fix($resource): ignore undefined parameters

- $resource should handle multiple params with same name
- ignore slashes of undefined parameters
- fix default parameters issue, mentioned in #875

Closes #875
Closes #782

src/ngResource/resource.js

@@ -280,12 +280,17 @@ angular.module('ngResource', ['ng']).
       url: function(params) {
         var self = this,
             url = this.template,
+            val,
             encodedVal;
 
         params = params || {};
         forEach(this.urlParams, function(_, urlParam){
-          encodedVal = encodeUriSegment(params[urlParam] || self.defaults[urlParam] || "");
-          url = url.replace(new RegExp(":" + urlParam + "(\\W)"), encodedVal + "$1");
+          if (val = (params[urlParam] || self.defaults[urlParam])) {
+            encodedVal = encodeUriSegment(val);
+            url = url.replace(new RegExp(":" + urlParam + "(\\W)", "g"), encodedVal + "$1");
+          } else {
+            url = url.replace(new RegExp("/?:" + urlParam + "(\\W)", "g"), '$1');
+          }
         });
         url = url.replace(/\/?#$/, '');
         var query = [];
@@ -306,8 +311,9 @@ angular.module('ngResource', ['ng']).
 
       actions = extend({}, DEFAULT_ACTIONS, actions);
 
-      function extractParams(data){
+      function extractParams(data, actionParams){
         var ids = {};
+        paramDefaults = extend(paramDefaults, actionParams);
         forEach(paramDefaults || {}, function(value, key){
           ids[key] = value.charAt && value.charAt(0) == '@' ? getter(data, value.substr(1)) : value;
         });
@@ -362,7 +368,7 @@ angular.module('ngResource', ['ng']).
           var value = this instanceof Resource ? this : (action.isArray ? [] : new Resource(data));
           $http({
             method: action.method,
-            url: route.url(extend({}, extractParams(data), action.params || {}, params)),
+            url: route.url(extend({}, extractParams(data, action.params || {}), params)),
             data: data,
             headers: extend({}, action.headers || {})
           }).then(function(response) {

test/ngResource/resourceSpec.js

@@ -55,12 +55,14 @@ describe("resource", function() {
     $httpBackend.expect('GET', '/Path');
     $httpBackend.expect('GET', '/Path/1');
     $httpBackend.expect('GET', '/Path/2/3');
-    $httpBackend.expect('GET', '/Path/4/5/6');
+    $httpBackend.expect('GET', '/Path/4/5');
+    $httpBackend.expect('GET', '/Path/6/7/8');
 
     R.get({});
     R.get({a:1});
     R.get({a:2, b:3});
-    R.get({a:4, b:5, c:6});
+    R.get({a:4, c:5});
+    R.get({a:6, b:7, c:8});
   });
 
 
@@ -123,6 +125,27 @@ describe("resource", function() {
   });
 
 
+  it('should build resource with action default param reading the value from instance', function() {
+    $httpBackend.expect('POST', '/Customer/123').respond();
+    var R = $resource('/Customer/:id', {}, {post: {method: 'POST', params: {id: '@id'}}});
+
+    var inst = new R({id:123});
+    expect(inst.id).toBe(123);
+
+    inst.$post();
+  });
+
+
+  it('should handle multiple params with same name', function() {
+    var R = $resource('/:id/:id');
+
+    $httpBackend.when('GET').respond('{}');
+    $httpBackend.expect('GET', '/1/1');
+
+    R.get({id:1});
+  });
+
+
   it("should create resource", function() {
     $httpBackend.expect('POST', '/CreditCard', '{"name":"misko"}').respond({id: 123, name: 'misko'});