Handle url being a method correctly.

@@ -11,7 +11,7 @@ define(function(require) {
         initialize: function(data, options) {
             this.url = function() {
                 var url = options.search.url;
-                return _.isFunction(url) ? url.call() : url;
+                return _.isFunction(url) ? url.call(options.search) : url;
             };
             _.each(this.keys(), _.bind(function(facetName) {
                 var facet = this.get(facetName);