#26291: loaddata cannot deserialize fixtures with forward references and natural
foreign keys
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Reporter: inglesp | Owner: nobody
Type: New feature | Status: new
Component: Core | Version: 1.9
(Serialization) |
Severity: Normal | Resolution:
Keywords: | Triage Stage:
| Unreviewed
Has patch: 1 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by inglesp):
Thanks for taking a look at this.
There are a handful of problems with Django's current dependency
resolution.
Firstly, `loaddata` cannot handle circular references at all.
Secondly, even without circular references, `dumpdata` can produce data
that `loaddata` cannot load, requiring manual re-ordering of a fixture.
This could happen if a field of a model instance references another
instance of the same model, where the pk of the referenced model is
greater than the pk of the referring model, since `dumpdata` dumps
instances of a model in order of it pk.
Finally, Django's current dependency resolution depends on `loaddata`
importing data that was created by `dumpdata`. If the data comes from
another source, `sort_dependencies`'s logic must be followed.
This last problem is the cause of my own interest in the issue, but I
think that the fact that `dumpdata` can produce data that `loaddata`
cannot load is reason enough to consider a solution.
--
Ticket URL: <https://code.djangoproject.com/ticket/26291#comment:2>
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