Ability class: Blocks to cannot have no effect

[oldschoolguy]

If you are specifying cannot rules with block arguments in the Ability class, the block argument has no effect.

How to reproduce:

app/models/ability.rb:

class Ability
  ...
  cannot :something, Post do |p|
    true
  end

  cannot :otherthing, Post do |p|
    false
  end
  ...
end

Rails console:

>> Ability.new(User.first).can?(:something, Post)
=> false
>> Ability.new(User.first).can?(:something, Post.first)
=> false
>> Ability.new(User.first).can?(:otherthing, Post)
=> false
>> Ability.new(User.first).can?(:otherthing, Post.first)
=> false

The return value is false for all possible combinations - hence specifying the block has no effect.

Can somebody provide me with a solution for this?

[Halloran]

I think the confusion here is that Ability will default to false. Unless you've explicitly granted the ability, it is not there.

cannot :otherthing, Post do |p| false end

Does not mean that the user can otherthing, it just falls back to the default. If you really want the functionality implied above, you should do:

can :otherthing, Post do |p| true end

[oldschoolguy]

OK, I get it. Makes perfect sense. Sorry for the confusion.