I don't understand how to use the "two" fields created in a ManyToOne
relationship?
From the tutorial, as below, Elixir will create (in Python) two fields:
'director' and 'director_id'. How are they used? And how are they kept in sync?
class Movie(Entity):
director = ManyToOne('Director')
class Director(Entity):
# movies = OneToMany('Movie')
d = Director(name="George")
m = Movie(director=d)
print m.director, m.director_id
The output will be something like:
<Director "George"> None
This seems inconsistent. The 'director_id' field makes it appear if there is
no director assigned to 'm'. But 'director' clearly holds a Director object.
Is this not dangerous? When do you use one or the other?
If 'director_id' is just a shortcut, wouldn't it be more correct and safe to
just refer to 'm.director.id'?
Note that this is complicated, IMHO, by the fact that m.table.c contains
'director_id' rather than 'director' (the more useful attr).
I'm obviously just not getting it, can someone expound on this a bit?
Thanks,
Michael
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