Question

How can I get a list of all scopes in an ActiveRecord model using Rails 3.1?

According the documentation for 3.0.9 there is supposed to be a method called “scopes” http://api.rubyonrails.org/classes/ActiveRecord/NamedScope/ClassMethods.html#method-i-scopes, but that method doesn’t seem to exist.

Answer 1

You can use Model.send(:valid_scope_name?, scope_name) to test if the scope exists in that class. Scopes did make sense in Rails 2.x but no longer in 3.x, where you have relation objects.

So instead:

 scope :red_ones, where(color: 'red')

You would have:

 def self.red_ones
   where(color: 'red')
 end