Question

I have a User model that has a Roles collection.

The Roles collection has columns like:

id, name, ....

I am now looping through another collection, and I would to create a new collection if the role_id’s match, so:

SomeOtherCollection.each do |i|

@blah << i  if self.Roles.contains i.role_id

end

Contains doesn’t exist, how can I do this?

The faster method the better since this will happen allot.

Answer 1

Assuming Role is an ActiveRecord model and you mean to call self.roles, not self.Roles, and you’re using Rails 3:

SomeOtherCollection.each do |i|
  @blah << i  if self.roles.where(:role_id => i.role_id).count > 0
end

Side note: cancan is a really great authorization gem that you might find useful.