how to get data from factories to services in restapi - angularjs

Question

Here coupon is the my ng-model passing parameter from controllers. i getting the response data. i dont know how to get the this response from factory to services.
please help me..
var factmodule=angular.module("FactModule",["ngResource"]);
factmodule.factory("CouponFactory",function($resource){
var couponinfo;
var coupondata
return{
getcoupon:function(coupon){
var user=$resource("http://demo.foodzard.in/api/promocode?code="+coupon.offer);
user.get(function(data){
couponvalue=data
console.log(data);
return couponvalue;
})
}
}
})
Services code
var servctrl=angular.module("ServModule",["FactModule"]);
servctrl.service("CouponService",function(CouponFactory){
this.checkdata=function(coupon){
CouponFactory.getcoupon(coupon)
}
})
controllers code
// getting coupon code from ng-model in the text box
mainCtrl.controller("OrderController",function($scope,CouponService){
$scope.validate=function($scope.coupon){
CouponService.checkdata($scope.coupon)
}
});

Answer 1

If factmodule is in a separate module from servctrl then you need to inject the factmodule into the servctrl on creation of the angular module
e.g.
var servctl = angular.module('servctl', [
'factmodule']);
})();
what I would be doing is
app.factory("CouponFactory",function($resource){...
and
app.service("CouponService",function(CouponFactory){
Then they are in the same module and would be reachable

Answer 2

It is important to realize that invoking a $resource object method immediately returns an empty reference (object or array depending on isArray). Once the data is returned from the server the existing reference is populated with the actual data.1
Since the return couponvalue; statement occurs in a function that the $q service invokes in the future, the factory function which executes immediately does not return any data.
Instead return the empty user reference and use its $promise property to retrieve the data.
var factmodule=angular.module("FactModule",["ngResource"]);
factmodule.factory("CouponFactory",function($resource){
var couponinfo;
var coupondata
return {
getcoupon:function(coupon){
var user=$resource("http://demo.foodzard.in/api/promocode?code="+coupon.offer);
//return object reference
return user.get();
}
}
})
Use $promise property to retrieve data from the $q service.
var servctrl=angular.module("ServModule",["FactModule"]);
servctrl.service("CouponService",function(CouponFactory){
this.checkdata=function(coupon){
return resourceObject = CouponFactory.getcoupon(coupon);
//retrieve future data
resourceObject.$promise.then( onFullfilled(data) {
var couponvalue=data;
console.log(data);
});
});
});
The .then method of a promise takes a function as an argument. The $q service stores that function and invokes it in the future when the XHR completes.