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

app/controllers/home_controller.rb

@@ -116,6 +116,11 @@ def _find_stories_for_user_and_tag_and_newest_and_by_user(user, tag = nil,
      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

@@ -25,13 +25,23 @@ 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?
      self.session_token = Utils.random_str(60)
    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 @@
  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