Undefined method 'union' on test environment

[drselump14]

gem version: v2.0.0

Using Post.union only works on the development environment but raises an error in the test environment.
Post.all.union works in both environments.
Is it the intended behavior? because I can't found the documentation about it in Readme.

Any help would be appreciated. Thanks~

[PedroAugustoRamalhoDuarte]

I had this same error in rails console, i follow this instructions and it works: #50 (comment)

[GeorgeKaraszi]

closing this issue since recent changes might have resolved this concern. Open a new issue if this persists.