Spring roo and One-To-Many relationship in GUI generation - spring

Question

I cannot generate an appropriate GUI via roo for a one-to-many relationship. In particular, I would need a multiple choice element to select among the authorities (spring security) to associate to the user.
I created my RegisteredUser class:
#RooJavaBean
#RooToString
#RooJpaActiveRecord
public class RegisteredUser extends MyUser implements UserDetails,
CredentialsContainer {
private String password;
private String username;
private Boolean enabled = true;
private Boolean accountNonExpired = true;
private Boolean credentialsNonExpired = true;
private Boolean accountNonLocked = true;
#OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
private Set<MyBaseAuthority> authorities = new HashSet<MyBaseAuthority>();
#Override
public void eraseCredentials() {
password = null;
}
#Override
public Collection<? extends GrantedAuthority> getAuthorities() {
return authorities;
}
#Override
public String getPassword() {
return password;
}
#Override
public String getUsername() {
return username;
}
#Override
public boolean isAccountNonExpired() {
return accountNonExpired;
}
#Override
public boolean isAccountNonLocked() {
return accountNonLocked;
}
#Override
public boolean isCredentialsNonExpired() {
return credentialsNonExpired;
}
#Override
public boolean isEnabled() {
return enabled;
}
}
Then MyBaseAuthority class:
#RooJavaBean
#RooToString
#RooJpaActiveRecord
public class MyBaseAuthority extends ObjectWithId implements
GrantedAuthority {
private String authority;
#Override
public String getAuthority() {
return authority;
}
}
Then I had to manually create the controller for MyBaseAuthority, but not for RegisteredUser (generated by webmvc command):
#RequestMapping("/registeredusers")
#Controller
#RooWebScaffold(path = "registeredusers", formBackingObject = RegisteredUser.class)
public class RegisteredUserController {
}
#RequestMapping("/authorities")
#Controller
#RooWebScaffold(path = "authorities", formBackingObject = MyBaseAuthority.class)
public class MyBaseAuthorityController {
}
On the GUI, I can create and list all authorities and registered users. However, when creating a registered user, I can only set string fields and boolean fields, but not the one-to-many relationship. How can I fix that?

Answer 1

If I were trying to acomplish this task I would print out all of my checkboxes with the available options as array keys with a name like so:
<input type="checkbox" name="role[]" value="ROLE_ONE">
<input type="checkbox" name="role[]" value="ROLE_TWO">
Then, I would map these parameters to a String[] array like in this post
#RequestParam(value="myParam[]" String roles)
I would then loop over the strings and add create the MyBaseAuthority objects, attach your user and persist() them.