Suppose we have two models, Person and Worker.
Know, I want to alter the name of Person to InterestPerson.
How does Django exactly knows that the new name belongs to the old one?
I was looking in the generated tables in DB and in the migrations, but I can't figure out how is he able to make the relation.
Same applies with fields, datatypes, lengths... etc.
If you rename Person to InterestPerson, you have technically removed the model called Person and added a new one called InterestPerson. When Django creates the migration files iterates through the new models and compares them to the deleted models, if a new model is similar (same definition) to a deleted model in the same app, Django does a rename operation with the database. Django isn't always sure that something has been renamed, in fact it sometimes prints questions in the console to figure out what/if anything has been renamed. Take a look at the definition of MigrationAutodetector (especially of the generate_renamed_models function), which is the code that detects renames.
