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module CanCan
module Ability
attr_accessor :user
def self.included(base)
base.extend ClassMethods
base.alias_action :index, :show, :to => :read
base.alias_action :new, :to => :create
base.alias_action :edit, :to => :update
end
def can?(original_action, target) # TODO this could use some refactoring
(self.class.can_history || []).reverse.each do |can_action, can_target, can_block|
possible_actions_for(original_action).each do |action|
if (can_action == :manage || can_action == action) && (can_target == :all || can_target == target || target.kind_of?(can_target))
if can_block.nil?
return true
else
block_args = []
block_args << action if can_action == :manage
block_args << (target.class == Class ? target : target.class) if can_target == :all
block_args << (target.class == Class ? nil : target)
return instance_exec(*block_args, &can_block)
end
end
end
end
false
end
def possible_actions_for(initial_action)
actions = [initial_action]
(self.class.aliased_actions || []).each do |target, aliases|
actions += possible_actions_for(target) if aliases.include? initial_action
end
actions
end
module ClassMethods
attr_reader :can_history
attr_reader :aliased_actions
def can(action, target, &block)
@can_history ||= []
@can_history << [action, target, block]
end
def alias_action(*args)
@aliased_actions ||= {}
target = args.pop[:to]
@aliased_actions[target] = args
end
def for_user(user)
ability = new
ability.user = user
ability
end
end
end
end
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