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

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.