#434

backend/app/services/counts_query.rb

@@ -14,11 +14,12 @@ class CountsQuery
 
   attr_reader :page, :limit, :mode, :axis
 
-  def initialize(scope, resource, params)
+  def initialize(scope, resource, params, latest_expression: nil)
     @table = scope.klass.table_name
     @resource = resource
     @id_column = resource == 'posts' ? 'post_id' : 'tag_id'
     @params = params
+    @latest_expression = latest_expression
     @scope = scope.except(:select, :order).joins(
         "LEFT JOIN users counts_actor ON counts_actor.id = #{ @table }.created_by_user_id")
     raise ArgumentError unless (params.keys - KEYS).empty?
@@ -43,6 +44,8 @@ class CountsQuery
   def count = @scope.count
 
   def latest_expression
+    return @latest_expression if @latest_expression
+
     <<~SQL.squish
       NOT EXISTS (SELECT 1 FROM #{ @table } newer
         WHERE newer.#{ @id_column } = #{ @table }.#{ @id_column }