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# Copyright 2011-2012 Rice University. Licensed under the Affero General Public
# License version 3 or later. See the COPYRIGHT file for details.
module OpenStax
module Utilities
module DelegateAccessControl
# Adds code to an ActiveRecord object to delegate its access control methods to
# another object.
# @example Model is ordered globally using a 'number' field
# class MyModel < ActiveRecord::Base
# belongs_to :another
# delegate_access_control to: :another
# @param :to The relationship to which the access control methods should
# be delegated.
# @param :include_sort If true, a "can_be_sorted_by?" method will be included
# (Default: false)
#
def delegate_access_control(options={})
configuration = {include_sort: false}
configuration.update(options) if options.is_a?(Hash)
raise IllegalArgument, "A :to option must be provided" if configuration[:to].blank?
configuration[:to] = configuration[:to].to_s
class_eval <<-EOV
delegate :can_be_read_by?,
:can_be_updated_by?,
to: :#{configuration[:to]}
# Delegating creation and destroying of this contained object means you can
# update the containing object
alias_method :can_be_created_by?, :can_be_updated_by?
alias_method :can_be_destroyed_by?, :can_be_updated_by?
if #{configuration[:include_sort]}
alias_method :can_be_sorted_by?, :can_be_updated_by?
end
EOV
end
# Convenience method for delegate_access_control
def delegate_access_control_to(relation, options = {})
delegate_access_control options.merge(to: relation)
end
end
end
end
ActiveRecord::Base.extend OpenStax::Utilities::DelegateAccessControl
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17 entries across 17 versions & 1 rubygems