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Using Named Scopes Across Models with ActiveRecord#Merge

After years of working with ActiveRecord and watching it change so much, it is exciting to find new features you didn't know about. The one I discovered this week is ActiveRecord#merge. It is one of the most underused methods in ActiveRecord, due in part, to the name. It isn't necessarily clear what they mean by "merge" but it's simply a way of using a named scope on a joined model.

I ran into this exact issue in a project recently and had no idea there was a way to use scopes from joined models like this.

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