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Rails : Validates_format_of for float not working
validates :price, :format => { :with => /^[0-9]{1,5}((.[0-9]{1,5})?)$/, :message => "should be float" }

attr_accessor :price_string

before_save :convert_price_string

protected
  def convert_price_string
    if price_string
      begin
        self.price = Kernel.Float(price_string)
      rescue ArgumentError, TypeError
        errors.add(ActiveRecord::Errors.default_error_messages[:not_a_number])
      end
    end