create with has_many through association gets NoMethodError (undefined method `name' for nil:NilClass)

Question

I\'m doing this tutorial and am stuck in the Tagging part. Basically I have articles that can have a list of tags. As one article can has multiple tags and vice versa, there

Answer 1

FYI, I can confirm this is an issue with ActiveRecord and Ruby 2.2. I was using ActiveRecord 3.2 and since changing to the 3-2-stable branch, the issue is gone. I believe this is fixed now in 4.x branches. I have raised an issue for this at https://github.com/rails/rails/issues/18991.

Answer 2

I think there is a bug in activerecord 4.1.0 with has_cached_counter? and ruby 2.2. It was fixed on activerecord 4.1.2.

I got it to work by switching rails versions from 4.1.0 to 4.1.2.

Answer 3

Upgrade to Rails 4.0.13 (or later) or downgrading to Ruby 2.1.1 solves the problem.

Answer 4

I got it to work by switching ruby versions. I was using ruby-head, which is ruby 2.2.0dev. Switched back to ruby-2.1.1, now it works without errors. Should've probably tried that earlier...

Maybe this could help others facing similar errors.