Fix error for get_feed_cache

app/models/site_feed_annc.rb

@@ -307,17 +307,22 @@ class SiteFeedAnnc
       if feeds_time_field.nil?
         feeds_time_field = 'postdate'
       end
-      match_cond = {"channel_key"=>channel_key}
+      site_feed_anncs = self.where("channel_key" => channel_key)
       if !merge_with_category.blank? && merge_with_category.exclude?('all')
-        match_cond["merge_with_category"] = {"$in"=>merge_with_category}
+        site_feed_anncs = site_feed_anncs.where(:merge_with_category.in => merge_with_category)
       end
       if site_source
-        match_cond["channel_title.#{locale}"] = site_source
+        site_feed_anncs = site_feed_anncs.where({"channel_title.#{locale}" => site_source})
       end
+      site_feed_annc_ids = site_feed_anncs.pluck(:id)
+      match_cond = {
+        "site_feed_annc_id" => {"$in" => site_feed_annc_ids},
+        "locale" => locale
+      }
+
       pipeline = [
-        {"$match"=>match_cond},
-        {"$project"=>{"data"=>"$all_contents_for_feed.#{locale}"}},
-        {"$unwind"=>"$data"},
+        {"$match" => match_cond},
+        {"$project"=>{"data"=>1}},
         {"$sort"=>{"data.is_hidden"=>-1,"data.is_top"=>-1,"data.#{feeds_time_field}"=>-1}},
         {"$match"=>{"data.is_hidden"=>{"$ne"=>true},
                     "data.postdate"=>{"$lte"=>Time.now},
@@ -328,7 +333,8 @@ class SiteFeedAnnc
       if max_len
         pipeline << {"$limit"=> max_len}
       end
-      self.collection.aggregate(pipeline).collect do |data|
+
+      SiteFeedAnncDetail.collection.aggregate(pipeline).collect do |data|
         tmp = data['data']
         if !(tmp['category'].is_a? String)
           tmp['category'] = tmp['category'][locale]