How to access controller dynamic properties within a base controller's constructor in Grails?
- by 4h34d
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?
Here's how I tried, but haven't got to make it work.
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 session map. Example below.
File grails-app/controllers/HomeController.groovy:
class HomeController extends BaseController {
def index = {
render username
}
}
File grails-app/controllers/BaseController.groovy:
abstract class BaseController {
public String username
public BaseController() {
username = session.username
}
}
When running the app, the output shown is:
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.<init>(BaseController.groovy:16)
at com.my.package.controller.HomeController.<init>(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
And the app won't run.
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 session map. The objects pulled from the session map are being set within filters.
The alternative I see is being able to access the controller's instance within the filter's execution. Is that possible?
Please help! Thanks a bunch!
