Grails <g:select> woes

Question

I am using the Spring Security Plugin . By default this plugin has created three classes in my project.

org.me.example.UserRole.UserRole org.me.example.UserRole.User org.me.example.UserRole.Role

The User and Role classes are unaware of each other, but the UserRole class has both a User and a Role object. The Role object has only one attribute, a string called authority .

My objective is to obtain all Users with a certain authority in a <g:select> statement.

Here is one of my attempts:

<g:select name="loggedBy.id" from="${org.me.example.UserRole.UserRole.list(fetch:[(role.authority):"ROLE_ADMIN"])}" optionKey="id" value=""  />

I do realize that this would return a UserRole list and not a User list. Is there anyway to "join" my classes so I can retrieve the data I want? Looking for the cleanest solution.

Update:

I think there was some confusion about what my classes look like, so here are the stripped down versions.

---

class UserRole {

    User user
    Role role

    //more stuff

}

---

class Role {

    String authority

    //more stuff

}

---

class User {

    //lots of stuff, but nothing that links back to the Role class or the UserRole class

}

---

Crudof's answer worked for me after some alterations. Crudof pointed out that the package name UserRole does not follow Java package naming conventions. This is true, but if I remember right the Spring Security Core plugin automatically creates that package and the classes in it, so I didn't mess with the name... But it has been a while since I did that, so I could be mistaken about it automatically naming the package.

<g:set var="desiredRole" value='${org.me.example.UserRole.Role.findByAuthority("ROLE_ADMIN")}' />
<g:select name="loggedBy.id" from="${org.me.example.UserRole.UserRole.findAllByRole(desiredRole).user}" optionKey="id" value=""  />

Answer 1

It would be better to do this in a controller:

def usersWithAdminRole = UserRole.withCriteria {
  eq("role", Role.findByAuthority('ROLE_ADMIN'))
}.collect {
  it.user
}

<g:select from="${usersWithAdminRole}" name="loggedBy.id" optionKey="id" />

Answer 2

1. Your package names are not conform to common java-standards: package names should/HAVE TO start with lower case character. Otherwise one is confused, that it might be a class (where UserRole is a nested class of UserRole ).

2. Basically your code snippet is fine (concept-wise). Note, that you cannot use double-quotes in double-quotes attribute values. I think this has stopped your progress: You can try the following:

    <g:set var="desiredRole" value='${org.me.example.UserRole.findByAuthority("ROLE_ADMIN")}' /> <g:select name="userSelect" from="${org.me.example.UserRole.findAllByRole(desiredRole).user}" />

   Note that accessing the user-instances from the UserRole-instances is a groovy-sugar. See http://groovy.codehaus.org/Collections for a few examples.