r1888, r1904: "fixed artist/show" which we don't need but brings in Post.find_by_tag_join

and affects wiki and pool, too

--HG--
branch : moe
extra : convert_revision : svn%3A2d28d66d-8d94-df11-8c86-00306ef368cb/trunk/moe%40287

app/models/post/sql_methods.rb

@@ -1,5 +1,10 @@
 module PostSqlMethods
   module ClassMethods
+    def find_by_tag_join(tag, options = {})
+      tag = tag.downcase.tr(" ", "_")
+      find(:all, :conditions => ["tags.name = ?", tag], :select => "posts.*", :joins => "JOIN posts_tags ON posts_tags.post_id = posts.id JOIN tags ON tags.id = posts_tags.tag_id", :limit => options[:limit], :offset => options[:offset], :order => (options[:order] || "posts.id DESC"))
+    end
+    
     def generate_sql_range_helper(arr, field, c, p)
       case arr[0]
       when :eq