Generate Unique ID

Here is a very simple way to generate a unique id.
[Background support : Abhishek S.]

def generate_unique_id( len )
    chars_pattern = ("a".."z").to_a + ("A".."Z").to_a + ("0".."9").to_a 
    unique_id = ""
    1.upto(len) { 
			|i| unique_id << chars_pattern[rand(chars_pattern.size-1)]  }
    return unique_id    
end
#generates a key of length 10
mykey = generate_unique_id(10)
print mykey # gives a result like "qeKX0myIQh"