I am newbie in Grails. I am using Spring Security Grails plugin for Authentication purpose. I want to get current user in my view gsp file.
I am trying like this ...
<g:if test="${post.author == Person.get(springSecurityService.principal.id).id }">
<g:link controller="post" action="edit" id="${post.id}">
Edit this post
</g:link>
</g:if>
Here I want to show Edit this post link to only those posts who created by signed_in user. But It showing ERROR -
Error 500: Internal Server Error
URI
/groovypublish/post/list
Class
java.lang.NullPointerException
Message
Cannot get property 'principal' on null object
Here is my Post.groovy --
class Post {
static hasMany = [comments:Comment]
String title
String teaser
String content
Date lastUpdated
Boolean published = false
SortedSet comments
Person author
....... more code ....
Here is my Person.groovy Domain Class File --
class Person {
transient springSecurityService
String realName
String username
String password
boolean enabled
boolean accountExpired
boolean accountLocked
boolean passwordExpired
byte[] avatar
String avatarType
static hasMany = [followed:Person, posts:Post]
static searchable = [only: 'realName']
........ more code ......
Please help.
Try tags provided by springSecurity plugin, something like:
<sec:isLoggedIn>
<g:link controller="post" action="edit" id="${post.id}">
Edit this post
</g:link>
</sec:isLoggedIn>
Actually you are trying to inject a service on your GSP page, you can do it with some import statement on the page, but I would say it will not be good programming practice, I think you should send current logged In user's instance from the controller to the GSP page, and then perform a check on it:
let say you have the controller method:
def showPostPage(){
Person currentLoggedInUser = springSecurityService.getCurrentUser();
[currentLoggedInUser:currentLoggedInUser]
}
and on your GSP page:
<g:if test="${post.author == currentLoggedInUser }">
<g:link controller="post" action="edit" id="${post.id}">
Edit this post
</g:link>
</g:if>