Allow global configuration for dry-validation

[gorkunov]

Current dry-v version allows global configuration (useful for custom predicates and messages settings):

Dry::Validation::Schema.configure do |config|
  config.messages = :i18n
  config.predicates = MyPredicates
end

Currently there is no way to handle this in reform and we need manually configure each validation block in form.
It would be much useful to set this configuration only once in global reform config.

Related discussion #377

[fran-worley]

As of Reform 2.3 you will be able to either monkey patch reforms base schema (https://github.com/apotonick/reform/blob/master/lib/reform/form/dry.rb#L26) or pass your own into a validation block see this test for an example:
https://github.com/apotonick/reform/blob/master/test/validation/dry_validation_test.rb#L137

[siassaj]

Dry::Validation::Schema::Form.configure do |config|
  config.messages = :i18n
end

[fran-worley]

That is handy to know, I assumed you had to define a base class as per their docs:
http://dry-rb.org/gems/dry-validation/basics/working-with-schemas/

[siassaj]

wow. I just googled 'configure dry validations globally' and found my own answer ...

[micdahl]

@fran-worley (or someone else)
Could you please explain, how concrete to get i18n running? I have tried different methods which did not lead to a satisfying result (see reform-rails issue)