Extract duplicate context query from controller

app/models/stats/top_contexts_query.rb

@@ -0,0 +1,34 @@
+# Get action count for the top 5 contexts
+# If initialized with :running, then only active
+# and visible contexts will be included.
+module Stats
+  class TopContextsQuery
+
+    attr_reader :user, :running
+    def initialize(user, running = nil)
+      @user = user
+      @running = running == :running
+    end
+
+    def result
+      user.contexts.find_by_sql([sql, user.id])
+    end
+
+    private
+
+    def sql
+      query = "SELECT c.id AS id, c.name AS name, count(c.id) AS total "
+      query << "FROM contexts c, todos t "
+      query << "WHERE t.context_id=c.id "
+      query << "AND t.user_id = ? "
+      if running
+        query << "AND t.completed_at IS NULL "
+        query << "AND NOT c.state='hidden' "
+      end
+      query << "GROUP BY c.id, c.name "
+      query << "ORDER BY total DESC "
+      query << "LIMIT 5"
+    end
+
+  end
+end