Dynamically set named_scope based on current_user

Hey all,
I keep getting the following error:

You have a nil object when you didn’t expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.size

Based on the current user, when they navigate to a page, I want to limit
them to what they can see based on their site. Problem is there is no
association between site and user table directly. A contact has_one user
(user information is stored in current_user variable). A site has_many
contacts. And a site has_many students, where students table has a
foreign
key of site_id. So there is a link between students and site, so when
the
current user navigates to students page, they can only see students from
same site as them. I can do this by hard coding a number in a
named_scope to
only display students for the site of the current_user. But different
users
will belong to different sites so when logged in, the site their
associated
with will change. That’s the problem - to dynamically set that value in
a
named_scope. This is what I have:

StudentsController

def index_scoper
if current_user.role_id == 8
super.site_staff_limit while current_user[:site_id] #The problem is
the
user table has no site_id. There is no direct link between the users
table
and sites table. However, there is a link between users and contacts and
then site and contacts and then site and students, where students table
has
site_id.
else
super.with_state.with_site
end
end

Student Model
named_scope :site_staff_limit, lambda {|site_id| {:conditions =>
{:site_id => site_id}}}

Thanks for any suggestions.


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Given those relationships, you should be able to use
current_user.contact.site_id.

site has many contacts through a polymorphic relationship:

relationship between tables:

users: contact_id
contact: primary key, contactable_id, contactable_type
site: primary key
student: site_id

User model
belongs_to :contact

Contact model
has_one :user
belongs_to :contactable, :polymorphic => true, :dependent => :destroy

Site model
has_many :contacts, :as => :contactable
has_many :students

Students model
belongs_to :site

This successfully limits the students by site:
StudentsController
def index_scoper
if current_user.role_id == 8
super.site_staff_limit
else
super.with_state.with_site
end
end

Students model
named_scope :site_staff_limit, :conditions => {:site_id => 1}

The problem is different users will belong to different sites, so they
can
only access student records of the site they belong to. I am having
difficulty making that named_scope above dynamic enough to accomplish
this.

View this message in context:
http://old.nabble.com/dynamically-set-named_scope-based-on-current_user-tp27331346p27339013.html
Sent from the RubyOnRails Users mailing list archive at Nabble.com.

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