Use size constraint with Integer in Grails

Question

The reference doc says that the size constraint: "Uses a Groovy range to restrict the size of a collection or number or the length of a String."

When I put a size constraint on an integer, I get a warning "Property [prop] of domain class TheClass has type [java.lang.Integer] and doesn't support constraint [size]. This constraint will not be checked during validation."

Is the doco wrong?

I know I could use range but it would generally be easier to be able to specify the amount of digits in the number rather than the actual value (like a social security number must have 7 digits or whatever it is, rather than making a range of 1000000 - 9999999).

Answer 1

If you want the number of digits, make sure it's positive and has a certain length:

myInteger( validator: {
   return it > 0 &&  (it.toString.length) == 7
})

Answer 2

You can also use max to constrain an integer like myIntProp(max:9999999)

Answer 3

I found the answer whilst searching JIRA: http://jira.codehaus.org/browse/GRAILS-947. The doco is wrong. Looks like it's up to the custom validator.