Merge branch 'tag-cloud' of https://github.com/kytrinyx/tracks

app/models/stats/tag_cloud.rb

@@ -0,0 +1,38 @@
+# tag cloud code inspired by this article
+#  http://www.juixe.com/techknow/index.php/2006/07/15/acts-as-taggable-tag-cloud/
+module Stats
+  class TagCloud
+
+    attr_reader :levels, :tags
+    def initialize(tags)
+      @levels = 10
+      @tags = tags.sort_by { |tag| tag.name.downcase }
+    end
+
+    def empty?
+      tags.empty?
+    end
+
+    def font_size(tag)
+      (9 + 2*(tag.count-min)/divisor)
+    end
+
+    private
+
+    def max
+      @max ||= counts.max
+    end
+
+    def min
+      @min ||= counts.min
+    end
+
+    def divisor
+      @divisor ||= ((max - min) / levels) + 1
+    end
+
+    def counts
+      @counts ||= tags.map {|t| t.count}
+    end
+  end
+end

app/models/stats/tag_cloud_query.rb

@@ -0,0 +1,38 @@
+module Stats
+  class TagCloudQuery
+
+    attr_reader :user, :cutoff
+    def initialize(user, cutoff = nil)
+      @user = user
+      @cutoff = cutoff
+    end
+
+    def result
+      Tag.find_by_sql(query_options)
+    end
+
+    def query_options
+      options = [sql, user.id]
+      options += [cutoff, cutoff] if cutoff
+      options
+    end
+
+    def sql
+      # TODO: parameterize limit
+      query = "SELECT tags.id, tags.name AS name, count(*) AS count"
+      query << " FROM taggings, tags, todos"
+      query << " WHERE tags.id = tag_id"
+      query << " AND todos.user_id=? "
+      query << " AND taggings.taggable_type='Todo' "
+      query << " AND taggings.taggable_id=todos.id "
+      if cutoff
+        query << " AND (todos.created_at > ? OR "
+        query << "      todos.completed_at > ?) "
+      end
+      query << " GROUP BY tags.id, tags.name"
+      query << " ORDER BY count DESC, name"
+      query << " LIMIT 100"
+    end
+
+  end
+end