accelerate speed

app/views/admin/event_news/export_excel.xlsx.axlsx

@@ -13,7 +13,8 @@ wb.add_worksheet(name: "EventNewsModule") do |sheet|
   row << t("category")
   row1 << "select"
   t = ""
-  categories = @module_app.categories.asc(:created_at)
+  categories = @module_app.categories.asc(:created_at).to_a
+  categories_ids_map = categories.to_enum.with_index.map{|v,i| [v.id,i]}.to_h
   categories.each_with_index do |cat,i|
       t = t + "#{i}" + " -> " + cat.title + ", " 
   end
@@ -27,7 +28,8 @@ wb.add_worksheet(name: "EventNewsModule") do |sheet|
   row << t("tags")
   row1 << "select"
   t = ""
-  tags = @module_app.tags.asc(:created_at)
+  tags = @module_app.tags.asc(:created_at).to_a
+  tag_ids_map = tags.to_enum.with_index.map{|v,i| [v.id,i]}.to_h
   tags.each_with_index do |tag,i|
       t = t + "#{i}" + " -> " + tag.name + ", " 
   end
@@ -165,13 +167,15 @@ wb.add_worksheet(name: "EventNewsModule") do |sheet|
   sheet.add_row row, :style => heading
   sheet.add_row row1
   sheet.add_row row2, :style => example
-
+  tag_anns_map = Tagging.collection.aggregate([
+    {"$match" => {"taggable_id"=>{"$in"=>@event_news.pluck(:id)}}},
+    {"$group" => {"_id"=>"$taggable_id","children"=>{"$push"=>"$tag_id"}}}
+    ]).map{|v| [v['_id'],v['children']]}.to_h
   @event_news.each do |anns|
     row = []
-    row << categories.to_a.index(anns.category)
-    t = []
-    anns.tags.each do |tag|
-      t << tags.to_a.index(tag)
+    row << categories_ids_map[anns.category_id]
+    t = Array(tag_anns_map[anns.id]).map do |tag_id|
+      tag_ids_map[tag_id]
     end
     row << t.join(",")
     row << (anns.event_date.strftime("%Y/%m/%d %H:%M") rescue "")