Module: ActsAsDecimal::ClassMethods

Defined in:
lib/acts_as_decimal/acts_as_decimal.rb

Instance Method Summary collapse

Instance Method Details

#acts_as_decimal(attr_name, options = {:decimals => 2}) ⇒ Object

Implements integer handling as floating numbers. Usage:

Inside a model with a price or amount field, simply put

acts_as_decimal field_name, :decimals => 2



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# File 'lib/acts_as_decimal/acts_as_decimal.rb', line 19

def acts_as_decimal(attr_name, options = {:decimals => 2})
  fields = [attr_name] unless attr_name.is_a? Array
  fields.each do |field|
    define_method "human_#{field}" do |*human_options|
      ActiveSupport::Deprecation.warn("acts_as_decimal: The human helper has been deprecated. Please use #{field}.number_with_precision, directly in your views. More info: http://api.rubyonrails.org/classes/ActionView/Helpers/NumberHelper.html#method-i-number_with_precision")

      human_options = human_options.first || {:thousand_delimiters => true}
      return number_with_precision(self.send(field), :delimiter => (human_options[:thousand_delimiters] ? '.' : ''), :separator => ',', :precision => 2)   
    end

    define_method "#{field}" do
      if value = read_attribute("#{field}")
        value / BigDecimal('10').power("#{options[:decimals]}".to_i).to_f
      end
    end

    define_method "#{field}=" do |decimalnum|
      value = unless decimalnum.nil?
        (BigDecimal.new(decimalnum.to_s) * BigDecimal('10').power("#{options[:decimals]}".to_i)).to_i
      end
      write_attribute("#{field}", value || nil)
    end

    define_method "#{field}_raw" do
      read_attribute("#{field}")
    end

    define_method "#{field}_raw=" do |value|
      write_attribute("#{field}", value)
    end
  end
end