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POHow to access controller dynamic properties within a base controller's constructor in Grails?
 

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  1. POHow to access controller dynamic properties within a base controller's constructor in Grails?
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    <p>Basically, I want to be able to assign objects created within filters to members in a base controller from which every controller extends. Any possible way to do that?</p> <p>Here's how I tried, but haven't got to make it work.</p> <p>What I'm trying to achieve is to have all my controllers extend a base controller. The base controller's constructor would be used to assign values to its members, those values being pulled from the <em>session</em> map. Example below.</p> <p>File grails-app/controllers/HomeController.groovy:</p> <pre><code>class HomeController extends BaseController { def index = { render username } } </code></pre> <p>File grails-app/controllers/BaseController.groovy:</p> <pre><code>abstract class BaseController { public String username public BaseController() { username = session.username } } </code></pre> <p>When running the app, the output shown is:</p> <pre><code>2010-06-15 18:17:16,671 [main] ERROR [localhost].[/webapp] - Exception sending context initialized event to listener instance of class org.codehaus.groovy.grails.web.context.GrailsContextLoaderListener org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'pluginManager' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Invocation of init method failed; nested exception is java.lang.RuntimeException: Unable to locate constructor with Class parameter for class org.codehaus.groovy.grails.commons.DefaultGrailsControllerClass ... Caused by: java.lang.RuntimeException: Unable to locate constructor with Class parameter for class org.codehaus.groovy.grails.commons.DefaultGrailsControllerClass ... Caused by: java.lang.reflect.InvocationTargetException ... Caused by: org.codehaus.groovy.grails.exceptions.NewInstanceCreationException: Could not create a new instance of class [com.my.package.controller.HomeController]! ... Caused by: groovy.lang.MissingPropertyException: No such property: session for class: com.my.package.controller.HomeController at com.my.package.controller.BaseController.&lt;init&gt;(BaseController.groovy:16) at com.my.package.controller.HomeController.&lt;init&gt;(HomeController.groovy) ... 2010-06-15 18:17:16,687 [main] ERROR core.StandardContext - Error listenerStart 2010-06-15 18:17:16,687 [main] ERROR core.StandardContext - Context [/webapp] startup failed due to previous errors </code></pre> <p>And the app won't run.</p> <p>This is just an example as in my case I wouldn't want to assign a username to a string value, but rather a few objects pulled from the <em>session</em> map. The objects pulled from the <em>session</em> map are being set within filters.</p> <p>The alternative I see is being able to access the controller's instance within the filter's execution. Is that possible?</p> <p>Please help! Thanks a bunch!</p>
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