add index for feed

app/models/site_feed_annc.rb

@@ -12,6 +12,11 @@ class SiteFeedAnnc
   field :merge_with_category
   field :remote_site_url
   field :channel_title
+  I18n.available_locales.each do |locale|
+    index({ "all_contents_for_feed.#{locale}.is_hidden"=> -1,
+            "all_contents_for_feed.#{locale}.is_top"=> -1,
+            "all_contents_for_feed.#{locale}.postdate"=> -1}, { unique: false, background: true })
+  end
   def get_annc(annc_uid)
     Array(self[:all_contents_for_feed]).select{|v| v['id']==annc_uid}[0] rescue {}
   end
@@ -164,12 +169,12 @@ class SiteFeedAnnc
       {"$match"=>match_cond},
       {"$project"=>{"data"=>"$all_contents_for_feed.#{locale}"}},
       {"$unwind"=>"$data"},
+      {"$sort"=>{"data.is_hidden"=>-1,"data.is_top"=>-1,"data.postdate"=>-1}},
       {"$match"=>{"data.is_hidden"=>{"$ne"=>true},
                   "data.postdate"=>{"$lte"=>Time.now},
                   "data.title" => {"$gt"=>""}
               }
-      },
+      }
-      {"$sort"=>{"data.is_top"=>-1,"data.postdate"=>-1}}
     ]
     if max_len
       pipeline << {"$limit"=> max_len}

app/models/site_feed_annc_cache.rb

@@ -0,0 +1,7 @@
+class SiteFeedAnncCache
+  include Mongoid::Document
+  field :data
+  field :subpart_id
+  field :invalid_time
+
+end

lib/feeds/engine.rb

@@ -34,6 +34,7 @@ module Feeds
                 tmp.destroy
               end
             end
+            SiteFeedAnnc.create_indexes
           end
         rescue  => e
           puts ['feed_engine',e]