Thymeleaf: print a Set in the template - spring-boot

Question

I have a basic SpringBoot 2.0.4.RELEASE app. using Spring Initializer, JPA, embedded Tomcat, Thymeleaf template engine, and package as an executable JAR file.
I have this entity:
#Entity
#Table(name="t_user")
public class User implements Serializable, UserDetails {
#OneToMany(mappedBy = "user", cascade = CascadeType.ALL, fetch = FetchType.EAGER)
#JsonIgnore
private Set<UserRole> userRoles = new HashSet<>();
public Set<UserRole> getUserRoles() {
return userRoles;
}
public void setUserRoles(Set<UserRole> userRoles) {
this.userRoles = userRoles;
}
}
and this:
#Entity
#Table(name = "t_user_role")
public class UserRole implements Serializable {
/** The Serial Version UID for Serializable classes. */
private static final long serialVersionUID = 1L;
public UserRole() {
}
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private long id;
public UserRole(User user, Role role) {
this.user = user;
this.role = role;
}
#ManyToOne(fetch = FetchType.EAGER)
#JoinColumn(name = "user_id")
private User user;
#ManyToOne(fetch = FetchType.EAGER)
#JoinColumn(name = "role_id")
private Role role;
...
}
and want to print all the roles of a User, so I use this code:
<td class="col_name" th:text="${user.userRoles.role}"></td><!-- ROLES -->
but what I see in the browser is literally this:
com.tdk.backend.persistence.domain.backend.User.userRoles

Answer 1

You will want to iterate through the set of objects to print the role values. You can use Thymeleaf's th:each syntax to do so:
<td class="col_name">
<span th:each="userRole : ${user.userRoles}" th:text="${userRole.role}">[role]</span><!-- format with line breaks as needed -->
</td>
You can alternatively look at the lists utility and call the toString() to output for a quick and dirty way:
<td class="col_name">
<span th:text="${#lists.toString(user.userRole.role)}">[role]</span>
</td>
You can optionally remove the <span> tags by using th:remove="tag".