moderators have to provide a reason for deleting others' comments

app/assets/javascripts/application.js.erb

@@ -368,6 +368,18 @@ $(document).ready(function() {
     }
   });
 
+  $(document).on("click", "a.comment_moderator", function() {
+    var reason = prompt("Moderation reason:");
+    if (reason == null || reason == "")
+      return false;
+
+    var li = $(this).closest(".comment");
+    $.post("/comments/" + $(li).attr("data-shortid") + "/delete",
+      { reason: reason }, function(d) {
+        $(li).replaceWith(d);
+      });
+  });
+
   $(document).on("click", "a.comment_undeletor", function() {
     if (confirm("Are you sure you want to undelete this comment?")) {
       var li = $(this).closest(".comment");

app/controllers/comments_controller.rb

@@ -111,7 +111,7 @@ class CommentsController < ApplicationController
       return render :text => "can't find comment", :status => 400
     end
 
-    comment.delete_for_user(@user)
+    comment.delete_for_user(@user, params[:reason])
 
     render :partial => "comment", :layout => false,
       :content_type => "text/html", :locals => { :comment => comment }

app/models/comment.rb

@@ -185,7 +185,7 @@ class Comment < ActiveRecord::Base
     self.markeddown_comment = self.generated_markeddown_comment
   end
 
-  def delete_for_user(user)
+  def delete_for_user(user, reason = nil)
     Comment.record_timestamps = false
 
     self.is_deleted = true
@@ -197,6 +197,11 @@ class Comment < ActiveRecord::Base
       m.comment_id = self.id
       m.moderator_user_id = user.id
       m.action = "deleted comment"
+
+      if reason.present?
+        m.reason = reason
+      end
+
       m.save
     end
 

app/views/comments/_comment.html.erb

@@ -75,7 +75,11 @@ class="comment <%= comment.current_vote ? (comment.current_vote[:vote] == 1 ?
           <a class="comment_undeletor">undelete</a>
         <% elsif !comment.is_gone? && comment.is_deletable_by_user?(@user) %>
           |
-          <a class="comment_deletor">delete</a>
+          <% if @user && @user.is_moderator? && @user.id != comment.user_id %>
+            <a class="comment_moderator">delete</a>
+          <% else %>
+            <a class="comment_deletor">delete</a>
+          <% end %>
         <% end %>
 
         <% if @user && !comment.story.is_gone? && !comment.is_gone? %>