class Incoming < ActiveRecord::Base
  belongs_to :asset
  belongs_to :category
  has_one    :balance, :dependent => :delete
  
  # Returns base_amount / 100.0.
  def amount
    base_amount / 100.0
  end
  
  # Checks that the specified amount is numeric and sets base_amount to the
  # specified amount * 100 if it is.
  def amount=(new_amount)
    Float(new_amount) # Raises ArgumentError if not numeric.
    self.base_amount = (new_amount.to_f * 100).round
  end
  
  protected
  
  # Validates that base_amount is not nil and greater than 0.
  def validate
    errors.add(:amount, 'can\'t be zero.') if base_amount.nil? ||
      base_amount < 0.01
  end
end