Error handling comparisons

gistfile1.txt

def SomeController < ApplicationController
  def some_action_1
    line_item = LineItem.find(params[:line_item_id])
  
    user_qty = Integer(params[:user_qty]) rescue nil
    unless user_qty && (1...line_item.quantity) === user_qty
      render partial: '/my/error/partial'
      return
    end
  
    # do some stuff
  
    render partial: '/my/main/partial'
  end

  def some_action_2
    line_item = LineItem.find(params[:line_item_id])
  
    user_qty = Integer(params[:user_qty])
    raise ArgumentError unless (1...line_item.quantity) === user_qty

    # do some stuff
  
    render partial: '/my/main/partial'

  rescue ArgumentError
    render partial: '/my/error/partial'
  end
end