todos_controller.rb

class Dashboard::TodosController < Dashboard::ApplicationController
  include TodosHelper

  before_action :find_todos, only: [:index, :destroy_all]

  def index
    @todos = @todos.page(params[:page])
  end

  def destroy
    TodoService.new.mark_todos_as_done([todo], current_user)

    respond_to do |format|
      format.html { redirect_to dashboard_todos_path, notice: 'Todo was successfully marked as done.' }
      format.js { head :ok }
      format.json { render json: { count: todos_pending_count, done_count: todos_done_count } }
    end
  end

  def destroy_all
    TodoService.new.mark_todos_as_done(@todos, current_user)

    respond_to do |format|
      format.html { redirect_to dashboard_todos_path, notice: 'All todos were marked as done.' }
      format.js { head :ok }
      format.json { render json: { count: todos_pending_count, done_count: todos_done_count } }
    end
  end

  private

  def todo
    @todo ||= find_todos.find(params[:id])
  end

  def find_todos
    @todos ||= TodosFinder.new(current_user, params).execute
  end
end