[wp-hackers] Get All Users with Specific capability

Peter van der Meij peter at pjvdm.nl
Wed Feb 16 15:17:09 UTC 2011

but if you would want to add a capability to a role, you don't know 
which user has which role.
so you would have to do this for every user.

Kind regards,

Peter van der Meij
e: peter at pjvdm.nl
M: +316 302 716 98

On 16-2-2011 14:02, Ryan Bilesky wrote:
> Interesting, but hakre's comment got me thinking...what if instead of doing
> away with user specific capabilities, we did away with roles.  I mean since
> when does it make sense to link a user to an arbitrary grouping (ie role)
> that just links to the actual capabilities.  Best I can tell this was done
> for simplicity, most average user's want to make a user an editor, not make
> a user who has capabilities a, b, c, 1, 2, 3, x, y, and z if you know what I
> mean.  That is all fine and good and I can understand that.  But who says
> you have to link the user to a role.  Picture this, you add a new table
> let's call it usercaps (yes, you could use usermeta for this but it'll
> probably be cleaner to do this is a different table) that will link users to
> caps, with an arbitrary auto incremented number to act as primary key, the
> scheme would be like this:
> | ID (pk) | User ID | Capability |
> --------------------------------------
> |     1     |      1       | manage_options
> ect...this can be done either way, select * from usercaps where User ID = 1
> and Capability = manage_options to see if the user has the cap, select
> UserID from usercaps where Capability = manage_options to see who has
> manage_options, or select Capability from usercaps where User ID = 1 to see
> what caps user 1 has.
> Now what about the general user, we want to keep simple things simple while
> remaining flexible is the key, you we will still have something called
> roles, it will be much like a template of capabilities to give the user, the
> net effect cleanner in the db, keeps the simple role system for the general
> user, but it's flexible for those power users.
> Now for the power users, there would be an API that a plugin could utilize
> to replace the role selector with a direct capability selector so now each
> user can have their own distinct set of capabilities, if needed.  This would
> be done via Plugin API with a plugin only for those requiring something more
> flexible than just the basic roles.
> This way you change out your old V6 roles/capabilities engine with a more
> powerful v8, while keeping things simple for the average user but remaining
> flexible for advanced users giving them more power if they need it (hey
> that's a good analogy, I'll have to remember that one, lol).
> So the big question...any feedback, suggestions, complaints, death threats
> about this? I am interested in hearing what you all have to say.
> On Tue, Feb 15, 2011 at 8:18 PM, Andrew Nacin<wp at andrewnacin.com>  wrote:
>> On Tue, Feb 15, 2011 at 7:48 PM, Jeremy Clarke<jer at simianuprising.com
>>> wrote:
>>> In 3.1 you can use get_users('role=subscriber') to avoid using any custom
>>> SQL but like you say that is not usually good enough and capabilities are
>>> fundamentally more useful and important in WP (especially in public
>> plugins
>>> where you can't make any assumptions about roles).
>>> IMHO get_users() should be able to take in a capability as well as roles,
>>> too bad that wasn't included in 3.1. It's certainly a complicated
>> problem,
>>> but it doesn't seem impossible, just potentially irresponsible WRT server
>>> performance (you'd want to cache it if you use it on most pageloads).
>> The solution here is to move away from a schema where users are given
>> capabilities directly.
>> Currently dormant Trac ticket: http://core.trac.wordpress.org/ticket/10201
>> While we're not sure when it'll be implemented, most of us are inclined to
>> implement the proposal outlined in detail here:
>> http://andrewnacin.com/2010/04/03/overhauling-roles-and-capabilities-part-2/
>> Cheers,
>> Nacin
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