#1938: Add random post link

app/controllers/posts_controller.rb

@@ -112,6 +112,12 @@ class PostsController < ApplicationController
     end
   end
 
+  def random
+    count = Post.fast_count(params[:tags])
+    @post = Post.tag_match(params[:tags]).offset(rand(count)).first
+    redirect_to post_path(@post, :tags => params[:tags])
+  end
+
 private
   def tag_query
     params[:tags] || (params[:post] && params[:post][:tags])

app/views/posts/partials/index/_related.html.erb

@@ -8,5 +8,7 @@
     <% if @post_set.is_tag_subscription? %>
       <li><%= link_to "Edit subscriptions", tag_subscriptions_path %></li>
     <% end %>
+
+    <li><%= link_to "Random post", random_posts_path(:tags => params[:tags]) %></li>
   </ul>
 </section>

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

@@ -3,6 +3,7 @@
   <li><%= link_to "Favorite", favorites_path(:post_id => post.id), :remote => true, :method => :post, :id => "add-to-favorites", :title => "Shortcut is F" %></li>
   <li><%= link_to "Unfavorite", favorite_path(post), :remote => true, :method => :delete, :id => "remove-from-favorites" %></li>
   <li><%= link_to "Edit", "#", :id => "side-edit-link" %></li>
+  <li><%= link_to "Random post", random_posts_path(:tags => params[:tags]) %></li>
   <li><%= link_to "Add to pool", "#", :id => "pool" %></li>
   <% if post.is_note_locked? %>
     <li><span id="note-locked-notice">Note locked</span></li>

config/routes.rb

@@ -156,6 +156,7 @@ Danbooru::Application.routes.draw do
     resources :votes, :controller => "post_votes", :only => [:create, :destroy]
     collection do
       get :home
+      get :random
     end
     member do
       put :revert