I am new to grails and I have a question about limiting a query result:
domain User:

```
class User {    
    String login
    String password
    String fname
    String lname
    String role = "user"    

    static constraints = {
        login    (size:5..15, blank:false, unique:true, matches:"[a-zA-Z0-9]+")
        password (size:5..15, blank:false)
        fname    (blank:false)
        lname    (blank:false)
        role     (inList:["user", "admin"])
    }

    String toString(){
        fname & " " & lname
    }

    static mapping = {
        cache true

        columns {
            fname     type:'text'
            lname     type: 'text'
            password  type:'text'
            login     type:'text'
        }   
    }
}

```

my GSP page snippet that displays the results:

```
<g:each in="${userInstanceList}" status="i" var="userInstance">
  <tr class="${(i % 2) == 0 ? 'odd' : 'even'}">
    <td><g:link action="show" id="${userInstance.id}">
      ${fieldValue(bean: userInstance, field:   "id")}</g:link></td>
    <td>${fieldValue(bean: userInstance, field: "login")}</td>
    <td>****</td>
    <td>${fieldValue(bean: userInstance, field: "fname")}</td>
    <td>${fieldValue(bean: userInstance, field: "lname")}</td>
    <td>${fieldValue(bean: userInstance, field: "role")}</td>
  </tr>
</g:each>

```

I call the controller with this code, in separate gsp view:

```
<g:link class="users" controller="user" params="[sort:'fname',order:'desc']" action="">Manager Users</g:link>

```

My question is, how do I call the domain and display the results according to the following criteria: first, if the Role is admin, display everything. If the role is not admin, only display the results of certain login value (ie, just show the results where the login = the current user)

Thanks for your help!
jason