Interpolate Urls in angular, i used this code for maintain the same logic in router backend (SailsJS) and front-end requests (AngularJS), interpolated urls are like '/reportes/:categoria_id', and the helper method replace the label with a value for generate a clean, understandable and maintainable request logics

angular-Interpolate-url

// I use this method as a service like this:

App.service("Helpers", [ 
  function() {

  var method = {};

    method.interpolateUrl = function(url, obj, fn){

    var interpolated = []
    var paramLen = Object.keys(obj[0]).length

    url.forEach(function(e, i){
      var ur = e.url
      var matches = ur.match(/:([a-z]\w*)/gi).length
      var aux

      if(matches == paramLen){
        method._matches = function(rs){
          rs.replace(/:([a-z]\w*)/gi, function($0, label){
            if(obj[i].hasOwnProperty(label)){
              aux = rs.replace($0, obj[i][label])
              method._matches(aux)
            }
          });
          interpolated.push(aux);
        }
        method._matches(ur);
      }else{
        console.log("Interpolate Mismatch", url, obj);
      }

    });

    var interpolatedU = interpolated.filter(function(e,p){
      return interpolated.indexOf(e) == p
    });

    return fn(interpolatedU)
  }


  return method;

  } ])
  
  
// can be used in a factory with promises

App.factory("AppFactory", [ "$http", "$rootScope", "$q", "Helpers",
  function($http, $rootScope, $q, Helpers) {

  var method = {};

  method.exampleMethod = function(obj){

    var deferred = $q.defer();
    var urls = [
                { url: API_URL + "/reportes/:categoria_id/reservas/:reserva_id/empresas/:empresa_id" }
               ];
    var promises = [];

    Helpers.interpolateUrl(urls, obj, function(interpolatedUrls){

      urls.forEach(function(url, i){
        promises.push($http({ method: "GET", url: interpolatedUrls[i] }))
      });

      $q.all(promises).then(function(data){
        deferred.resolve({
          "promisedRequest": data
        })
      })
    })

    return deferred.promise;
  };

  return method;

} ])


// in the controller the usage is very easy:

var obj = [{ categoria_id: 12, reserva_id: 66, evaluacion_id: 88, empresa_id:829 }]

AppFactory.exampleMethod(obj).then(function(promise){
	console.log(promise)
});