dryhints.rb

# Schema looks like:
    configure do
      def iso8601?(input)
        !(!Date.iso8601(input))
      rescue ArgumentError
        false
      end
    end

    required(:position).filled(:int?)
    required(:label).filled
    required(:kind).filled
    required(:optional).filled.bool?
    required(:options).maybe
    required(:answer).maybe

    rule(answer: [:answer, :kind, :optional, :options]) do |answer, kind, optional, options|
      (optional.false? > answer.filled?) &
        ((answer.filled? & kind.eql?('number')) > answer.number?) &
        ((answer.filled? & kind.eql?('date')) > answer.iso8601?) &
        ((answer.filled? & kind.eql?('options')) > answer.included_in?(options))
    end

# Debug session
[12] pry(main)> schema.call({kind: 'number', answer: nil, optional: false, position: 1, label: 'whatever', options: []}).messages
=> {:options=>["must be filled"]}

[13] pry(main)> schema.call({kind: 'number', answer: nil, optional: false, position: 1, label: 'whatever', options: ['1']}).messages
=> {:answer=>
  ["must be filled",
   "must be a number",
   "must be in the form of 'YYYY-MM-DD'",
   "must be one of: {:position=>1, :label=>\"whatever\", :kind=>\"number\", :optional=>false, :options=>[\"1\"], :answer=>nil}"]}
   
# Hints should only include "must be a number"
[14] pry(main)> schema.call({kind: 'number', answer: nil, optional: false, position: 1, label: 'whatever', options: ['1']}).hints
=> {:answer=>
  ["must be a number",
   "must be in the form of 'YYYY-MM-DD'",
   "must be one of: {:position=>1, :label=>\"whatever\", :kind=>\"number\", :optional=>false, :options=>[\"1\"], :answer=>nil}"]}

[15] pry(main)> schema.call({kind: 'number', answer: nil, optional: false, position: 1, label: 'whatever', options: ['1']}).errors
=> {:answer=>["must be filled"]}

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