03_lesson: dispatching fetchPosts async thunk

02_lesson_starter/src/features/posts/PostsList.js

@@ -1,11 +1,26 @@
-import { useSelector } from 'react-redux';
-import { selectAllPosts } from './postsSlice';
+import { useDispatch, useSelector } from 'react-redux';
+import {
+  fetchPosts,
+  getPostsError,
+  getPostsStatus,
+  selectAllPosts,
+} from './postsSlice';
 import PostAuthor from './PostAuthor';
 import TimeAgo from './TimeAgo';
 import ReactionButtons from './ReactionButton';
 
 const PostsList = () => {
+  const dispatch = useDispatch();
+
   const posts = useSelector(selectAllPosts);
+  const postsStatus = useSelector(getPostsStatus);
+  const postsError = useSelector(getPostsError);
+
+  useEffect(() => {
+    if (postsStatus === 'idle') {
+      dispatch(fetchPosts());
+    }
+  }, [postsStatus, dispatch]);
 
   const orderedPosts = posts
     .slice()

02_lesson_starter/src/features/posts/postsSlice.js

@@ -87,6 +87,8 @@ const postsSlice = createSlice({
 });
 
 export const selectAllPosts = (state) => state.posts.posts; // first posts is meaning name of the slice
+export const getPostsStatus = (state) => state.posts.status;
+export const getPostsError = (state) => state.posts.error;
 
 export const { postAdded, reactionAdded } = postsSlice.actions;