Prevent leading hash in chat channel field

Author: themightychris

html-templates/projects/projectEdit.tpl

@@ -51,7 +51,7 @@
                     </div>
                     <div class="form-group">
                         <label for="field-chat-channel">{_ "Chat Channel/Hashtag"}:</label>
-                        <input name="ChatChannel" id="field-chat-channel" class="form-control" placeholder="train_schedule_analyzer" value="{refill field=ChatChannel default=$Project->ChatChannel}"/>
+                        <input name="ChatChannel" id="field-chat-channel" class="form-control" placeholder="train_schedule_analyzer" value="{refill field=ChatChannel default=$Project->ChatChannel}" pattern="[A-Za-z0-9_]+" title="Hash tag containing only letters, numbers, or underscores without leading #"/>
                     </div>
                     <div class="form-group">
                         <label for="topicTagsInput">{_ 'Topic Tags'}:</label>

php-classes/Laddr/ProjectsRequestHandler.php

@@ -2,6 +2,7 @@
 
 namespace Laddr;
 
+use ActiveRecord;
 use Emergence\People\User;
 use Tag;
 use TagItem;
@@ -227,6 +228,15 @@ public static function handleUpdatesRequest(Project $Project)
         ]);
     }
 
+    protected static function applyRecordDelta(ActiveRecord $Project, $requestData)
+    {
+        if (!empty($requestData['ChatChannel']) && $requestData['ChatChannel'][0] == '#') {
+            $requestData['ChatChannel'] = substr($requestData['ChatChannel'], 1);
+        }
+
+        return parent::applyRecordDelta($Project, $requestData);
+    }
+
     public static function onRecordSaved(\ActiveRecord $Project, $requestData)
     {
         // assign tags