notNull

Validates that the optional value is not null.

This function creates a validation rule that checks if a nullable value is not null. The null check is applied immediately when this function is called, making the then call optional. It returns a ValidationRuleChainer that allows you to chain additional validation rules using the then infix function. The chained rules will only be applied if the value is not null.

Usage:

// Basic null check only
rules<String?> {
    notNull { "Value is required" }
}

// Null check with additional validation
rules<String?> {
    notNull { "Value is required" } then {
        notBlank { "Value cannot be blank" }
        minLength(3) { "Value must be at least 3 characters" }
    }
}

Parameters