use session object in grails navigation api - session

Question

I'm using the navigation api from the grails platform core. I'm trying to get a session variable to be used in the title of one of the links (a person's name). According to the docs in the section visibility and status:
The closures receive a delegate which resolves the following standard Grails properties:
grailsApplication
pageScope
session
request
controllerName
actionName
flash
params
That seems to indicate I would have the session available in navigation.groovy. In my navigation.groovy I have a menu defined as:
import grails.util.GrailsWebUtil
import org.codehaus.groovy.grails.plugins.springsecurity.SecurityRequestHolder
import org.codehaus.groovy.grails.plugins.springsecurity.SpringSecurityUtils
import org.springframework.orm.hibernate3.SessionFactoryUtils
navigation = {
def isBF = { ->
SpringSecurityUtils.ifAllGranted('ROLE_BF')
}
def indexTitleName = { ->
return session.id
}
app {
home controller:'birthFamily', action:'contactInfo'
}
birthFamily {
index(titleText:indexTitleName())
}
}
Program will not start and generates this error:
| Error 2013-10-18 08:16:57,286 [localhost-startStop-1] ERROR context.GrailsContextLoader - Error initializing the application: Exception evaluating property 'id' for java.util.ArrayList, Reason: groovy.lang.MissingPropertyException: No such property: id for class: org.grails.plugin.platform.conventions.DSLBlockCommand
Message: Exception evaluating property 'id' for java.util.ArrayList, Reason: groovy.lang.MissingPropertyException: No such property: id for class: org.grails.plugin.platform.conventions.DSLBlockCommand
Line | Method
->> 12 | doCall in NrfaNavigation$_run_closure1_closure3
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| 28 | doCall in NrfaNavigation$_run_closure1_closure6
| 53 | __newBlock . . . . . . . . . . . in org.grails.plugin.platform.conventions.StandardDSLDelegate
| 66 | methodMissing in ''
| 25 | doCall . . . . . . . . . . . . . in NrfaNavigation$_run_closure1
| 46 | build in org.grails.plugin.platform.conventions.StandardDSLBuilder
| 31 | evaluate . . . . . . . . . . . . in org.grails.plugin.platform.conventions.DSLEvaluator
| 280 | registerNavigation in org.grails.plugin.platform.navigation.NavigationImpl
If I replace 'session.id' with 'hello world' all is well.

Answer 1

According to the docs you need to create closures:
Note how the Closures are "def"'d in the script to make them reusable
and reachable within the DSL
The closures receive a delegate which resolves the following standard
Grails properties:
grailsApplication
pageScope
session
request
controllerName
actionName
flash params
So you need something like:
def indexTitleName = {
return session.fullName
}
navigation = {
account {
index(titleText:indexTitleName)
}
}
Edit
It seems that the closure it's applied only when you use the visible attribute. To get the session, chage your navigation class:
import org.codehaus.groovy.grails.web.util.WebUtils
def indexTitleName = {
def webUtils = WebUtils.retrieveGrailsWebRequest()
def session = webUtils.getCurrentRequest().getSession()
return session.fullName
}