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Association pre-loading fails with has_and_belongs_to_many (2.1.0)
Reported by Dimitrij Denissenko | June 7th, 2008 @ 04:36 PM
Association pre-loading fails with has_and_belongs_to_many if additional includes are defined.
class User < ActiveRecord::Base
has_and_belongs_to_many :groups, :include => [:permissions] # works if :include => [:permissions] is NOT specified
end
class Group < ActiveRecord::Base
has_and_belongs_to_many :permissions
end
class Permission < ActiveRecord::Base
end
User.find 1, :include => [:groups]
NoMethodError: 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.each
from /usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/association_preload.rb:45:in `add_preloaded_records_to_collection'
from /usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/association_preload.rb:63:in `set_association_collection_records'
from /usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/association_preload.rb:61:in `each'
from /usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/association_preload.rb:61:in `set_association_collection_records'
from /usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/association_preload.rb:109:in `preload_has_and_belongs_to_many_association'
from /usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/association_preload.rb:40:in `send'
from /usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/association_preload.rb:40:in `preload_one_association'
from /usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/association_preload.rb:38:in `each'
from /usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/association_preload.rb:38:in `preload_one_association'
from /usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/association_preload.rb:17:in `preload_associations'
from /usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/association_preload.rb:16:in `preload_associations'
from /usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/association_preload.rb:16:in `each'
from /usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/association_preload.rb:16:in `preload_associations'
from /usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/base.rb:1343:in `find_every'
from /usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/base.rb:1376:in `find_one'
from /usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/base.rb:1362:in `find_from_ids'
from /usr/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/base.rb:537:in `find'
from (irb):8
Comments and changes to this ticket
-
-
-
Pratik July 23rd, 2008 @ 02:11 PM
- State changed from “new” to “duplicate”
- Tag set to “activerecord, association_preload, bug, eager_loading”
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Dimitrij Denissenko
Pratik