MongoDB is good, and Mongoid has a lot of features. However, I ran into a few Mongoid bugs that bothered me and I am transitioning my project to PostgreSQL.
Part of that is because my boss added a lot of features to the project that are easier to implement with normalized data. I could write JavaScript map/reduce functions to handle some of the cases, but using ActiveRecord 3.1 will be easier for me and easier for the next guy to maintain.
Everyone should try Mongoid out to learn its strengths. I agree with Ilya Grigorik when he says 90+% of the time SQL remains the most practical solution for the problem at hand (paraphrased).
Part of that is because my boss added a lot of features to the project that are easier to implement with normalized data. I could write JavaScript map/reduce functions to handle some of the cases, but using ActiveRecord 3.1 will be easier for me and easier for the next guy to maintain.
Everyone should try Mongoid out to learn its strengths. I agree with Ilya Grigorik when he says 90+% of the time SQL remains the most practical solution for the problem at hand (paraphrased).