Rails：Ability和ActiveAdmin无法正常工作

Rails: Ability and ActiveAdmin not working as expected

我正在使用ActiveAdmin和Cancancan进行Ruby on Rails项目。我为角色用户定义了一些功能，例如super_administrator，administrator或subscribers。

写了一些单元测试后，我发现一些功能无法正常运行，而且我不知道出了什么问题。

具体来说，我有一个新闻通讯模块，我只希望用administrator或super_administrator来管理它。

这是我的能力摘要：

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class Ability
include CanCan::Ability

def initialize(user)
user ||= User.new # visitor user (not logged in)

alias_action :create, :read, :update, :destroy, to: :crud

if user.super_administrator?
# super_administrator privileges
elsif user.administrator?
# administrator privileges
elsif user.subscriber?
cannot :manage, Newsletter
else
cannot :destroy, :all
cannot :update, :all
cannot :create, :all
cannot :manage, Newsletter
end
end
end

我的测试：

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# this test breaks for no reason
test 'should not destroy newsletter if logged in as subscriber' do
sign_in @subscriber
assert_no_difference 'Newsletter.count' do
delete :destroy, id: @newsletter
end
assert_redirected_to admin_dashboard_path
end

private

def initialize_test
@newsletter = newsletters(:one)
@subscriber = users(:alice)
end

此测试失败，因为即使我为订户编写了不管理新闻稿的功能，新闻稿也被销毁了。

奇怪的是，如果我测试订户的能力，一切都会正常：

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# this test pass as expected by ability
test 'should test abilities for subscriber' do
sign_in @subscriber
ability = Ability.new(@subscriber)
assert ability.cannot?(:create, Newsletter.new), 'should not be able to create'
assert ability.cannot?(:read, Newsletter.new), 'should not be able to read'
assert ability.cannot?(:update, Newsletter.new), 'should not be able to update'
assert ability.cannot?(:destroy, Newsletter.new), 'should not be able to destroy'
end

我尝试直接在浏览器中手动测试，而Ability也无法正常工作。

我不明白我错过了什么。有人对我的代码有什么问题有任何线索吗？

我的项目：

Ruby 2.2.2
rails4.2.3
ActiveAdmin 1.0.0 pre1
Cancancan 1.12.0