Minimum length for a String property in DataMapper

Question

Im using DataMapper in my Sinatra application.I defined a property called 'to' whose minimum length i want to be 10

property :to,String,:required => true,:min => 10  

This causes my application to crash with the error

assert_valid_options': options :min are unknown (ArgumentError)

Am i specifying the min length in the right way ?

Thank You

Answer 1

Try

validates_length_of :to, :min => 10

If you know the maximum length of your string, you can do

property :to,String,:required => true,:min => 10 ,:length => 10..20  #length must be between 10 to 20 char