#25832: Migrating a django-cms.PlaceholderField fails when using Postgres
-------------------------------------+-------------------------------------
Reporter: jribbens | Owner: nobody
Type: Bug | Status: closed
Component: Database layer | Version: 1.8
(models, ORM) |
Severity: Normal | Resolution: invalid
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 charettes):
* status: new => closed
* needs_better_patch: => 0
* resolution: => invalid
* needs_tests: => 0
* needs_docs: => 0
Comment:
Hi @jribbens,
The `ProgrammingError` you're getting should be fixed in Django 1.9
(#25002) as long as your `description` text field contain only data that
can be casted to an integer.
If it's not the case, which is very likely given it's a free text field,
you either have to drop the original column and create a new one just like
you described or do the following:
1. Create a migration that adds the `PlaceholderField` to your model
(which is just a disguised nullable foreign key to `cms.Placeholder`).
2. Create a [https://docs.djangoproject.com/en/1.8/topics/migrations
/#data-migrations data migration] that populates the newly added
`PlaceholderField` based on the original `description` text field.
3. Create a migration that removes the original `description` text field
and rename the newly added `PlaceholderField` field if required.
Hope it helps.
--
Ticket URL: <https://code.djangoproject.com/ticket/25832#comment:1>
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