Clash Royale CLAN TAG#URR8PPP

Why this Thymeleaf form binding with selection field does not work?

I have two models, Patient and Study. In the Study model, I want to use Patient's Id as a foreign key. My Study Model (without getter/setter) is as below

Patient

Study

Study

Patient

Study

@Entity
@Table(name = "Study")
public class Study

@Id
@Column(name = "study_id")
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;

@NotNull
@ManyToOne
@JoinColumn(name = "patient_id")
private Patient patient;

@NotNull
@Column(name = "description")
private String description;

@NotNull
@Column(name = "status")
private String status;



EDIT : Adding Patient class (without getter/setter) as well

@Entity
@Table(name="Patient")
public class Patient

@Id
@Column(name="patient_id")
@GeneratedValue(strategy=GenerationType.AUTO)
private Long id;

@NotNull
@Column(name="name")
private String name;

@Column(name="sex")
private String sex;

@Column(name="date_of_birth")
private Date dateOfBirth;



I am using Thymeleaf and selection of patient in my scheduleStudy.html is shown below

scheduleStudy.html

<form method="POST" th:action="@/scheduleStudy" th:object="$study">

<p>
Select Patient<select th:field="*patient"
required="required" class="form-control">

<option th:each="patient: $patientList" th:value="$patient.id"
th:text="$patient.name"></option>
</select>
</p>


The form is loading successfully with list of Patients in dropdown. However, when I am submitting the form after filling out all the fields, I am receiving:

Validation failed for object='study'. Error count: 1 error on browser.

Also the controller entries for Study form

Study

@GetMapping("/scheduleStudy")
public String addSchedule(Model model)
List<Patient> patientList = patientService.getPatients();
model.addAttribute("patientList", patientList);
model.addAttribute("study", new Study());
return "scheduleStudy";


@PostMapping("/scheduleStudy")
public void processAddSchedule(@ModelAttribute Study study)
studyService.addStudy(study);




I have just started using Thymeleaf and I think I have dome some mistake in the patient field. Could anyone please help?

patient

EDIT 2: I have updated the method for POST request, but patient is still null in controller. The previous browser error is gone of course.

patient

@RequestMapping(value = "/scheduleStudy", method = RequestMethod.POST)
public String processAddSchedule(Model model, @Valid @ModelAttribute("study") Study study,
BindingResult bindingResult)
if (bindingResult.hasErrors())

else
studyService.addStudy(study);




public void processAddSchedule(@ModelAttribute Study study)

public void processAddSchedule(@ModelAttribute @Valid Study study)

@Valid

1 Answer
1

I was working on a similar task. As far as I learned when you post the study form Thymeleaf sends all fields as parameters to a POST request. It converts the Patient object to a String with toString(). Then when assembling the Study object it must convert the Patient back to the Object form. I solved this by registering 2 converters (toString and fromString) with the standard conversionService for Patient.

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