Custom Predicates
You can simply define predicate methods on your schema object:
schema = Dry::Validation.Schema do
configure do
def email?(value)
! /magical-regex-that-matches-emails/.match(value).nil?
end
end
required(:email).filled(:str?, :email?)
end
You can also re-use a predicate container across multiple schemas:
module MyPredicates
include Dry::Logic::Predicates
predicate(:email?) do |value|
! /magical-regex-that-matches-emails/.match(value).nil?
end
end
schema = Dry::Validation.Schema do
configure do
predicates(MyPredicates)
end
required(:email).filled(:str?, :email?)
end
You need to provide error messages for your custom predicates if you want them to work with Schema#call(input).messages interface.
You can learn how to do that in the Error Messages section.