Form Select and Thymeleaf - spring

Question

I'm porting my app to Thymeleaf and i'm having problems in creating form select from List of Objects.
I have this form
<form th:with="reservationUrl=(${price != null} ? '/book/confirm' : '/book/new')"
th:action="#{${reservationUrl}}" method="POST"
class="form-signin" th:object="${reservation}"
id="form-signin">
<div class="form-group row">
<label class="col-sm-2 col-form-label" for="plate"
th:text="#{reservation.plate }">Targa</label>
<div class="col-sm-4 input-group">
<select th:type="*{plate}" class="form-control">
<option th:each="p : ${plates}"
th:value="${p.plateId}" th:text="${p.plateNumber}">Opzione</option>
</select>
</div>
// rest of the form
From the controller I have a List<Plate> plates and my Reservation has a Plate field, so it's a really basic select association (which worked with plain JSP)
I'm getting this exception
Exception evaluating SpringEL expression: "p.plateId" (reservation:67)] with root cause
Property or field 'plateId' cannot be found on object of type 'org.thymeleaf.util.EvaluationUtil$MapEntry' - maybe not public?
This is Plate
#Entity
public class Plate {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long plateId;
private String plateNumber;
private String plateName;
#ManyToOne
#JoinColumn(name="userId")
#JsonBackReference(value="plates-user-reference")
private User user;
private boolean favourite;
#JsonIgnore
private boolean enabled;
//standard getters and setters

Answer 1

EXAMPLE
<div class="form-group">
<label for="location">Pick a location:</label>
<select class="form-control" th:value="${appointment.location}" name="location" id="location"
>
<option disabled="disabled" selected="selected" > -- select the location --</option>
<option>Boston</option>
<option>New York</option>
<option>Chicago</option>
<option>San Francisco</option>
</select>
</div>
if you want to try a drop-down menu then yu can follow this way.