Rails before_filter with parameter from methods

I have a series of methods, with similar structure and sharing a common parameter:

def deposit (amount)
def transfer (amount, to)
def refund (amount)

I would like to check if the balance is greater than amount before calling these actions. Otherwise, I have to repeat check_balance in every method

Is there a way I can user before_filter to call check_balance(amount) with amount passed from the methods I want to apply to?

Thank you.

Solution

It seems you're not really looking for some before_filter since you want to pass arguments (unless arguments are taken directly from params but then the syntax would be wrong).

You should create a new method in you controller

private
def check_balance amount
  # whatever you need
end

An call this as you need in your action

def index
  #some code
  check_balance(current_amount)
  #other code
end

But you're sure this kind of code isn't related directly to the model? If so, it should be refactored inside the model itself.