From: Josselin <josselin@...>
Date: 2006-08-11T15:40:05+09:00
Subject: Re: good writing in Ruby...

On 2006-08-10 18:37:18 +0200, "Paolo Negri" <hungrylist@gmail.com> said:

> Some more infos about what are the relations among the User class and
> the roles array would be nice.
> 
> Anyway you can easily rewrite your role= method of the User class to
> something like this
> 
> def role=(value, array)
>     self.role = array.delete value if array.member? value
> end
> 
> or, if you are happy to end up with a role of nil in case the role is
> invalid/already given away
> 
> def role=(value, array)
>   self.role = array.delete value
> end
> 
> 
> On 10/08/06, Josselin <josselin@wanadoo.fr> wrote:
>> I know I can write it the 'ugly common way' (loop)
>> but I'd like to see how it can be done the Ruby way ... (I am a newbie...)
>> 
>> here is an array
>> roles = [ "a", "b", "c", "d", "e" ]
>> 
>> Depending upon a variable 'user.role',
>> I would like to  suppress all elements in the array , less or equal to
>> this variable
>> 
>> ex :
>> user.role = "a"    #=> roles = ["b", "c", "d", "e" ]                    
>> "a" deleted
>> user.role = "b"    #=> roles = ["c", "d", "e" ]                 "a", 
>> "b"  deleted
>> user.role = "c"    #=> roles = [ "d", "e" ]                     "a", 
>> "b", "c" deleted
>> user.role = "d"    #=> roles = [ "e" ]                                  
>> "a", "b", "c", "d"  deleted
>> user.role = "e"    #  do nothing
>> 
>> thanks for your tips
>> 
>> Joss
>> (I am on my way to buy the Ruby Recipes PDF Cookbook...)

in this particular case, 'roles' array is built from the table 'roles',
all values are possible roles for a new user so I don't modify the database
this  'roles' array is presented as select options,

'roles' array content is based on current_user.role
if current_user.role is 'god' then all collection (he can CRUD any 
role) is presented
if  current_user.role is 'admin' then all collection minus 'god' and 
'admin' (an admin cannot create god users or admini users)....

thanks