Extending a validation schema

Support dry-validation
3

There are several ways to inherit schema without necessarily writing the class.

The key to the first one is the build option in the Dry::Validation.Schema method:

S1 = Dry::Validation.Schema(build: false) do
  required(:name).filled
end

S2 = Dry::Validation.Params(S1) do
  required(:age).filled(:int?, gt?: 0)
end

Be warned, however, that S1 in this case would be the class of the schema, not the schema itself. So instead of doing this:

S1.({name: 'William'})

You will have to do this:

S1.new.({name: 'William'})

The second option is just use the parent schema’s class in the child schema:

S1 = Dry::Validation.Schema do
  required(:name).filled
end

S2 = Dry::Validation.Params(S1.class) do
  required(:age).filled(:int?, gt?: 0)
end
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