major refactoring of post sets and pagination, incomplete

app/logical/post_sets/post.rb

@@ -1,78 +1,56 @@
 module PostSets
-  class Post < Base
+  module Post
     class Error < Exception ; end
   
-    attr_accessor :tags, :errors, :count
-    attr_accessor :wiki_page, :artist, :suggestions
-  
-    def initialize(tags, options = {})
-      super(options)
-      @tags = Tag.normalize(tags)
-      @errors = []
-      load_associations
-      load_suggestions
-      validate
+    attr_accessor :tags, :count, :wiki_page, :artist, :suggestions
+    
+    def tags
+      @tags ||= Tag.normalize(params[:tags])
+    end
+    
+    def count
+      @count ||= ::Post.fast_count(tag_string)
+    end
+    
+    def posts
+      @posts ||= slice(::Post.tag_match(tags).limit(limit))
+    end
+
+    def reload
+      super
+      @tags = nil
+      @tag_string = nil
+      @count = nil
+      @wiki_page = nil
+      @artist = nil
+    end
+    
+    def wiki_page
+      @wiki_page ||= ::WikiPage.titled(tag_string).first
+    end
+    
+    def artist
+      @artist ||= ::Artist.find_by_name(tag_string)
     end
     
     def has_wiki?
       is_single_tag?
     end
     
-    def has_errors?
-      errors.any?
-    end
-  
-    def offset
-      x = (page - 1) * limit
-      if x < 0
-        x = 0
-      end
-      x
-    end
-  
     def is_single_tag?
       tag_array.size == 1
     end
-  
-    def date_tag
-      tag_array.grep(/date:/).first
-    end
-  
-    def load_associations
-      if is_single_tag?
-        @wiki_page = ::WikiPage.titled(tags).first
-        @artist = ::Artist.find_by_name(tags)
-      end
-    end
-  
-    def load_posts
-      @count = ::Post.fast_count(tags)
-      @posts = ::Post.tag_match(tags).before_id(before_id).all(:order => "posts.id desc", :limit => limit, :offset => offset)
-    end
-  
-    def load_suggestions
-      if count < limit && is_single_tag?
-        @suggestions = Tag.find_suggestions(tags)
-      else
-        @suggestions = []
-      end
-    end
-  
+    
     def tag_array
       @tag_array ||= Tag.scan_query(tags)
     end
     
-    def tag
-      tag_array.first
-    end
-  
     def validate
+      super
       validate_page
       validate_query_count
-    rescue Error => x
-      @errors << x.to_s
     end
-  
+    
     def validate_page
       if page > 1_000
         raise Error.new("You cannot explicitly specify the page after page 1000")