Remove unnecessary helper method

app/helpers/boards_helper.rb

@@ -20,12 +20,6 @@ module BoardsHelper
     project_issues_path(@project)
   end
-  def current_board_json
-    board.to_json(
-      only: [:id, :name, :milestone_id]
-    )
-  end
-
   def board_base_url
     project_boards_path(@project)
   end