Accessing parent $scope - angularjs

Question

I have posted earlier this post with the choice of not providing all my code. But now im stuck since with the same problem so I give it a change with providing all my code.
I know its not easy to debug when the code is huge so I will try to explain precisely the problem.
Actually the problem is described in my precedent post so please read it and look at the code that is a simplification of this one.
But basically the problem is : I want to access $scope.data.comments from the $scope.deleteComment() function
As you see the code below you will notice that I have to add ng-controller="CommentController" twice for this to work.
If someone could explain why.. that would be great but I guess that is another question.
Thanks in advance for your help.
MAIN HTML
<div ng-init="loadComments('${params.username}', '${params.urlname}' )" ng-controller="CommentController">
<div ng-repeat="comments in data.comments" >
<div sdcomment param="comments" ></div>
</div>
</div>
APP
var soundshareApp = angular.module('soundshareApp', ['ngCookies']);
DIRECTIVES
soundshareApp.directive('sdcomment', ['$cookies', function($cookies){
var discussionId = null;
var found = false;
var username = $cookies.soundshare_username;
return {
restrict:'A',
scope: {
commentData: '=param'
},
templateUrl: '/js/views/comment/templates/commentList.html',
link : function(scope, element, attrs, controller) {
scope.$watch(element.children(), function(){
var children = element.children();
for(var i=0; i<children.length; i++){
if(children[i].nodeType !== 8){ //pas un commentaire <!-- -->
if( !found ){
found = true;
discussionId == scope.commentData.discussionId
}else if(found && discussionId == scope.commentData.discussionId){
angular.element(children[i]).removeClass('message-content');
angular.element(children[i]).addClass('answer-message-content');
}
if(found && discussionId != scope.commentData.discussionId){
discussionId = scope.commentData.discussionId
}
if(username == scope.commentData.username){
element.parent().bind('mouseover', function() {
// $(".delete-comment-button").show()
element.parent().find("span.delete-comment-button:first").attr('style', 'display: block !important');
});
element.parent().bind('mouseleave', function() {
element.parent().find("span.delete-comment-button:first").attr('style', 'none: block !important');
});
}
}
}
});
}
}
}]);
TEMPLATE
<div class="message-wrapper" ng-controller="CommentController">
<div class='message-content' ng-click="state.show = !state.show; setUsername(commentData.username)">
<img class='message-vignette' ng-src='{{commentData.avatarUrl}}'/>
<div class='message-username'>{{commentData.username}}</div>
<div class='project-message'>{{commentData.comment}}</div>
<div class='message-date'>{{commentData.dateCreated | date:'dd.MM.yyyy # hh:mm:ss' }}</div>
<div class="clearfix"></div>
</div>
<div ng-repeat="answer in answers" class="answer-message-content" >
<div class='message-content' ng-click="state.show = !state.show">
<img class='message-vignette' ng-src='{{answer.avatarUrl}}'/>
<div class='message-username'>{{answer.username}}</div>
<div class='project-message'> {{answer.comment}}</div>
<div class='message-date'>{{answer.dateCreated | date:'MM/dd/yyyy # h:mma' }}</div>
<div class="clearfix"></div>
</div>
</div>
<div class="add-comment-content show-hide" ng-show="state.show" >
<img class='message-vignette answer-message-vignette' ng-src='{{commentData.currentUserAvatarUrl}}'>
<div class="">
<form ng-submit="addComment(commentData)" id="commentForm-{{commentData.projectId}}">
<input id="input-comment-{{commentData.projectId}}" type="text" maxlength="" autofocus="autofocus" name="comment" placeholder="Write a comment..." ng-model="commentData.msg">
<input type="hidden" name="discussionId" value="{{commentData.discussionId}}" >
<input type="hidden" name="projectId" value="{{commentData.projectId}}" >
</form>
</div>
</div>
<span ng-click="deleteComment(commentData)" class="btn btn-default btn-xs delete-comment-button"><i class="icon-trash"></i></span>
</div>
CONTROLLER
'use strict';
soundshareApp.controller('CommentController', function($scope, $http) {
$scope.data = { comments : [] }
$scope.answers = [];
$scope.state = {}
$scope.project = { id : [] }
$scope.username = null;
$scope.loadComments = function(userName, urlName){
$http({
url: '/comment/by_project_id',
method: "GET",
params:
{
username: userName,
urlname: urlName
}
}).success(function(data) {
$scope.data.comments = data;
console.log($scope.data.comments);//WORKING
});;
}
$scope.addComment = function(commentData){
if("undefined" != commentData.msg){
commentData.msg = "#" + $scope.username + ": " + commentData.msg;
$http({
method : "POST",
url : "/comment/addAnswer",
params:
{
comment: commentData.msg,
discussionId: commentData.discussionId,
projectId:commentData.projectId
}
}).success(function(data){
$scope.answers.push(data);
$('.show-hide').hide();
$scope.commentData.msg = '';
});
}
}
$scope.setUsername = function(username){
$scope.username = username;
}
$scope.deleteComment = function ( comment ) {
console.log($scope.data.comments);//NOT WORKING
};
});