validates_amount .. is there any??

rubyonrails-talk
1

Is there any plugin which validates amount?? say the amount entered should be greater than 0.

Thanks =]

2

#### Taken From Agile Web Development With Rails, 2nd Ed. p.369 ####

validates_length_of

Validates that the length of the value of each of the attributes meets some constraint: at least a given length, at most a given length, between two lengths, or exactly a given length. Rather than having a single :message option, this validator allows separate mes- sages for dif ferent validation failures, although :message may still be used. In all options, the lengths may not be negative.

## EXAMPLES ##

validates_length_of :name, :maximum => 50 validates_length_of :password, :in => 6..20 validates_length_of :address, :minimum => 10, :message => "seems too short" end

3

validates_lenght_of is meant for strings, it can behave unexpected when used on integer attributes as it uses byte comparison ...

4

This is covered in the agile book. You need to write your own validation.

def validate

errors.add :price, “must be greater than 0” unless self.price > 0

end

That’s a quickie off the top of my head. You may want to only do that check if the value is filled in (self.price.blank?). That’s up to you.

5

I must not have read his post carefully enough.

6

Thanks. this helps =]