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adding cannot method to define which abilities cannot be done - closes #7

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This commit is contained in:
Ryan Bates
2009-11-25 10:25:58 -08:00
parent e60365505c
commit d4405e6070
4 changed files with 59 additions and 14 deletions
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25
lib/cancan/ability.rb
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@@ -41,19 +41,19 @@ module CanCan
# end
#
def can?(original_action, target) # TODO this could use some refactoring
(@can_history || []).reverse.each do |can_action, can_target, can_block|
(@can_history || []).reverse.each do |base_behavior, can_action, can_target, can_block|
can_actions = [can_action].flatten
can_targets = [can_target].flatten
possible_actions_for(original_action).each do |action|
if (can_actions.include?(:manage) || can_actions.include?(action)) && (can_targets.include?(:all) || can_targets.include?(target) || can_targets.any? { |c| c.kind_of?(Class) && target.kind_of?(c) })
if can_block.nil?
return true
return base_behavior
else
block_args = []
block_args << action if can_actions.include?(:manage)
block_args << (target.class == Class ? target : target.class) if can_targets.include?(:all)
block_args << (target.class == Class ? nil : target)
return can_block.call(*block_args)
return base_behavior ? can_block.call(*block_args) : !can_block.call(*block_args)
end
end
end
@@ -114,7 +114,24 @@ module CanCan
#
def can(action, target, &block)
@can_history ||= []
@can_history << [action, target, block]
@can_history << [true, action, target, block]
end
# Define an ability which cannot be done. Accepts the same arguments as "can".
#
# can :read, :all
# cannot :read, Comment
#
# A block can be passed just like "can", however if the logic is complex it is recommended
# to use the "can" method.
#
# cannot :read, Product do |product|
# product.invisible?
# end
#
def cannot(action, target, &block)
@can_history ||= []
@can_history << [false, action, target, block]
end
# Alias one or more actions into another one.