form.feature

And a form exists with name: "SAT Test Score", form_category: the form category
  And the following strings exist:
    | name           | column               | required | title_field | id | form     | visibility_rule_in_json |
    | Score          | SAT_I_MATH_SCORE     | true     | true        |    | the form |                         |
    | Are you lying? | SAT_II_SUBJECT       | true     |             | 1  | the form |                         |
    | Actual Score   | SAT_II_SUBJECT_SCORE | true     |             |    | the form | {"rule":'include',"values":["maybe","yes"],"responsible_field_id":'1'} |

in_json.rb

require 'pickle/world'

module Pickle::Session
  def create_model(pickle_ref, fields = nil)
    factory, label = *parse_model(pickle_ref)
    raise ArgumentError, "Can't create with an ordinal (e.g. 1st user)" if label.is_a?(Integer)
    fields = fields.is_a?(Hash) ? parse_hash(fields) : parse_fields(fields)
    
    #my addition
    fields = allow_json_fields(fields)
    
    record = pickle_config.factories[factory].create(fields)
    store_model(factory, label, record)
  end
  
  #my addition
  def allow_json_fields(hash)
    hash.inject({}) do |new_hash, (key, val)|
      new_key, new_val = key, val
      
      if key.to_s =~ /^(.*)_in_json$/
        new_key = $1
        new_val = val && ActiveSupport::JSON.decode(val)
      end
      
      new_hash.merge new_key => new_val
    end
  end
end