gistfile1.rb

require 'virtus'

# This Works!
class User
  include Virtus.model
  attribute :name, String
  attribute :group, String
end

# Class User trying to make private attributes
class User_Private
  include Virtus.model
  attribute :name, String, :accessor => private
  attribute :group, String, :accessor => private
end

# This fails!
u = User_Private.new(name:"demo", group:"staff")

###
# I am trying to have this ...
###

class UserForm < User 
  # ... something to make all attributes READ-ONLY
end

u = UserForm.new(name:"demo", group:"staff")
u = UserForm.new(user_post_data_hash)
u.name = 'other' # FAIL
u.name           # OK

class UserEntity < User
  # ... something to make all attributes PRIVATE
end

model = UserForm.new(name:"demo", group:"staff")
u = UserEntity(model)
u.name = 'other' # FAIL
u.name           # FAIL

class UserValidationGUI < User
end

class UserValidationDomain < User
end

My problem is that I try to avoid the standard Virtus object examples. Usually I split them in two groups. One case is for value-like containers (all attributes read-only) like UserForm. The other case is for state-containing objects. A class containing state, must expose no attributes, not even read-only.