#31064: Migration doesn't detect precision changes in fields that ManyToMany
points
to.
-----------------------------+------------------------------------------
Reporter: zapililirad | Owner: Simon Charette
Type: Bug | Status: assigned
Component: Migrations | Version: master
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by Sanskar Jaiswal):
Replying to [comment:6 Simon Charette]:
> That makes sense, good old model level cache biting us again. If
`related_objects` gets out of sync it's likely because we forgot to clear
something in `AlterField.state_forwards` and my money is on
`is_referenced_by_foreign_key` not taking into account `ManyToManyField`
defined without an explicit `through` since that won't create any entry in
`state.models`.
Hey Simon,
I don't know if this helps, but while I was playing around with this
issue, calling `related_objects` on `new_field.model._meta`, always gave
me an empty `ImmutableList`, but calling `_get_fields(forward=False,
reverse=True, include_hidden=True)` gave me an `ImmutableList` of a
`ManyToOneRel`. If we look at
[https://github.com/django/django/blob/master/django/db/models/options.py#L508
related_objects] right now, it only returns Relation objects which are not
hidden or their field's `many_to_many` attribute is `True`. I am not quite
sure whether this is intended or a bug though.
Cheers
Sanskar
--
Ticket URL: <https://code.djangoproject.com/ticket/31064#comment:8>
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