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I would like to have a Dashboard page that gather information from multiple models to a summary view (without its own model). How should I go about it the Rails way? Should I create a dashboard_controller with just index action?
Thank you.
What you would want is to take a look at the administration frameworks and see if that solves your needs, I like Typus and RailsAdmin Otherwise you would want to take a look at the presenter pattern and how it applies to Rails and your application. A dashboard basically would only interface with your existing models and controller logic since you dont want to end up with a situation where you have two sets of logic for each model. While the blog I linked to is from 2007 you should be able to pull some useful information off of it and get the idea of what you need to do.
If you have any questions feel free to ask.