Question

Environment: Grails 2.0.4, Java 1.6.0

I’d like to put a constraint on a Domain Object value requiring an integer value to prevent a decimal value from being entered. Entering 3.3 in the view results in the object being created with a value of 3. I was hoping for a validation error that would be kicked back to the user indicating only integer values are valid.

class ADomainObject {
    Integer    anInteger
}

Controller

def save() {
   // Note: params["anInteger"] = "3.3"

   ADomainObject aDomainObject = new ADomainObject(params)
   aDomainObject.save flush:true
}

Result in the persistence of aDomainObject.anInteger = 3

What type of constraint would be needed to cause a failure? I’ve tried using a range constraint, [0..1000], to no avail.

Answer 1

You can register a custom property editor for Integers to only allow strictly Integer values. The following will apply to binding all Integers.

class IntegerEditor extends java.beans.PropertyEditorSupport {
    void setAsText(String text) {
        value = Integer.parseInt(text)
    }
}

class CustomPropertyEditorRegistrar implements org.springframework.beans.PropertyEditorRegistrar {
    void registerCustomEditors(org.springframework.beans.PropertyEditorRegistry registry) {
        registry.registerCustomEditor(Integer, new IntegerEditor())
    }
}

and then in resources.groovy:

beans = {
    customPropertyEditorRegistrar(CustomPropertyEditorRegistrar)
}