Rails : Validates_format_of for float not working

Question

I am new at Ruby on Rails. I was trying to validate format of one of the attribute to enter only float.

validates :price, :format => { :with => /^[0-9]{1,5}((\.[0-9]{1,5})?)$/, :message => "should be float" }

but when I enter only character in price, it accepts it and show 0.0 value for price. can anybody tell, what is wrong in this or why this happens?

Answer 1

This is my solution,

validates :price,presence:true, numericality: {only_float: true}

when you fill in for example 7 it automatically transfer the value to 7.0

Answer 2

For rails 3:

validates :price, :format => { :with => /^\d+??(?:\.\d{0,2})?$/ }, 
:numericality =>{:greater_than => 0}