

Unable to fetch UI due to bean validation error getting BindingException

I am getting below error when I am hitting '/signup' API after '/index' API. I have gone through many links. I found mentioned in various resources that the issue is the order of #Valid and BindingResult param needs to be maintained and I see it already in my code still I am unable to find what exactly the problem is. Please help me resolve this issue:
2021-05-31 19:37:40.721 WARN 10224 --- [nio-8080-exec-2] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved [org.springframework.validation.BindException: org.springframework.validation.BeanPropertyBindingResult: 5 errors
Field error in object 'journeyFoodOrder' on field 'contactNoOfGuide': rejected value [null]; codes [NotNull.journeyFoodOrder.contactNoOfGuide,NotNull.contactNoOfGuide,NotNull.java.lang.String,NotNull]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [journeyFoodOrder.contactNoOfGuide,contactNoOfGuide]; arguments []; default message [contactNoOfGuide]]; default message [Mobile No Of Guide is mandatory]
Field error in object 'journeyFoodOrder' on field 'nameOfCenter': rejected value [null]; codes [NotBlank.journeyFoodOrder.nameOfCenter,NotBlank.nameOfCenter,NotBlank.java.lang.String,NotBlank]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [journeyFoodOrder.nameOfCenter,nameOfCenter]; arguments []; default message [nameOfCenter]]; default message [Name Of Center is mandatory]
Field error in object 'journeyFoodOrder' on field 'mealRetrievalTime': rejected value [null]; codes [NotNull.journeyFoodOrder.mealRetrievalTime,NotNull.mealRetrievalTime,NotNull.java.util.Date,NotNull]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [journeyFoodOrder.mealRetrievalTime,mealRetrievalTime]; arguments []; default message [mealRetrievalTime]]; default message [Meal retrieval time is mandatory]
Field error in object 'journeyFoodOrder' on field 'nameOfGuide': rejected value [null]; codes [NotBlank.journeyFoodOrder.nameOfGuide,NotBlank.nameOfGuide,NotBlank.java.lang.String,NotBlank]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [journeyFoodOrder.nameOfGuide,nameOfGuide]; arguments []; default message [nameOfGuide]]; default message [Name Of Guide is mandatory]
Field error in object 'journeyFoodOrder' on field 'dateOfDeparture': rejected value [null]; codes [NotNull.journeyFoodOrder.dateOfDeparture,NotNull.dateOfDeparture,NotNull.java.util.Date,NotNull]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [journeyFoodOrder.dateOfDeparture,dateOfDeparture]; arguments []; default message [dateOfDeparture]]; default message [Departure date is mandatory]]
Controller Code
#Controller
public class JourneyFoodOrderController {
private final JourneyFoodOrderRepository journeyFoodOrderRepository;
#Autowired
public JourneyFoodOrderController(JourneyFoodOrderRepository journeyFoodOrderRepository) {
// TODO Auto-generated constructor stub
this.journeyFoodOrderRepository = journeyFoodOrderRepository;
}
#GetMapping("/signup")
public String showSignUpForm(#Valid JourneyFoodOrder journeyFoodOrder) {
return "add-journeyFoodOrder";
}
#PostMapping("/addJourneyFoodOrder")
//#Valid AccountForm form, BindingResult result, (binding=false) Account account
public String addJourneyFoodOrder(#Valid JourneyFoodOrder journeyFoodOrder, BindingResult result, Model model) {
if (result.hasErrors()) {
return "add-journeyFoodOrder";
}
model.addAttribute("journeyFoodOrder", journeyFoodOrder);
journeyFoodOrderRepository.save(journeyFoodOrder);
return "redirect:/index";
}
#GetMapping("/index")
public String showJourneyFoodOrderList(Model model) {
model.addAttribute("journeyFoodOrders", journeyFoodOrderRepository.findAll());
return "index";
}
}
View Code
<body>
<div class="container">
<div class="row">
<div class="col-md-4 mt-5">
<div id="successMessage"class="alert alert-success" role="alert">
Order saved successfully
</div>
<div id="failureMessage" class="alert alert-danger" role="alert">
Invalid data
</div>
<form action="#" th:action="#{/addJourneyFoodOrder}" th:object="${journeyFoodOrder}"method="post">
<h2 class="mb-5">New Order</h2>
<div class="form-group">
<label for="nameOfCenter">Name of Center</label>
<input type="text" th:field="*{nameOfCenter}" class="form-control" placeholder="Name of Center">
<span th:if="${#fields.hasErrors('nameOfCenter')}" th:errors="*{nameOfCenter}"></span>
</div>
<div class="form-group">
<label for="nameOfGuide">Name of Guide/Teacher</label>
<input type="text" th:field="*{nameOfGuide}" class="form-control" placeholder="Name of Guide">
<span th:if="${#fields.hasErrors('nameOfGuide')}" th:errors="*{nameOfGuide}"></span>
</div>
<div class="form-group">
<label for="headCount">Head count</label>
<input type="number" th:field="*{headCount}" class="form-control" placeholder="Head count">
<span th:if="${#fields.hasErrors('headCount')}" th:errors="*{headCount}"></span>
<span th:if="${#fields.hasErrors('name')}" th:errors="*{name}"></span>
</div>
<div class="form-group">
<label for="dateOfJourney">Mobile No Of Guide</label>
<input type="text" th:field="*{contactNoOfGuide}" class="form-control" placeholder="Mobile No Of Guide">
<span th:if="${#fields.hasErrors('contactNoOfGuide')}" th:errors="*{contactNoOfGuide}"></span>
</div>
<div class="form-group">
<label for="dateOfDeparture">Date of departure</label>
<div class="input-group date" id="datetimepicker2" data-target-input="nearest">
<input type="text" class="form-control datetimepicker-input" data-target="#datetimepicker2" th:field="*{dateOfDeparture}" id="date" placeholder="Choose departure date"/>
<span th:if="${#fields.hasErrors('dateOfDeparture')}" th:errors="*{dateOfDeparture}"></span>
<div class="input-group-append" data-target="#datetimepicker2" data-toggle="datetimepicker">
<div class="input-group-text"><i class="fa fa-calendar-alt"></i></div>
</div>
</div>
</div>
<div class="form-group">
<label for="date">Meal retrieval time:</label>
<div class="input-group date" id="datetimepicker1" data-target-input="nearest">
<input type="text" class="form-control datetimepicker-input" data-target="#datetimepicker1" th:field="*{mealRetrievalTime}" id="date" placeholder="Choose meal retrieval date and time"/>
<span th:if="${#fields.hasErrors('mealRetrievalTime')}" th:errors="*{mealRetrievalTime}"></span>
<div class="input-group-append" data-target="#datetimepicker1" data-toggle="datetimepicker">
<div class="input-group-text"><i class="fa fa-calendar-alt"></i></div>
</div>
</div>
</div>
Model
#Entity
public class JourneyFoodOrder{
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private long id;
#NotBlank(message="Name Of Center is mandatory")
private String nameOfCenter;
#NotBlank(message="Name Of Guide is mandatory")
private String nameOfGuide;
#NotNull(message="Head Count is mandatory")
private int headCount;
#NotNull(message="Mobile No Of Guide is mandatory")
private String contactNoOfGuide;
#NotNull(message="Departure date is mandatory")
#DateTimeFormat(pattern = "dd/MM/yyyy")
private Date dateOfDeparture;
#NotNull(message="Meal retrieval time is mandatory")
#DateTimeFormat(pattern = "dd/MM/yyyy h:mm a")
private Date mealRetrievalTime;
#NotNull(message="Thepla Count is mandatory")
private int thepla;
#NotNull(message="Puri Count is mandatory")
private int puri;
#NotNull(message="Roti Count is mandatory")
private int roti;
#NotNull(message="Achar count is mandatory")
private int achar;
#NotNull(message="Jam count is mandatory")
private int jam;
#NotNull(message="Bread count is mandatory")
private int bread;
#NotNull(message="Other items count is mandatory")
private int others;
//..............setters and getters
}
The problem is that you have #Valid annotation on the #GetMapping method:
#GetMapping("/signup")
public String showSignUpForm(#Valid JourneyFoodOrder journeyFoodOrder) {
return "add-journeyFoodOrder";
}
This indicates that JourneyFoodOrder already should be valid when showing the form for the first time, which is never true. Use this in stead:
#GetMapping("/signup")
public String showSignUpForm(JourneyFoodOrder journeyFoodOrder) {
return "add-journeyFoodOrder";
}
I personally find it clearer to do this:
#GetMapping("/signup")
public String showSignUpForm(Model model) {
model.addAttribute("journeyFoodOrder", new JourneyFoodOrder());
return "add-journeyFoodOrder";
}
But both will work fine.
Additional notes:
You need to use #ModelAttribute for your form data object parameter in the #PostMapping method:
public String addJourneyFoodOrder(#Valid #ModelAttribute("journeyFoodOrder") JourneyFoodOrder journeyFoodOrder, BindingResult result, Model model) {
...
}
After fixing the #GetMapping method, you will run into another problem because add-journeyFoodOrder.html has this line that should be removed:
<span th:if="${#fields.hasErrors('name')}" th:errors="*{name}"></span>
You might want to use a dedicated form data object to bind to the HTML form instead of using your entity directly. See Form handling with Thymeleaf for more information on that.

Thymeleaf - Setting Object's Field To Another Object

I've been stuck on this issue for a while now. I am making an E-Commerce application and I have a product class and a CartItems class.
The CartItems class contains a product in it, because in a cart you will have products inside and the CartItems basically takes the product you select and gets details like total price and quantity.
CartItems:
#Table(name = "cartitems")
public class CartItems implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private int id;
#Column(name = "quantity")
private int quantity;
#Column(name = "price")
private double price;
#OneToOne
#JoinColumn(name = "product_id")
private Product product;
#ManyToOne
#JoinColumn(name = "cart_id")
private Cart cart;
public CartItems() {
}
public CartItems(Product product, int quantity, double price, Cart cart) {
this.quantity = quantity;
this.price = price;
this.product = product;
this.cart = cart;
}
Catalog Thymeleaf Page:
<div th:each="product : ${popularProducts}">
<form action="#" th:action="#{'/cart/'}" th:object="${cartItem}" method="POST">
<div class="card">
<img class="card-img" th:src="${product.pictureUrl}">
<a href="#" class="card-link text-danger like">
<i class="fas fa-heart"></i>
</a>
</div>
<div class="card-body">
<h4 class="card-title" th:text="${product.getName()}"></h4>
<h6 class="card-subtitle mb-2 text-muted" th:text="${product.getCategory()}"></h6>
<p class="card-text" th:text="${product.getDescription()}">
<div class="buy d-flex justify-content-between align-items-center">
<div class="price text-success"><h5 class="mt-4" th:text="'$' + ${product.getPrice()}"></h5></div>
<div class="form-group blu-margin">
<div class="form-label-group">
<input th:field="*{cartItem.quantity}" type="text" id="quantity" name="quantity" class="form-control" placeholder="1" required="required">
</div>
</div>
<i class="fas fa-shopping-cart"></i> Add to Cart
</div>
The problem is with setting the CartItems.product equal to the currently displayed product.
I am looping through each product, and if the user presses Add To Cart, I want the CartItem's product field to be equal to the currently displayed product. How do you manually set this when you pass it back up the controller?
Is there a way of just typing ${cartItem.product = product} without having the user to manually write it as an input?
Alternatively, is there a way I can feed up the product : ${popularProducts}
using model attribute? How do I bring that up once the form is submitted along with CartItem object?
I managed to fix this by putting the product id into the post mapping address as a path variable then using the product repository to find the product by the id passed through then setting it manually in the controller.

Pass a object from Select in Thyemleaf

I have the following class:
public class Person {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "person_id")
private int personId;
#Column(name = "person_name", unique = true)
private String personName;
#Column(name = "gender")
private Gender personGender;
}
Here is Gender as well:
public class Gender{
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "gender_id")
private int genderId;
#Column(name = "gender_name", unique = true)
private String genderName;
}
I've assembled a Thymelef dropdown menu when creating a new Person that looks like this:
#RequestMapping(value = ("/newPerson"), method = RequestMethod.GET)
public ModelAndView createPerson() {
ModelAndView model = new ModelAndView();
Person person= new Person ();
model.addObject("person", person);
List<Gender> genders= genderService.getAll();
model.addObject("genders", genders);
model.setViewName("user/newPerson");
return model;
}
(I realize it looks kinda dumb, but it is a simplified version of my code.)
And here is the HTML:
<form class="form-createNew" role="form" method="POST"
th:action="#{/newPerson}" th:object="${person}">
<div class="form-row">
<div class="col">
<div class="form-label-group">
<input type="text" th:field="*{personName}" id="personName" class="form-control" placeholder="Person name">
</div>
</div>
</div>
<div class="form-row">
<div class="col">
<div class="form-label-group">
<select th:field="*{personGender}" class="form-control"
id="personGender" name="personGender">
<option value="" selected disabled hidden>Select gender</option>
<option th:each="gender: ${genders}"
th:value="${gender.genderId}"
th:text="${gender.genderName}"></option>
</select>
</div>
</div>
</div>
<button id="registerBtn" class="btn btn-lg btn-primary btn-block shadow-none text-uppercase" type="submit"> Create </button>
</form>
And finally my question:
What I am receiving at the POST method in the controller for /newPerson is a Person object with the value from the input field, but NULL for the Gender. What is causing that and where am I wrong here? I went through similar questions on SO regarding that issue and also the Thymeleaf Docs/Baeldung and everything looks okay to me.
Any help is appreciated! :)
You are sending for your post controller something like this:
personGender: gernderId
You must do:
personGender.genderId : genderId
For that use in your html:
th:field="*{personGender.genderId}"
instead of
th:field="*{personGender}"
I think it will help you!

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