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copied!<p>One way to create a helper method is to create it outside of the <code>filters</code> closure, and pass the instance in. It doesn't work to pass in <code>this</code> because that's not the closure but the <code>UserFilters</code> instance. Instead pass in the closure's <code>delegate</code> which is where the <code>render</code> and <code>redirect</code> methods are added, where the attributes like <code>params</code> and <code>controllerName</code> are:</p> <pre><code>class UserFilters { def filters = { // ... other filters ... adminAllCheck(controller: 'administration', action: '*') { before = { doAdminCheck(delegate) } } userListCheck(controller: 'user', action: 'list') { before = { doAdminCheck(delegate) } } } private boolean doAdminCheck(filters) { if (!filters.session.isAdmin) { if (accountService.isAdmin()) { filters.session.isAdmin = true } else { filters.flash.message = 'Non admin' filters.redirect(controller: 'home', action: 'index') return false } } true } } </code></pre> <p>You can also use the <code>|</code> character in the <code>controller</code> and <code>action</code> arguments to do common work across controllers. It wouldn't work here directly since you use <code>*</code> for the admin controller and only apply to the <code>list</code> action in the user controller, but you can do an explicit controller/action name check for that:</p> <pre><code>adminCheck(controller: 'administration|user', action: '*') { if (controllerName == 'user' && actionName != 'list') { return true } // common logic here } </code></pre> <p>You could also move the logic to a service and dependency-inject that back in. It's usually not a good idea to mix tiers like that and have HTTP logic in a service, but that would keep the logic in one place. You could use the same trick with the delegate, or just pass in the session/request/response/etc. as needed.</p>

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