How do I know if a BigDecimal failed to parse?

Question

Hi guys,

I'm importing data from a csv, I need to cast some values to BigDecimal, and raise an error if they can't be parsed..

From testing, BigDecimal("invalid number") returns a BigDecimal of 0. This would be ok, but kind of messy, except a valid value is 0...

Float("invalid number") acts differently and throws an exception...

My current solution is:

class String
  def to_bd
    begin
      Float(self)
    rescue
      raise "Unable to parse: #{self}"
    end
    BigDecimal(self)
  end
end

Am I totally missing something?

Answer 1

in simple case you can use RegExp

'123.4' =~ /^[+-]{0,1}\d+\.{0,1}\d*$/
=> 0