[Rails] Preventing destroy action via a DELETE HTTP request submitted with jQuery

Hi folks,

Rails beginner here..

I have a users resource where I implemented a callback that's supposed
to prevent an admin user from deleting herself.

before_filter :admin_no_delete, only: :destroy

def admin_no_delete
admin_id = current_user.id if current_user.admin?
redirect_to users_path if params[:id] == admin_id
end

If this looks familiar to some, it's from Michael Hartl's rails
tutorial, exercise #10 here
http://ruby.railstutorial.org/chapters/updating-showing-and-deleting-users?version=3.2#sec:updating_deleting_exercises

My (lame) test for this actually runs successfully

describe "deleting herself should not be permitted" do
before do
delete user_path(admin)
end
it { should redirect_to(users_path) }
end
end

The test seems lame because I was able to go around it using jQuery to
delete the record being protected by the callback (using Web
Inspector's javascript console):
$.ajax({url: 'http://localhost:3000/users/104', type: 'DELETE',
success: function(result){alert(result)} })

Looking for ideas on how to prevent a DELETE HTTP request from
succeeding in this situation.. also any ideas on how to properly test
for this kind of situation?

Thanks.
rme

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