Change unmountRoot to expect only one root

Author: diogobeda

react_ujs/index.js

@@ -188,18 +188,17 @@ var ReactRailsUJS = {
   },
 
   unmountRoot: function(node) {
-    var targetRoots = this.roots.filter(
-      function(rootElement) {
-        return rootElement["node"] && (rootElement["node"] === node)
-      }
-    )
-    targetRoots.forEach(
+    var targetRoot = this.findRoot(node);
+    if (targetRoot) {
+      return;
+    }
+
+    targetRoot["root"].unmount();
+    this.roots = this.roots.filter(
       function(rootElement) {
-        rootElement["root"].unmount();
-        rootElement["root"] = null;
-        rootElement["node"] = null;
+        return rootElement["node"] !== node
       }
-    )
+    );
   }
 }