How to fix: "RuntimeWarning: Model  was already registered."
I have gotten this error because of automatic imports I had in my __init__.py. I had some old code that imported by signals there, and moving that import code to AppConfig instead fixed it.
Since upgrading Django, I've been getting this error in iPython when I do imports:

RuntimeWarning: Model 'docket.search' was already registered. Reloading models is not advised as it can lead to inconsistencies, most notably with related models.

I'm guessing this is some automatic feature of iPython, but is there an easy solution? Is this something I even need to solve?