Add error for dispatching within a dispatch

lib/Dispatcher.js

@@ -147,6 +147,9 @@ module.exports = function () {
      * @throws {Error} if store has handler registered that does not exist
      */
     Dispatcher.prototype.dispatch = function dispatch(actionName, payload) {
+        if (this.currentAction) {
+            throw new Error('Cannot call dispatch while another dispatch is executing');
+        }
         var actionHandlers = Dispatcher.handlers[actionName] || [],
             defaultHandlers = Dispatcher.handlers[DEFAULT] || [];
         if (!actionHandlers.length && !defaultHandlers.length) {

tests/mock/Store.js

@@ -31,6 +31,10 @@ Store.prototype.delay = function (payload) {
     });
 };
 
+Store.prototype.dispatch = function (payload) {
+    payload.dispatcher.dispatch('DISPATCH_IN_DISPATCH');
+};
+
 Store.prototype.getState = function () {
     return this.state;
 };
@@ -49,7 +53,8 @@ Store.handlers = {
         this.state.page = 'home';
     },
     'DELAY': 'delay',
-    'ERROR': 'error'
+    'ERROR': 'error',
+    'DISPATCH': 'dispatch'
 };
 
 module.exports = Store;

tests/unit/lib/Dispatcher.js

@@ -154,6 +154,17 @@ describe('Dispatchr', function () {
                 dispatcher.dispatch('ERROR', {});
             }).to.throw();
         });
+
+        it('should throw if a dispatch called within dispatch', function () {
+            var context = {test: 'test'},
+                dispatcher = new Dispatcher(context);
+
+            expect(function () {
+                dispatcher.dispatch('DISPATCH', {
+                    dispatcher: dispatcher
+                });
+            }).to.throw();
+        });
     });
 
     describe('#dehydrate', function () {