#23790: Possible bad interaction between migration dependencies and relabeling
apps
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Reporter: aaugustin | Owner: nobody
Type: Bug | Status: new
Component: Migrations | Version: 1.7
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 carljm):
A third-party app with models changing its label has always meant changing
the name of all its database tables, too (unless it uses `Meta.db_table`
to preserve them). So it's always been the case that changing the label of
an app with models is a Fairly Backwards Incompatible Thing To Do. I guess
what's new in 1.7 is that a) changing app-label is easier than it used to
be (no longer implies changing import path), and b) migrations introduce a
new layer of label-dependence that isn't fixed by using a backwards-
compatible `Meta.db_table`.
I'm having trouble seeing a way to make this smoother, other than possibly
improving the error message (though the current one isn't terrible) and
probably adding a note to the docs in the `AppConfig` section clarifying
that changing `app_label` midstream is a breaking change for any existing
installs of that app. Fundamentally, migrations need some way to reliably
and persistently reference an app, and that's always been the purpose of
app-label.
--
Ticket URL: <https://code.djangoproject.com/ticket/23790#comment:7>
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