02_lesson: Added ReactionButton for emoji thumbs up/down

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

@@ -1,7 +1,8 @@
-import { useSelector } from "react-redux";
-import { selectAllPosts } from "./postsSlice";
-import PostAuthor from "./PostAuthor";
-import TimeAgo from "./TimeAgo";
+import { useSelector } from 'react-redux';
+import { selectAllPosts } from './postsSlice';
+import PostAuthor from './PostAuthor';
+import TimeAgo from './TimeAgo';
+import ReactionButtons from './ReactionButton';
 
 const PostsList = () => {
   const posts = useSelector(selectAllPosts);
@@ -18,6 +19,7 @@ const PostsList = () => {
         <PostAuthor userId={post.userId} />
         <TimeAgo timestamp={post.date} />
       </p>
+      <ReactionButtons post={post} />
     </article>
   ));
 

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

@@ -0,0 +1,32 @@
+import { useDispatch } from 'react-redux';
+import { reactionAdded } from './postsSlice';
+
+const reactionEmoji = {
+  thumbsUp: '👍',
+  wow: '😮',
+  heart: '❤️',
+  rocket: '🚀',
+  coffee: '☕',
+};
+
+const ReactionButtons = ({ post }) => {
+  const dispatch = useDispatch();
+  const reactionButtons = Object.entries(reactionEmoji).map(([name, emoji]) => {
+    return (
+      <button
+        key={name}
+        type="button"
+        className="reactionButton"
+        onClick={() =>
+          dispatch(reactionAdded({ postId: post.id, reaction: name }))
+        }
+      >
+        {emoji} {post.reactions[name]}
+      </button>
+    );
+  });
+
+  return <div>{reactionButtons}</div>;
+};
+
+export default ReactionButtons;

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

@@ -7,12 +7,26 @@ const initialState = [
     title: "Learning Redux Toolkit",
     content: "I've heard good things.",
     date: sub(new Date(), { minutes: 10 }).toISOString(),
+    reactions: {
+      thumbsUp: 0,
+      wow: 0,
+      heart: 0,
+      rocket: 0,
+      coffee: 0,
+    },
   },
   {
     id: "2",
     title: "Slice...",
     content: "The more I say slice, the more I want pizza.",
     date: sub(new Date(), { minutes: 5 }).toISOString(),
+    reactions: {
+      thumbsUp: 0,
+      wow: 0,
+      heart: 0,
+      rocket: 0,
+      coffee: 0,
+    },
   },
 ];
 
@@ -33,15 +47,29 @@ const postsSlice = createSlice({
             content,
             userId,
             date: new Date().toISOString(),
+            reactions: {
+              thumbsUp: 0,
+              wow: 0,
+              heart: 0,
+              rocket: 0,
+              coffee: 0,
+            },
           },
         };
       },
     },
+    reactionAdded(state, action) {
+      const { postId, reaction } = action.payload;
+      const existingPost = state.find((post) => post.id === postId);
+      if (existingPost) {
+        existingPost.reactions[reaction]++; // this kind of immer action can only happen in slice
+      }
+    },
   },
 });
 
 export const selectAllPosts = (state) => state.posts;
 
-export const { postAdded } = postsSlice.actions;
+export const { postAdded, reactionAdded } = postsSlice.actions;
 
 export default postsSlice.reducer;