#24289: ForeignKey is many_to_one, not one_to_many
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Reporter: akaariai | Owner: nobody
Type: Bug | Status: new
Component: Database | Version: 1.8alpha1
layer (models, ORM) |
Severity: Normal | Keywords:
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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It seems we have mixed up the naming of many_to_one and one_to_many. For
example these references point out that ForeignKey is many_to_one:
http://www-01.ibm.com/support/knowledgecenter/SSEPGG_8.2.0/com.ibm.db2.udb.doc/admin/c0004733.htm,
https://docs.djangoproject.com/en/1.7/topics/db/examples/many_to_one/.
But in Django, ForeignKey is one_to_many.
I'm not going to mark this as accepted, as I always get confused with
many-to-one and one-to-many. So, please do triage this carefully!
If at all possible I think we should use something that is less easy to
get mixed up. I never recall how these terms should be interpreted, and I
guess I am not alone here. Some ideas:
- Just is_multivalued flag: Check if field is one to many: "not
field.is_multivalued and field.rel.is_multivalued"
- local_multivalued and remote_multivalued flags
My experience from ORM work is that the interesting thing to check is if
the relation can have multiple values on the remote side. The local multi-
valuedness isn't usually that interesting (although it might be in other
contexts).
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Ticket URL: <https://code.djangoproject.com/ticket/24289>
Django <https://code.djangoproject.com/>
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