Monads
The monads extension makes Dry::Schema::Result objects compatible with dry-monads.
To enable the extension:
require 'dry/schema'
Dry::Schema.load_extensions(:monads)
After loading the extension, you can leverage monad API:
schema = Dry::Schema.Params { required(:name).filled(:str?, size?: 2..4) }
schema.call(name: 'Jane').to_monad # => Dry::Monads::Success(#<Dry::Schema::Result{:name=>"Jane"} errors={}>)
schema.call(name: '').to_monad # => Dry::Monads::Failure(#<Dry::Schema::Result{:name=>""} errors={:name=>["must be filled"]}>)
schema.(name: "")
.to_monad
.fmap { |r| puts "passed: #{r.to_h.inspect}" }
.or { |r| puts "failed: #{r.errors.to_h.inspect}" }
This can be useful when used with dry-monads and the do notation.