Grails uses a convention but that convention can easily be broken.
class SomeController {
def list() {
def users = Users.list()
def items = Item.list()
[users: users, items: items]
}
}
grails-app/views/some/list.gsp
<ul>
<g:each in="${users}">
<li>${it.firstName}</li>
</g:each>
</ul>
<ul>
<g:each in="${items}">
<li>${it.name}</li>
</g:each>
</ul>