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 doc 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

I found the answer whilst searching JIRA: http://jira.codehaus.org/browse/GRAILS-947. The doc is wrong.

We don't need minSize, maxSize and size constraints for numeric fields anymore since this functionality is on min, max and range constraints respective. So we marking these constraints (for numeric fields only) as deprecated in 0.5 and will remove it in 0.6.

Looks like it's up to the custom validator.

Answer 3

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