Question

I need to enforce a composite key at the database level. The composite key is made up of five columns. In django, I can do a pseudo-composite key with:

unique_together = ("col1", "col2", "col3", "col4", "col5")

However, ALL the data being inserted into the table is from a python script outside of django. The script will simply not work if this composite primary key is not enforced (and I don’t want to address this issue at a script level).

How would I go about this issue, or is django simply out of the question to accomplish this here?

Update: I see from the comments that this is enforced at the database level. Is there also a way to get rid of the auto-incrementing primary key here? Note that none of the columns by themselves will ever be unique.

Answer 1

You can use unique_together for this.

From the Django docs on unique together docs (my emphasis):

This is a list of lists of fields that must be unique when considered together. It’s used in the Django admin and is enforced at the database level (i.e., the appropriate UNIQUE statements are included in the CREATE TABLE statement).