allow tags to be filtered by default for new and non-logged-in users

app/controllers/home_controller.rb

@@ -116,6 +116,11 @@ private
       conds[0] += " AND taggings.tag_id NOT IN (SELECT tag_id FROM " <<
         "tag_filters WHERE user_id = ?)"
       conds.push @user.id
+    else
+      # for logged-out users, filter defaults
+      conds[0] += " AND taggings.tag_id NOT IN (SELECT id FROM " <<
+        "tags WHERE filtered_by_default = ?)"
+      conds.push true
     end
 
     stories = Story.find(

app/models/user.rb

@@ -25,6 +25,7 @@ class User < ActiveRecord::Base
     :pushover_device, :email_messages, :pushover_messages
 
   before_save :check_session_token
+  after_create :create_default_tag_filters
 
   def check_session_token
     if self.session_token.blank?
@@ -32,6 +33,15 @@ class User < ActiveRecord::Base
     end
   end
 
+  def create_default_tag_filters
+    Tag.where(:filtered_by_default => true).each do |t|
+      tf = TagFilter.new
+      tf.tag_id = t.id
+      tf.user_id = self.id
+      tf.save
+    end
+  end
+
   def unread_message_count
     Keystore.value_for("user:#{self.id}:unread_messages").to_i
   end

app/views/filters/index.html.erb

@@ -4,15 +4,16 @@
 	</div>
 
   <p>
-  To hide stories tagged with certain tags, check them below.
+  To hide stories from the home page that have been tagged with certain tags,
+  check them below.
   </p>
 
   <%= form_tag "/filters", :method => :post do %>
     <table class="data zebra" cellspacing=0 width="75%">
     <tr>
-      <th width="10%">Hide</th>
+      <th width="7%">Hide</th>
       <th width="15%">Tag</th>
-      <th width="75%">Description</th>
+      <th width="78%">Description</th>
     </tr>
     <% Tag.all(:order => :tag).each do |tag| %>
       <tr>
@@ -21,7 +22,10 @@
           "checked" : "" %>></td>
         <td><a href="/t/<%= tag.tag %>" class="tag tag_<%= tag.tag %>"><%=
           tag.tag %></a></td>
-        <td><%= tag.description %></td>
+        <td><%= tag.description %>
+          <% if tag.filtered_by_default? %>
+            <em>(Filtered by default)</em>
+          <% end %></td>
       </tr>
     <% end %>
     </table>

db/migrate/20120906183346_default_filtered_tags.rb

@@ -0,0 +1,8 @@
+class DefaultFilteredTags < ActiveRecord::Migration
+  def up
+    add_column :tags, :filtered_by_default, :boolean, :default => false
+  end
+
+  def down
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20120902143549) do
+ActiveRecord::Schema.define(:version => 20120906183346) do
 
   create_table "comments", :force => true do |t|
     t.datetime "created_at",                                                                          :null => false
@@ -112,8 +112,9 @@ ActiveRecord::Schema.define(:version => 20120902143549) do
   add_index "taggings", ["story_id", "tag_id"], :name => "story_id_tag_id", :unique => true
 
   create_table "tags", :force => true do |t|
-    t.string "tag",         :limit => 25,  :default => "", :null => false
-    t.string "description", :limit => 100
+    t.string  "tag",                 :limit => 25,  :default => "",    :null => false
+    t.string  "description",         :limit => 100
+    t.boolean "filtered_by_default",                :default => false
   end
 
   add_index "tags", ["tag"], :name => "tag", :unique => true