accessing items in firebase - angularjs

Question

I'm trying to learn firebase/angularjs by extending an app to use firebase as the backend.
My forge looks like this
.
In my program I have binded firebaseio.com/projects to $scope.projects.
How do I access the children?
Why doesn't $scope.projects.getIndex() return the keys to the children?
I know the items are in $scope.projects because I can see them if I do console.log($scope.projects)
app.js
angular.module('todo', ['ionic', 'firebase'])
/**
* The Projects factory handles saving and loading projects
* from localStorage, and also lets us save and load the
* last active project index.
*/
.factory('Projects', function() {
return {
all: function () {
var projectString = window.localStorage['projects'];
if(projectString) {
return angular.fromJson(projectString);
}
return [];
},
// just saves all the projects everytime
save: function(projects) {
window.localStorage['projects'] = angular.toJson(projects);
},
newProject: function(projectTitle) {
// Add a new project
return {
title: projectTitle,
tasks: []
};
},
getLastActiveIndex: function () {
return parseInt(window.localStorage['lastActiveProject']) || 0;
},
setLastActiveIndex: function (index) {
window.localStorage['lastActiveProject'] = index;
}
}
})
.controller('TodoCtrl', function($scope, $timeout, $ionicModal, Projects, $firebase) {
// Load or initialize projects
//$scope.projects = Projects.all();
var projectsUrl = "https://ionic-guide-harry.firebaseio.com/projects";
var projectRef = new Firebase(projectsUrl);
$scope.projects = $firebase(projectRef);
$scope.projects.$on("loaded", function() {
var keys = $scope.projects.$getIndex();
console.log($scope.projects.$child('-JGTmBu4aeToOSGmgCo1'));
// Grab the last active, or the first project
$scope.activeProject = $scope.projects.$child("" + keys[0]);
});
// A utility function for creating a new project
// with the given projectTitle
var createProject = function(projectTitle) {
var newProject = Projects.newProject(projectTitle);
$scope.projects.$add(newProject);
Projects.save($scope.projects);
$scope.selectProject(newProject, $scope.projects.length-1);
};
// Called to create a new project
$scope.newProject = function() {
var projectTitle = prompt('Project name');
if(projectTitle) {
createProject(projectTitle);
}
};
// Called to select the given project
$scope.selectProject = function(project, index) {
$scope.activeProject = project;
Projects.setLastActiveIndex(index);
$scope.sideMenuController.close();
};
// Create our modal
$ionicModal.fromTemplateUrl('new-task.html', function(modal) {
$scope.taskModal = modal;
}, {
scope: $scope
});
$scope.createTask = function(task) {
if(!$scope.activeProject || !task) {
return;
}
console.log($scope.activeProject.task);
$scope.activeProject.task.$add({
title: task.title
});
$scope.taskModal.hide();
// Inefficient, but save all the projects
Projects.save($scope.projects);
task.title = "";
};
$scope.newTask = function() {
$scope.taskModal.show();
};
$scope.closeNewTask = function() {
$scope.taskModal.hide();
};
$scope.toggleProjects = function() {
$scope.sideMenuController.toggleLeft();
};
// Try to create the first project, make sure to defer
// this by using $timeout so everything is initialized
// properly
$timeout(function() {
if($scope.projects.length == 0) {
while(true) {
var projectTitle = prompt('Your first project title:');
if(projectTitle) {
createProject(projectTitle);
break;
}
}
}
});
});
I'm interested in the objects at the bottom
console.log($scope.projects)
Update
After digging around it seems I may be accessing the data incorrectly. https://www.firebase.com/docs/reading-data.html
Here's my new approach
// Load or initialize projects
//$scope.projects = Projects.all();
var projectsUrl = "https://ionic-guide-harry.firebaseio.com/projects";
var projectRef = new Firebase(projectsUrl);
projectRef.on('value', function(snapshot) {
if(snapshot.val() === null) {
console.log('location does not exist');
} else {
console.log(snapshot.val()['-JGTdgGAfq7dqBpSk2ls']);
}
});
$scope.projects = $firebase(projectRef);
$scope.projects.$on("loaded", function() {
// Grab the last active, or the first project
$scope.activeProject = $scope.projects.$child("a");
});
I'm still not sure how to traverse the keys programmatically but I feel I'm getting close

Answer 1

It's an object containing more objects, loop it with for in:
for (var key in $scope.projects) {
if ($scope.projects.hasOwnProperty(key)) {
console.log("The key is: " + key);
console.log("The value is: " + $scope.projects[key]);
}
}

Answer 2

ok so val() returns an object. In order to traverse all the children of projects I do
// Load or initialize projects
//$scope.projects = Projects.all();
var projectsUrl = "https://ionic-guide-harry.firebaseio.com/projects";
var projectRef = new Firebase(projectsUrl);
projectRef.on('value', function(snapshot) {
if(snapshot.val() === null) {
console.log('location does not exist');
} else {
var keys = Object.keys(snapshot.val());
console.log(snapshot.val()[keys[0]]);
}
});
$scope.projects = $firebase(projectRef);
$scope.projects.$on("loaded", function() {
// Grab the last active, or the first project
$scope.activeProject = $scope.projects.$child("a");
});
Note the var keys = Object.keys() gets all the keys at firebaseio.com/projects then you can get the first child by doing snapshot.val()[keys[0])