Service inject into another service - angularjs

Question

I got problem to inject a service to another one, however when I tested separately it seems work fine then.
My project structure is like this, app.html includes app.js, service1.js, service2.js, and they are placed in order.
Below is my code:
app.js
var aoApp = angular.module('aoApp', []);
aoApp.run(function (permissionService, userService) {
userService.setPermissions("['admin']");
permissionService.print();
});
service1.js
var app = angular.module('aoApp');
app.service('userService', function(){
var user = {
permissions: []
};
this.setPermissions = function(permissions){
user.permissions = permissions;
};
this.getPermissions = function(){
return user.permissions;
};
return this;
});
service2.js
var app = angular.module('aoApp');
app.service('permissionService', function(userService){
var userGrantedPermissions = userService.getPermissions();
//Here always print '[]' rather '['admin']'
console.log(userGrantedPermissions);
this.print = function(){
console.log(userGrantedPermissions);
};
return this;
});
Problem is in service2.js (permissionService), parameter userGrantedPermissions is expected to be ['admin'], however its value keeps the default value '[]', I don't know if do something wrong here, but I tried to tested here, it works! so what's wrong with my code now? why doesn't it work here?

Answer 1

The problem is due to the execution of your code.
var app = angular.module('apps', []);
app.service('s1', function(){
console.log('in s1 ctor');
return this;
});
app.service('s2', function(s1){
console.log('in s2 ctor');
return this;
});
app.run(function(s1, s2){
console.log('executing run');
});
This will print:
in s1 ctor
in s2 ctor
executing run
Since the ctors run before the run method.
Your Fiddle example doesn't run the code the same way you do in your original example.
The original example does this in the ctor:
var userGrantedPermissions = userService.getPermissions();
Which is executed before the run method and therefore returns the init value [].
Your fiddle executes a method and doesn't run anything in the ctor.
Check out this JSFIDDLE.