Has many :through a named scope


#1

class User

has_many :friendships
has_many :friends, :through => :friendship
end

class Friendship
belongs_to :user
belongs_to :friend, :class_name => ‘User’
named_scope :accepted, :conditons => “is_accepted = true”
named_scope :pending, :conditons => “is_accepted = false”
end

Here in the User class, i want to write
has_many :pending_friends, through a named scope friendships accepted
has_many:accepted_friends through a named scope pending

Please help,
Regards,
Pankaj


#2

I’m also trying to find a way of doing this if anybody has any
suggestions; will report back if I find a way of doing it.


#3

Hi Pankaj,

I don’t know how to do this with named_scope, but maybe you’ll like
this:

class User
has_many :pending_friends, :through => :friendship, :source =>
:friend, :conditions => {‘friendships.is_accepted’ => ‘true’}
end

However, you can’t do sth. like

@user.pending_friends << @friend

anymore in this way. See:

http://rails.lighthouseapp.com/projects/8994/tickets/718-has_many-method-doesn-t-handle-conditions

Jan


#4

Using :conditions will work but the problem is that you’ve just
introduced duplication between the conditions and the named_scope.
Anyway, here’s my initial pass at trying to solve this:

https://gist.github.com/82c50486bc38b7d7c880

It only works for conditions at the moment which was enough for me;
please do fork the gist and hack away!

Cheers
Luke