Only show filter button if the user has more than 2 posts

app/assets/javascripts/discourse/controllers/poster_expansion_controller.js

@@ -10,8 +10,10 @@ Discourse.PosterExpansionController = Discourse.ObjectController.extend({
   needs: ['topic'],
   visible: false,
   user: null,
+  participant: null,
 
-  showFilter: Em.computed.alias('controllers.topic.postStream.hasNoFilters'),
+  enoughPostsForFiltering: Em.computed.gte('participant.post_count', 2),
+  showFilter: Em.computed.and('controllers.topic.postStream.hasNoFilters', 'enoughPostsForFiltering'),
   showName: Discourse.computed.propertyNotEqual('user.name', 'user.username'),
 
   show: function(post) {
@@ -28,6 +30,14 @@ Discourse.PosterExpansionController = Discourse.ObjectController.extend({
     // If we're showing the same user we showed last time, just keep it
     if (post.get('username') === currentUsername) { return; }
 
+    this.set('participant', null);
+
+    // Retrieve their participants info
+    var participants = this.get('topic.details.participants');
+    if (participants) {
+      this.set('participant', participants.findBy('username', post.get('username')));
+    }
+
     var self = this;
     self.set('user', null);
     Discourse.User.findByUsername(post.get('username')).then(function (user) {

app/assets/javascripts/discourse/templates/poster_expansion.handlebars

@@ -19,7 +19,7 @@
       {{#link-to 'user' user class="btn"}}<i class='icon icon-user'></i>{{i18n user.show_profile}}{{/link-to}}
 
       {{#if showFilter}}
-        <button class='btn' {{action togglePosts user}}><i class='icon icon-filter'></i>{{i18n topic.filter_to username="username"}}</button>
+        <button class='btn' {{action togglePosts user}}><i class='icon icon-filter'></i>{{i18n topic.filter_to username="username" post_count="participant.post_count"}}</button>
       {{/if}}
 
     </div>

config/locales/client.en.yml

@@ -574,7 +574,7 @@ en:
       title: Topic Rank Details
 
     topic:
-      filter_to: "Show only posts by {{username}} in this topic"
+      filter_to: "Show only the {{post_count}} posts by {{username}} in this topic"
       create_in: 'Create {{categoryName}} Topic'
       create: 'Create Topic'
       create_long: 'Create a new Topic'