#35508: Add an --ignore-deps flag to squashmigrations
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Reporter: Shai Berger | Owner: Clinton
| Christian
Type: New feature | Status: assigned
Component: Migrations | Version: dev
Severity: Normal | Resolution:
Keywords: squash | Triage Stage: Accepted
squashmigrations |
Has patch: 1 | Needs documentation: 1
Needs tests: 1 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by Shai Berger):
Replying to [comment:5 Clinton Christian]:
> Filtering out multi-app `FieldOperation`s is pretty straight forward,
but should we mutate a `ModelOperation` to exclude multi-app foreign key
references, or exclude the `ModelOperation` entirely?
Coming back to this after two years, with the response I put on Clinton's
[https://github.com/django/django/pull/18276 PR]:
Many {{{ModelOperation}}}s are, in fact, irrelevant, because they do not
operate on fields; so it is better to focus at the more-specific operation
level. and even then, it changes by case. In the case of
{{{CreateModel}}}, it is better to modify the operation, because it is
likely that migrations down the line will rely on the model existing --
even if they don't rely on the relation field. In the case of Index or
Constraint operations (some of which, by the way, do not inherit
{{{ModelOperation}}}), it is better to remove the whole operation, because
the constraint or index will be entirely incorrect if it is missing a
field.
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Ticket URL: <https://code.djangoproject.com/ticket/35508#comment:6>
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