fixed post listing

app/logical/post_sets/post.rb

@@ -0,0 +1,43 @@
+module PostSets
+  class Post
+    attr_reader :tags, :page, :posts
+    
+    def initialize(params)
+      @tags = Tag.scan_query(params[:tags])
+      @page = [params[:page].to_i, 1].max
+      @posts = ::Post.tag_match(tag_string).paginate(page)
+    end
+    
+    def tag_string
+      @tag_string ||= tags.join(" ")
+    end
+    
+    def has_wiki?
+      if tags.any?
+        ::WikiPage.titled(tag_string).exists?
+      else
+        false
+      end
+    end
+    
+    def wiki_page
+      if tags.any?
+        ::WikiPage.titled(tag_string).first
+      else
+        nil
+      end
+    end
+    
+    def is_single_tag?
+      tags.size == 1
+    end
+    
+    def tag
+      tag_string
+    end
+    
+    def presenter
+      @presenter ||= PostSetPresenter.new(self)
+    end
+  end
+end