#24289: Is usage of many_to_one and one_to_many terms confusing for relation
flags?
-------------------------------------+-------------------------------------
Reporter: akaariai | Owner: nobody
Type: Bug | Status: closed
Component: Database layer | Version: 1.8alpha1
(models, ORM) |
Severity: Normal | Resolution: invalid
Keywords: | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Changes (by loic):
* cc: loic (added)
Comment:
I understand that I'm probably wrong because this seems logical to a few
people, but I just can't get it for some reason.
> ForeignKeys are One-to-many, based on the interpretation that there is
"one" value on the side that defines them, and "many" on the other side.
> However, it's easy to look at it the other way, and say that a
ForeignKey is defining the fact that there where it is defined, it's going
to point to "many" objects, and on the other side, it will point to "one"
object.
Both statements read the same to me, the first one says `"one" value on
the side that defines them` the other one says `where it is defined, it's
going to point to "many" objects` (i.e. if the side it **points to** is
the "many" side, then it is itself the "one" side).
From my perspective:
{{{
class Employee(Model):
company = ForeignKey(to=Company)
# many-to-one
>>> Employee.objects.first().company
<Company: 1>
# one-to-many
>>> Company.objects.first().employee_set
[<Employee: 1>, <Employee: 2>, <Employee: 3>]
}}}
`Employee` where it is defined points **to** "exactly one object"
(`Company`), the reverse field however `Company.employee_set` points
**to** "many objects" (all the employees).
--
Ticket URL: <https://code.djangoproject.com/ticket/24289#comment:3>
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