From ac1be834dbdfa3c9e6a58ffb25fbca0f2fcd752b Mon Sep 17 00:00:00 2001
From: Nicola Molinari <nicola.molinari@commercetools.de>
Date: Fri, 5 Jun 2015 22:12:17 +0200
Subject: [PATCH] Allow to read state by store on action creator callback. Refs
 #43

Keep trailing whitespaces

Keep async action out of example for now
---
 README.md                                  | 6 +++---
 examples/counter/actions/CounterActions.js | 5 +++--
 src/createDispatcher.js                    | 7 ++++++-
 3 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/README.md b/README.md
index e3489e28e3..0be5301b2e 100644
--- a/README.md
+++ b/README.md
@@ -62,10 +62,10 @@ export function incrementAsync() {
   };
 }
 
-// Could also look into state in the callback form
+// Could also read state of a store in the callback form
 export function incrementIfOdd() {
-  return (dispatch, state) => {
-    if (state.counterStore % 2 === 0) {
+  return (dispatch, read) => {
+    if (read(counterStore) % 2 === 0) {
       return;
     }
 
diff --git a/examples/counter/actions/CounterActions.js b/examples/counter/actions/CounterActions.js
index 30ca2f9781..f4e4e6540d 100644
--- a/examples/counter/actions/CounterActions.js
+++ b/examples/counter/actions/CounterActions.js
@@ -2,6 +2,7 @@ import {
   INCREMENT_COUNTER,
   DECREMENT_COUNTER
 } from '../constants/ActionTypes';
+import { counterStore } from '../stores';
 
 export function increment() {
   return {
@@ -10,8 +11,8 @@ export function increment() {
 }
 
 export function incrementIfOdd() {
-  return (dispatch, state) => {
-    if (state.counterStore.counter % 2 === 0) {
+  return (dispatch, read) => {
+    if (read(counterStore) % 2 === 0) {
       return;
     }
 
diff --git a/src/createDispatcher.js b/src/createDispatcher.js
index f7fd86e4d9..206eb03d2b 100644
--- a/src/createDispatcher.js
+++ b/src/createDispatcher.js
@@ -121,7 +121,7 @@ export default function createDispatcher() {
       const action = actionCreator(...args);
       if (typeof action === 'function') {
         // Callback-style action creator
-        action(dispatch, currentState);
+        action(dispatch, read);
       } else {
         // Simple action creator
         dispatch(action);
@@ -129,6 +129,11 @@ export default function createDispatcher() {
     };
   }
 
+  // Allow to read the state of a store
+  function read(store) {
+    return currentState[getStoreKey(store)];
+  }
+
   return {
     wrapActionCreator,
     observeStores,