On Jan 16, 2013, at 12:03 PM, larry google groups wrote:
> I am ignorant about the implications of using :: to namespace vars.
> The fact that I have ::admin in one namespace:
>
> :users {"root"{:username "lawrence"
> :password (creds/hash-bcrypt "admin_password")
> :roles #{::admin}
> :created_at "2013-01-08 14:00:00"
> :telephone-numbers [{:country "USA" :number "434 825
> 7694"}
> {:country "USA" :number "732 364
> 3640"}]}
> "jane" {:username "jane"
> :password (creds/hash-bcrypt "user_password")
> :roles #{::user}
> :created_at "2013-01-10 16:40:34"
> :telephone-numbers []}}
>
> but then in the core name space I have:
>
> (derive ::admin ::user)
>
> and:
>
> (GET "/account" request (friend/authorize #{::user} {} (account
> request)))
> (GET "/admin" request (friend/authorize #{::admin} {} (admin
> request)))
>
> I assume I need to change this. What are the implications? These
> declarations of roles all need to reference the same namespace, yes?
::foo is unrelated to vars; that's just a keyword that happens to have a
namespace component of *ns*. If you use `::foo` in namespace A, that is
namespaced as `:A/foo`, whereas the same `::foo` in B is equivalent to
`:B/foo`. For further understanding, I suggest taking a look at
http://clojure.org/multimethods, or the hierarchy/multimethod/namespaced
keyword section of your local Clojure book.
The roles you use don't all have to be identically namespaced; that would
defeat the point of using hierarchies to model relationships among independent
sets of roles. However, if you want to refer to a given namespace's ::user,
then you do need to refer to it that way, e.g. :ns-alias/user or
:full.ns.name/user.
Cheers,
- Chas
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