How can I use Mongoid and ActiveRecord in parallel in Rails 3?

Question

I\'m using rails 3, and began my application with ActiveRecord. Now, I have many models, and the relations are starting to get complicated, and some could be more simply expres

Answer 1

I don't see any reason why you couldn't have both ActiveRecord and Mongoid models in the same application. That being said, I'm almost certain that you'll run into issues if you try to create relationships between your ActiveRecord and Mongoid models.

If your ActiveRecord models are heavily inter-related, but better suited to a document structure, then I would suggest just biting the bullet and converting them all to Mongoid documents. I had to do this recently on a (large-ish) project, and it's significantly less stressful than you would think.

If you have good unit tests for your models, then it should be a total snap. If you don't - write your unit tests first, make sure they pass with ActiveRecord and then start migrating things over to Mongoid.