Q:

Simple CanCan problem

I have just started with CanCan and here's a sample of the code:
# Ability.rb
def initialize(user)    
  user ||= User.new      

  can :read, Link
end

# view.html.erb
<% if can? :read, @link %>
  ...
<% end %>

This is from the github repo for CanCan but this doesn't seem to work (it returns false and stops the ... code from running).
When I change the view to <% if can? :read, Link %>, it works. But, this is different to the CanCan readme. Do you know where I'm going wrong here?

A:

can? :read, Link

is the concept of a link... something to the akin of "Can you read all links?"
can :read, Link do |link|
  link.account.id == user.account_id
end

This checks to make sure you can read the specific link object in question

