#26081: Understanding MyModel._meta.get_fields()
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Reporter: guettli | Owner: nobody
Type: Uncategorized | Status: new
Component: Database layer | Version: 1.9
(models, ORM) |
Severity: Normal | Resolution:
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 guettli):
* needs_better_patch: => 0
* component: Documentation => Database layer (models, ORM)
* needs_tests: => 0
* needs_docs: => 0
Old description:
> We try to understand what `MyModel._meta.get_fields()` does.
>
> Pull request coming to improve the docs.
New description:
We try to understand what `MyModel._meta.get_fields()` does.
https://docs.djangoproject.com/en/1.9/ref/models/meta/#django.db.models.options.Options.get_fields
{{{
Returns a tuple of fields ...
}}}
get_fields() returns two different types of objects:
* django.db.models.fields
* ManyToOneRel, OneToOneRel or ManyToManyRel
If you print the items of get_fields() you see the difference:
{{{
<ManyToOneRel: foo.tickettype>
<ManyToOneRel: foo.ticket>
...
foo.Tickettype.id
foo.Tickettype.parent
foo.Tickettype.name
...
}}}
According to the docs you get "fields". But you get first Rel-Objects and
then DB-fields.
The example in the docs is the same:
https://docs.djangoproject.com/en/1.9/ref/models/meta/#django.db.models.options.Options.get_fields
{{{
(<ManyToOneRel: admin.logentry>,
<django.db.models.fields.AutoField: id>,
...
}}}
We are missing a common base class.
The wording is confusing since you speak of "field" but get_fields()
returns fields and rels.
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Ticket URL: <https://code.djangoproject.com/ticket/26081#comment:1>
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