dry-types master

Constraints

You can create constrained types that will use validation rules to check that the input is not violating any of the configured constraints. You can treat it as a lower level guarantee that you're not instantiating objects that are broken.

All types support the constraints API, but not all constraints are suitable for a particular primitive, it's up to you to set up constraints that make sense.

Under the hood it uses dry-logic and all of its predicates are supported.

string = Types::String.constrained(min_size: 3)

string['foo']
# => "foo"

string['fo']
# => Dry::Types::ConstraintError: "fo" violates constraints

email = Types::String.constrained(
  format: /\A[\w+\-.]+@[a-z\d\-]+(\.[a-z]+)*\.[a-z]+\z/i
)

email["jane@doe.org"]
# => "jane@doe.org"

email["jane"]
# => Dry::Types::ConstraintError: "jane" violates constraints

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