Grails 默认的可为空约束

Question

In my Grails app I have the following command object

@Validateable
class CalendarEventCommand {

    @BindingFormat('FestivalType')
    Collection<FestivalType> types
    Date start
    Date end
    MapFocalPoint location
    boolean freeOnly = false
}

which is used as the argument to a controller action

def getCalendarEvents(CalendarEventCommand calendarEventCommand) {
    if (calendarEventCommand.validate()) {
       log.error "Command errors $calendarEventCommand.errors"

    } else {
       log.warn "Everything is fine"
    }
}

In Config.groovy I've specified the following as the default constraints

grails.gorm.default.constraints = {

    // apply a max size of 191 chars to String columns to support utf8mb4
    // http://mathiasbynens.be/notes/mysql-utf8mb4
    '*'(maxSize: 191)

    // this shared constraint provides a way to override the default above for long text properties
    unlimitedSize(maxSize: Integer.MAX_VALUE)
}

If an instance is created with a null value for start and end validation passes, but I wouldn't expect it to because AFAIK a default constraint of nullable: false should be applied to all properties. I've tried adding this explicitly, by changing the first default constraint to

'*'(maxSize: 191, nullable: false)

But validate() still returns true when start and/or end are null. If I add these constraints to CalendarEventCommand

static constraints = {
    start nullable: false
    end nullable: false
}

then validate() returns false , but AFAIK it shouldn't be necessary for me to add these constraints.

Answer 1

I think this is an expected behavior. There are couple of JIRA defects regarding this functionality out of which GRAILS-7431 and GRAILS-8583 seems more focused towards the behavior.

I was going through DefaultConstraintEvaluator.java which takes care of global constraints only for domain classes. I think we have to end up using the way mentioned later.

static constraints = {
    start nullable: false
    end nullable: false
}