Favorite groups

app/assets/javascripts/autocomplete.js

@@ -52,7 +52,7 @@
     var prefixes = "-|~|general:|gen:|artist:|art:|copyright:|copy:|co:|character:|char:|ch:";
     var metatags = "order|-status|status|-rating|rating|-locked|locked|child|" +
       "-user|user|-approver|approver|commenter|comm|noter|noteupdater|artcomm|-fav|fav|ordfav|" +
-      "sub|-pool|pool|ordpool";
+      "sub|-pool|pool|ordpool|favgroup";
 
     $fields_multiple.autocomplete({
       delay: 100,
@@ -140,6 +140,10 @@
         case "ordpool":
           Danbooru.Autocomplete.pool_source(term, resp, metatag);
           break;
+        case "favgroup":
+        case "-favgroup":
+          Danbooru.Autocomplete.favorite_group_source(term, resp, metatag);
+          break;
         default:
           Danbooru.Autocomplete.normal_source(term, resp);
           break;
@@ -370,6 +374,26 @@
       }
     });
   }
+
+  Danbooru.Autocomplete.favorite_group_source = function(term, resp, metatag) {
+    $.ajax({
+      url: "/favorite_groups.json",
+      data: {
+        "search[name_matches]": term,
+        "limit": 10
+      },
+      method: "get",
+      success: function(data) {
+        resp($.map(data, function(favgroup) {
+          return {
+            label: favgroup.name.replace(/_/g, " "),
+            value: metatag + ":" + favgroup.name,
+            post_count: favgroup.post_count
+          };
+        }));
+      }
+    });
+  }
 })();
 
 $(document).ready(function() {

app/assets/stylesheets/common/inline.css.scss

@@ -37,3 +37,7 @@ kbd.key {
 span.inactive {
   color: #AAA;
 }
+
+td a.last-page {
+  color: #666;
+}

app/assets/stylesheets/specific/forum.css.scss

@@ -52,10 +52,6 @@ div#c-forum-topics {
     margin-right: 0.5em;
   }
 
-  a.last-page {
-    color: #666;
-  }
-
   span.locked-topic {
     color: #666;
   }

app/assets/stylesheets/specific/pools.css.scss

@@ -46,10 +46,6 @@ div#c-pools {
     height: 10em;
   }
 
-  a.last-page {
-    color: #666;
-  }
-  
   div#a-show {
     div#description {
       margin-bottom: 1em;

app/assets/stylesheets/specific/posts.css.scss

@@ -368,11 +368,11 @@ div#c-posts {
       word-wrap: break-word;
     }
 
-    #search-seq-nav + #pool-nav {
+    #search-seq-nav + #pool-nav, #search-seq-nav + #favgroup-nav, #pool-nav + #favgroup-nav {
       margin-top: 0.5em;
     }
 
-    #pool-nav, #search-seq-nav {
+    #pool-nav, #search-seq-nav, #favgroup-nav {
       li {
         position: relative;
         text-align: center;

app/controllers/favorite_groups_controller.rb

@@ -0,0 +1,69 @@
+class FavoriteGroupsController < ApplicationController
+  before_filter :member_only, :except => [:index, :show]
+  respond_to :html, :xml, :json
+
+  def index
+    @favorite_groups = FavoriteGroup.search(params[:search]).order("updated_at desc").paginate(params[:page], :limit => params[:limit], :search_count => params[:search])
+    respond_with(@favorite_groups) do |format|
+      format.xml do
+        render :xml => @favorite_groups.to_xml(:root => "favorite-groups")
+      end
+    end
+  end
+
+  def show
+    @favorite_group = FavoriteGroup.find(params[:id])
+    @post_set = PostSets::FavoriteGroup.new(@favorite_group, params[:page])
+    respond_with(@favorite_group)
+  end
+
+  def new
+    @favorite_group = FavoriteGroup.new
+    respond_with(@favorite_group)
+  end
+
+  def create
+    @favorite_group = FavoriteGroup.create(params[:favorite_group])
+    respond_with(@favorite_group) do |format|
+      format.html do
+        if @favorite_group.errors.any?
+          render :action => "new"
+        else
+          redirect_to favorite_groups_path
+        end
+      end
+    end
+  end
+
+  def edit
+    @favorite_group = FavoriteGroup.find(params[:id])
+    check_privilege(@favorite_group)
+    respond_with(@favorite_group)
+  end
+
+  def update
+    # need to do this in order for synchronize! to work correctly
+    @favorite_group = FavoriteGroup.find(params[:id])
+    check_privilege(@favorite_group)
+    @favorite_group.attributes = params[:favorite_group]
+    @favorite_group.synchronize
+    @favorite_group.save
+    unless @favorite_group.errors.any?
+      flash[:notice] = "Favorite group updated"
+    end
+    respond_with(@favorite_group)
+  end
+
+  def destroy
+    @favorite_group = FavoriteGroup.find(params[:id])
+    check_privilege(@favorite_group)
+    @favorite_group.destroy
+    flash[:notice] = "Favorite group deleted"
+    redirect_to favorite_groups_path
+  end
+
+private
+  def check_privilege(favgroup)
+    raise User::PrivilegeError unless favgroup.editable_by?(CurrentUser.user)
+  end
+end

app/logical/anonymous_user.rb

@@ -221,6 +221,10 @@ class AnonymousUser
     false
   end
 
+  def favorite_groups
+    []
+  end
+
   %w(member banned gold builder platinum contributor janitor moderator admin).each do |name|
     define_method("is_#{name}?") do
       false

app/logical/post_query_builder.rb

@@ -312,6 +312,12 @@ class PostQueryBuilder
       relation = relation.order("position(' '||posts.id||' ' in ' '||(select post_ids from pools where id = #{pool_id})||' ')")
     end
 
+    if q[:favgroup].present?
+      favgroup_id = q[:favgroup].to_i
+      post_ids = FavoriteGroup.find(favgroup_id).post_id_array
+      relation = relation.where("posts.id in (?)", post_ids)
+    end
+
     if q[:ordfav].present?
       user_id = q[:ordfav].to_i
       relation = relation.joins("INNER JOIN favorites ON favorites.post_id = posts.id")

app/logical/post_sets/favorite_group.rb

@@ -0,0 +1,7 @@
+module PostSets
+  class FavoriteGroup < PostSets::Pool
+    def presenter
+      @presenter ||= PostSetPresenters::FavoriteGroup.new(self)
+    end
+  end
+end

app/models/favorite_group.rb

@@ -0,0 +1,211 @@
+require 'ostruct'
+
+class FavoriteGroup < ActiveRecord::Base
+  validates_uniqueness_of :name, :case_sensitive => false, :scope => :creator_id
+  validates_format_of :name, :with => /\A[^,]+\Z/, :message => "cannot have commas"
+  belongs_to :creator, :class_name => "User"
+  before_validation :normalize_post_ids
+  before_validation :normalize_name
+  before_validation :initialize_creator, :on => :create
+  before_validation :strip_name
+  validate :creator_can_create_favorite_groups, :on => :create
+  validate :validate_number_of_posts
+  after_create :synchronize!
+  attr_accessible :name, :post_ids, :post_id_array, :as => [:member, :gold, :platinum, :builder, :contributor, :janitor, :moderator, :admin, :default]
+
+  module SearchMethods
+    def for_creator(user_id)
+      where("favorite_groups.creator_id = ?", user_id)
+    end
+
+    def named(name)
+      where("lower(name) = ?", name.to_s.mb_chars.downcase.strip)
+    end
+
+    def name_matches(name)
+      name = name.tr(" ", "_")
+      name = "*#{name}*" unless name =~ /\*/
+      where("name ilike ? escape E'\\\\'", name.to_escaped_for_sql_like)
+    end
+
+    def search(params)
+      q = where("true")
+      params = {} if params.blank?
+
+      if params[:creator_id].present?
+        q = q.where("creator_id = ?", params[:creator_id].to_i)
+      elsif params[:creator_name].present?
+        q = q.where("creator_id = (select _.id from users _ where lower(_.name) = ?)", params[:creator_name].tr(" ", "_").mb_chars.downcase)
+      else
+        q = q.where("creator_id = ?", CurrentUser.user.id)
+      end
+
+      if params[:name_matches].present?
+        q = q.name_matches(params[:name_matches])
+      end
+
+      q
+    end
+  end
+
+  extend SearchMethods
+
+  def self.name_to_id(name)
+    if name =~ /^\d+$/
+      name.to_i
+    else
+      select_value_sql("SELECT id FROM favorite_groups WHERE lower(name) = ? AND creator_id = ?", name.to_s.mb_chars.downcase.tr(" ", "_"), CurrentUser.user.id).to_i
+    end
+  end
+
+  def creator_can_create_favorite_groups
+    if creator.favorite_group_count >= creator.favorite_group_limit
+      error = "You can only keep up to #{creator.favorite_group_limit} favorite groups."
+      if !CurrentUser.user.is_platinum?
+        error += " Upgrade your account to create more."
+      end
+      self.errors.add(:base, error)
+      return false
+    else
+      return true
+    end
+  end
+
+  def validate_number_of_posts
+    if post_id_array.size > 10_000
+      self.errors.add(:base, "Favorite groups can have up to 10,000 posts each")
+      return false
+    else
+      return true
+    end
+  end
+
+  def normalize_post_ids
+    self.post_ids = post_ids.scan(/\d+/).uniq.join(" ")
+  end
+
+  def normalize_name
+    self.name = name.gsub(/\s+/, "_")
+  end
+
+  def initialize_creator
+    self.creator_id = CurrentUser.id
+  end
+
+  def strip_name
+    self.name = name.to_s.strip
+  end
+
+  def pretty_name
+    name.tr("_", " ")
+  end
+
+  def posts(options = {})
+    offset = options[:offset] || 0
+    limit = options[:limit] || Danbooru.config.posts_per_page
+    slice = post_id_array.slice(offset, limit)
+    if slice && slice.any?
+      slice.map do |id|
+        begin
+          Post.find(id)
+        rescue ActiveRecord::RecordNotFound
+          # swallow
+        end
+      end.compact
+    else
+      []
+    end
+  end
+
+  def post_id_array
+    @post_id_array ||= post_ids.scan(/\d+/).map(&:to_i)
+  end
+
+  def post_id_array=(array)
+    self.post_ids = array.join(" ")
+    clear_post_id_array
+  end
+
+  def post_id_array_was
+    @post_id_array_was ||= post_ids_was.scan(/\d+/).map(&:to_i)
+  end
+
+  def clear_post_id_array
+    @post_id_array = nil
+    @post_id_array_was = nil
+  end
+
+  def synchronize
+    added = post_id_array - post_id_array_was
+    removed = post_id_array_was - post_id_array
+
+    normalize_post_ids
+    clear_post_id_array
+    self.post_count = post_id_array.size
+  end
+
+  def synchronize!
+    synchronize
+    save
+  end
+
+  def add!(post)
+    return if contains?(post.id)
+
+    update_attributes(:post_ids => add_number_to_string(post.id, post_ids), :post_count => post_count + 1)
+    clear_post_id_array
+  end
+
+  def remove!(post)
+    return unless contains?(post.id)
+
+    update_attributes(:post_ids => remove_number_from_string(post.id, post_ids), :post_count => post_count - 1)
+    clear_post_id_array
+  end
+
+  def add_number_to_string(number, string)
+    "#{string} #{number}"
+  end
+
+  def remove_number_from_string(number, string)
+    string.gsub(/(?:\A| )#{number}(?:\Z| )/, " ")
+  end
+
+  def neighbors(post)
+    @neighbor_posts ||= begin
+      post_ids =~ /\A#{post.id} (\d+)|(\d+) #{post.id} (\d+)|(\d+) #{post.id}\Z/
+
+      if $2 && $3
+        OpenStruct.new(:previous => $2.to_i, :next => $3.to_i)
+      elsif $1
+        OpenStruct.new(:next => $1.to_i)
+      elsif $4
+        OpenStruct.new(:previous => $4.to_i)
+      else
+        OpenStruct.new
+      end
+    end
+  end
+
+  def reload(options = {})
+    super
+    @neighbor_posts = nil
+    clear_post_id_array
+  end
+
+  def last_page
+    (post_count / CurrentUser.user.per_page.to_f).ceil
+  end
+
+  def strip_name
+    self.name = name.to_s.strip
+  end
+
+  def contains?(post_id)
+    post_ids =~ /(?:\A| )#{post_id}(?:\Z| )/
+  end
+
+  def editable_by?(user)
+    creator_id == user.id
+  end
+end

app/models/post.rb

@@ -629,7 +629,7 @@ class Post < ActiveRecord::Base
 
     def filter_metatags(tags)
       @pre_metatags, tags = tags.partition {|x| x =~ /\A(?:rating|parent|-parent):/i}
-      @post_metatags, tags = tags.partition {|x| x =~ /\A(?:-pool|pool|newpool|fav|child):/i}
+      @post_metatags, tags = tags.partition {|x| x =~ /\A(?:-pool|pool|newpool|fav|child|-favgroup|favgroup):/i}
       apply_pre_metatags
       return tags
     end
@@ -669,6 +669,22 @@ class Post < ActiveRecord::Base
           child = Post.find($1)
           child.parent_id = id
           child.save
+
+        when /^-favgroup:(\d+)$/i
+          favgroup = FavoriteGroup.where("id = ?", $1.to_i).for_creator(CurrentUser.user.id).first
+          favgroup.remove!(self) if favgroup
+
+        when /^-favgroup:(.+)$/i
+          favgroup = FavoriteGroup.named($1).for_creator(CurrentUser.user.id).first
+          favgroup.remove!(self) if favgroup
+
+        when /^favgroup:(\d+)$/i
+          favgroup = FavoriteGroup.where("id = ?", $1.to_i).for_creator(CurrentUser.user.id).first
+          favgroup.add!(self) if favgroup
+
+        when /^favgroup:(.+)$/i
+          favgroup = FavoriteGroup.named($1).for_creator(CurrentUser.user.id).first
+          favgroup.add!(self) if favgroup
         end
       end
     end
@@ -821,6 +837,14 @@ class Post < ActiveRecord::Base
     def favorited_users
       favorited_user_ids.map {|id| User.find(id)}
     end
+
+    def favorite_groups
+      @favorite_groups ||= begin
+        CurrentUser.user.favorite_groups.select do |favgroup|
+          favgroup.contains?(self.id)
+        end
+      end
+    end
   end
 
   module UploaderMethods
@@ -1578,6 +1602,7 @@ class Post < ActiveRecord::Base
     super
     reset_tag_array_cache
     @pools = nil
+    @favorite_groups = nil
     @tag_categories = nil
     @typed_tags = nil
     self

app/models/tag.rb

@@ -1,5 +1,5 @@
 class Tag < ActiveRecord::Base
-  METATAGS = "-user|user|-approver|approver|commenter|comm|noter|noteupdater|artcomm|-pool|pool|ordpool|-fav|fav|ordfav|sub|md5|-rating|rating|-locked|locked|width|height|mpixels|ratio|score|favcount|filesize|source|-source|id|-id|date|age|order|limit|-status|status|tagcount|gentags|arttags|chartags|copytags|parent|-parent|child|pixiv_id|pixiv"
+  METATAGS = "-user|user|-approver|approver|commenter|comm|noter|noteupdater|artcomm|-pool|pool|ordpool|favgroup|-fav|fav|ordfav|sub|md5|-rating|rating|-locked|locked|width|height|mpixels|ratio|score|favcount|filesize|source|-source|id|-id|date|age|order|limit|-status|status|tagcount|gentags|arttags|chartags|copytags|parent|-parent|child|pixiv_id|pixiv"
   SUBQUERY_METATAGS = "commenter|comm|noter|noteupdater|artcomm"
   attr_accessible :category, :as => [:moderator, :janitor, :contributor, :gold, :member, :anonymous, :default, :builder, :admin]
   attr_accessible :is_locked, :as => [:moderator, :janitor, :admin]
@@ -460,6 +460,10 @@ class Tag < ActiveRecord::Base
             q[:tags][:related] << "pool:#{pool_id}"
             q[:ordpool] = pool_id
 
+          when "favgroup"
+            favgroup_id = FavoriteGroup.name_to_id($2)
+            q[:favgroup] = favgroup_id
+
           when "-fav"
             q[:tags][:exclude] << "fav:#{User.name_to_id($2)}"
 

app/models/user.rb

@@ -253,6 +253,10 @@ class User < ActiveRecord::Base
     def remove_favorite!(post)
       Favorite.remove(post, self)
     end
+
+    def favorite_groups
+      FavoriteGroup.for_creator(CurrentUser.user.id)
+    end
   end
 
   module LevelMethods
@@ -541,7 +545,17 @@ class User < ActiveRecord::Base
         10_000
       end
     end
-    
+
+    def favorite_group_limit
+      if is_platinum?
+        10
+      elsif is_gold?
+        5
+      else
+        3
+      end
+    end
+
     def api_hourly_limit
       if is_platinum? && api_key.present?
         20_000
@@ -634,6 +648,10 @@ class User < ActiveRecord::Base
       Comment.for_creator(id).count
     end
 
+    def favorite_group_count
+      FavoriteGroup.for_creator(id).count
+    end
+
     def appeal_count
       PostAppeal.for_creator(id).count
     end

app/presenters/post_presenter.rb

@@ -26,6 +26,8 @@ class PostPresenter < Presenter
       tag_param = "?tags=#{CGI::escape(options[:tags])}"
     elsif options[:pool_id] || options[:pool]
       tag_param = "?pool_id=#{CGI::escape((options[:pool_id] || options[:pool].id).to_s)}"
+    elsif options[:favgroup_id] || options[:favgroup]
+      tag_param = "?favgroup_id=#{CGI::escape((options[:favgroup_id] || options[:favgroup].id).to_s)}"
     else
       tag_param = nil
     end
@@ -203,7 +205,7 @@ class PostPresenter < Presenter
   end
 
   def has_nav_links?(template)
-    (CurrentUser.user.enable_sequential_post_navigation && template.params[:tags].present? && template.params[:tags] !~ /(?:^|\s)(?:order|ordfav|ordpool):/) || @post.pools.any?
+    (CurrentUser.user.enable_sequential_post_navigation && template.params[:tags].present? && template.params[:tags] !~ /(?:^|\s)(?:order|ordfav|ordpool):/) || @post.pools.any? || @post.favorite_groups.any?
   end
 
   def post_footer_for_pool_html(template)

app/presenters/post_set_presenters/favorite_group.rb

@@ -0,0 +1,17 @@
+module PostSetPresenters
+  class FavoriteGroup < PostSetPresenters::Pool
+    def post_previews_html(template)
+      html = ""
+
+      if posts.empty?
+        return template.render("post_sets/blank")
+      end
+
+      posts.each do |post|
+        html << PostPresenter.preview(post, :favgroup_id => post_set.pool.id)
+      end
+
+      html.html_safe
+    end
+  end
+end

app/presenters/user_presenter.rb

@@ -101,6 +101,10 @@ class UserPresenter
     template.link_to(user.favorite_count, template.favorites_path(:user_id => user.id))
   end
 
+  def favorite_group_count(template)
+    template.link_to(user.favorite_group_count, template.favorite_groups_path(:search => {:creator_id => user.id}))
+  end
+
   def comment_count(template)
     template.link_to(user.comment_count, template.comments_path(:search => {:creator_id => user.id}, :group_by => "comment"))
   end

app/views/favorite_groups/_secondary_links.html.erb

@@ -0,0 +1,19 @@
+<% content_for(:secondary_links) do %>
+  <menu>
+    <li><%= link_to "Listing", favorite_groups_path %></li>
+    <% if CurrentUser.is_member? %>
+      <li><%= link_to "New", new_favorite_group_path %></li>
+    <% end %>
+    <li><%= link_to "Help", wiki_pages_path(:title => "help:favorite_groups") %></li>
+
+    <% if @favorite_group && !@favorite_group.new_record? %>
+      <li>|</li>
+      <li><%= link_to "Show", favorite_group_path(@favorite_group) %></li>
+      <li><%= link_to "Posts", posts_path(:tags => "favgroup:#{@favorite_group.id}") %></li>
+      <% if @favorite_group.editable_by?(CurrentUser.user) %>
+        <li><%= link_to "Edit", edit_favorite_group_path(@favorite_group) %></li>
+        <li><%= link_to "Delete", favorite_group_path(@favorite_group), :method => :delete, :data => {:confirm => "Are you sure you want to delete this favorite group?"} %></li>
+      <% end %>
+    <% end %>
+  </menu>
+<% end %>

app/views/favorite_groups/edit.html.erb

@@ -0,0 +1,19 @@
+<div id="c-favorite-groups">
+  <div id="a-edit">
+    <h1>Edit Favorite Group: <%= @favorite_group.pretty_name %></h1>
+
+    <%= error_messages_for "favorite_group" %>
+
+    <%= simple_form_for(@favorite_group) do |f| %>
+      <%= f.input :name, :as => :string, :input_html => { :value => @favorite_group.pretty_name } %>
+      <%= f.input :post_ids, :label => "Posts" %>
+      <%= f.button :submit, "Submit" %>
+    <% end %>
+  </div>
+</div>
+
+<%= render "secondary_links" %>
+
+<% content_for(:page_title) do %>
+  Edit Favorite Group - <%= Danbooru.config.app_name %>
+<% end %>

app/views/favorite_groups/index.html.erb

@@ -0,0 +1,40 @@
+<div id="c-favorite-groups">
+  <div id="a-index">
+    <table class="striped" width="100%">
+      <thead>
+        <tr>
+          <th width="5%"></th>
+          <th width="60%">Name</th>
+          <th width="10%">Count</th>
+        </tr>
+      </thead>
+      <tbody>
+        <% @favorite_groups.each do |favgroup| %>
+          <%= content_tag(:tr, :id => "favorite-group-#{favgroup.id}") do %>
+            <td>
+
+            </td>
+            <td>
+              <%= link_to favgroup.pretty_name, favorite_group_path(favgroup) %>
+
+              <% if favgroup.post_count > CurrentUser.user.per_page %>
+                <%= link_to "page #{favgroup.last_page}", favorite_group_path(favgroup, :page => favgroup.last_page), :class => "last-page" %>
+              <% end %>
+            </td>
+            <td>
+              <%= favgroup.post_count %>
+            </td>
+          <% end %>
+        <% end %>
+      </tbody>
+    </table>
+
+    <%= numbered_paginator(@favorite_groups) %>
+
+    <%= render "secondary_links" %>
+  </div>
+</div>
+
+<% content_for(:page_title) do %>
+  Favorite Groups - <%= Danbooru.config.app_name %>
+<% end %>

app/views/favorite_groups/new.html.erb

@@ -0,0 +1,19 @@
+<div id="c-favorite-groups">
+  <div id="a-new">
+    <h1>New Favorite Group</h1>
+
+    <%= error_messages_for "favorite_group" %>
+
+    <%= simple_form_for(@favorite_group) do |f| %>
+      <%= f.input :name, :as => :string, :required => true %>
+      <%= f.input :post_ids, :label => "Posts" %>
+      <%= f.button :submit, "Submit" %>
+    <% end %>
+  </div>
+</div>
+
+<%= render "secondary_links" %>
+
+<% content_for(:page_title) do %>
+  New Favorite Group - <%= Danbooru.config.app_name %>
+<% end %>

app/views/favorite_groups/show.html.erb

@@ -0,0 +1,22 @@
+<div id="c-favorite-groups">
+  <div id="a-show">
+    <h1>
+      Favorite Group:
+      <%= link_to @favorite_group.pretty_name, posts_path(:tags => "favgroup:#{@favorite_group.id}") %>
+    </h1>
+
+    <%= render "posts/partials/common/inline_blacklist" %>
+
+    <section>
+      <%= @post_set.presenter.post_previews_html(self) %>
+
+      <%= numbered_paginator(@post_set) %>
+    </section>
+  </div>
+</div>
+
+<%= render "secondary_links" %>
+
+<% content_for(:page_title) do %>
+  Favorite Group - <%= @favorite_group.pretty_name %> - <%= Danbooru.config.app_name %>
+<% end %>

app/views/posts/partials/common/_secondary_links.html.erb

@@ -6,6 +6,7 @@
     <li><%= link_to "Hot", posts_path(:tags => "order:rank") %></li>
     <% unless CurrentUser.is_anonymous? %>
       <li><%= link_to "Favorites", favorites_path %></li>
+      <li><%= link_to "Favorite groups", favorite_groups_path %></li>
       <% if CurrentUser.user.has_saved_searches? %>
         <li><%= link_to "Saved searches", saved_searches_path %></li>
       <% end %>

app/views/posts/partials/show/_favorite_groups.html.erb

@@ -0,0 +1,23 @@
+<div id="favgroup-nav">
+  <ul>
+    <% post.favorite_groups.each do |favgroup| %>
+      <li>
+        <% if favgroup.neighbors(post).previous %>
+          <%= link_to("&lsaquo;&thinsp;prev".html_safe, post_path(favgroup.neighbors(post).previous), :rel => "prev", :class => "prev") %>
+        <% else %>
+          <span class="prev">&lsaquo;&thinsp;prev</span>
+        <% end %>
+
+        <span class="favgroup-name">
+          <%= link_to("Favorite group: #{favgroup.name}", favorite_group_path(favgroup)) %>
+        </span>
+
+        <% if favgroup.neighbors(post).next %>
+          <%= link_to("next&thinsp;&rsaquo;".html_safe, post_path(favgroup.neighbors(post).next), :rel => "next", :class => "next") %>
+        <% else %>
+          <span class="next">next&thinsp;&rsaquo;</span>
+        <% end %>
+      </li>
+    <% end %>
+  </ul>
+</div>

app/views/posts/partials/show/_nav_links.html.erb

@@ -7,5 +7,9 @@
     <% if post.pools.any? %>
       <%= render "posts/partials/show/pools", :post => post %>
     <% end %>
+
+    <% if post.favorite_groups.any? %>
+      <%= render "posts/partials/show/favorite_groups", :post => post %>
+    <% end %>
   </div>
 <% end %>

app/views/users/_statistics.html.erb

@@ -44,6 +44,11 @@
         <td><%= presenter.favorite_count(self) %></td>
       </tr>
 
+      <tr>
+        <th>Favorite Groups</th>
+        <td><%= presenter.favorite_group_count(self) %></td>
+      </tr>
+
       <tr>
         <th>Post Changes</th>
         <td><%= presenter.post_version_count(self) %></td>