Added basic upvoting algorithm.

tmeasday · tmeasday · commit ee969bcca51d · 2015-10-19T22:29:09.000+11:00
chapter13-1
diff --git a/client/templates/posts/post_item.html b/client/templates/posts/post_item.html
@@ -1,8 +1,10 @@
 <template name="postItem">
   <div class="post">
+    <a href="#" class="upvote btn btn-default">⬆</a>
     <div class="post-content">
       <h3><a href="{{url}}">{{title}}</a><span>{{domain}}</span></h3>
       <p>
+        {{votes}} Votes,
         submitted by {{author}},
         <a href="{{pathFor 'postPage'}}">{{commentsCount}} comments</a>
         {{#if ownPost}}<a href="{{pathFor 'postEdit'}}">Edit</a>{{/if}}
diff --git a/client/templates/posts/post_item.js b/client/templates/posts/post_item.js
@@ -7,4 +7,11 @@ Template.postItem.helpers({
     a.href = this.url;
     return a.hostname;
   }
+});
+
+Template.postItem.events({
+  'click .upvote': function(e) {
+    e.preventDefault();
+    Meteor.call('upvote', this._id);
+  }
 });
diff --git a/lib/collections/posts.js b/lib/collections/posts.js
@@ -56,13 +56,32 @@ Meteor.methods({
       userId: user._id, 
       author: user.username, 
       submitted: new Date(),
-      commentsCount: 0
+      commentsCount: 0,
+      upvoters: [], 
+      votes: 0
     });
     
     var postId = Posts.insert(post);
     
     return {
       _id: postId
     };
+  },
+  
+  upvote: function(postId) {
+    check(this.userId, String);
+    check(postId, String);
+    
+    var post = Posts.findOne(postId);
+    if (!post)
+      throw new Meteor.Error('invalid', 'Post not found');
+    
+    if (_.include(post.upvoters, this.userId))
+      throw new Meteor.Error('invalid', 'Already upvoted this post');
+    
+    Posts.update(post._id, {
+      $addToSet: {upvoters: this.userId},
+      $inc: {votes: 1}
+    });
   }
 });
diff --git a/server/fixtures.js b/server/fixtures.js
@@ -18,7 +18,8 @@ if (Posts.find().count() === 0) {
     author: sacha.profile.name,
     url: 'http://sachagreif.com/introducing-telescope/',
     submitted: new Date(now - 7 * 3600 * 1000),
-    commentsCount: 2
+    commentsCount: 2,
+    upvoters: [], votes: 0
   });
   
   Comments.insert({
@@ -43,7 +44,8 @@ if (Posts.find().count() === 0) {
     author: tom.profile.name,
     url: 'http://meteor.com',
     submitted: new Date(now - 10 * 3600 * 1000),
-    commentsCount: 0
+    commentsCount: 0,
+    upvoters: [], votes: 0
   });
   
   Posts.insert({
@@ -52,7 +54,8 @@ if (Posts.find().count() === 0) {
     author: tom.profile.name,
     url: 'http://themeteorbook.com',
     submitted: new Date(now - 12 * 3600 * 1000),
-    commentsCount: 0
+    commentsCount: 0,
+    upvoters: [], votes: 0
   });
   
   for (var i = 0; i < 10; i++) {
@@ -62,7 +65,8 @@ if (Posts.find().count() === 0) {
       userId: sacha._id,
       url: 'http://google.com/?q=test-' + i,
       submitted: new Date(now - i * 3600 * 1000 + 1),
-      commentsCount: 0
+      commentsCount: 0,
+      upvoters: [], votes: 0
     });
   }
 }
