In this episode, we're remodeling! I changed the model relationship between GradeLevel and Course from a ForeignKey (1 to many) to a ManyToManyField. We talked through the change and started fixing all the tests that broke.
After explaining the change that I wanted to make and why I want to make it, I explained how a foreign key and many to many relationship at the database level.
Once we had the conceptual foundation in place, I started with the documentation. We looked at the ManyToManyField and what changes were needed to convert a ForeignKey to a ManyToManyField.
After the change, we immediately saw the value of having a test suite that runs all the code. We ran the tests and see the test suite light up like a Christmas tree with errors.
For the remainder of the stream, I worked to fix errors in the suite by fixing the broken code and the broken tests.
This article first appeared on mattlayman.com.
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