Option to yield rather than instance_eval in DSL about dry-validation

[solnic]

I wouldn't want to make the already complex dsl code even more complex with this dual-arity mode. There are already lower level APIs for building up schema rules, these should be used in such cases. They are definitely not polished as the dsl, but I would be more interested in making them robust and simple to use vs messing with the dsl blocks.

[solnic]

@hooptie45 I was just chatting with Luca from Hanami project about the same thing and prepared a sample script which shows how to build rules manually, I figured I should share here too:

require 'dry-validation'

v = Dry::Validation::Schema::Value.new

v.key(:email).required(:str?)
v.key(:age).required(:int?)

class UserSchema < Dry::Validation::Schema::Form
end

UserSchema.configure do |config|
  config.rules = v.rules
end

schema = UserSchema.new

puts schema.(email: ‘[e-mail]’, age: 'no idea').messages.inspect

[solnic]

I'm gonna close this one since the DSL won't be changed to support dynamic generation of rules. We have low-level interfaces to do this and even when these are not enough you can always build rule ast yourself. This will be documented properly once we're close to 1.0.0.