#23347: Add --dry-run to migrate
-----------------------------+----------------------
Reporter: Naddiseo | Owner: nobody
Type: New feature | Status: new
Component: Migrations | Version: 1.7-rc-3
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
-----------------------------+----------------------
In a similar vein to https://code.djangoproject.com/ticket/23263, I would
like to propose that a "--dry-run" or "--check" be added to the `migrate`
command. Basically, I want to be able to run through the migrations
without it making database changes, so that I can see if I've broken
something, especially if I'm writing a migration with a `RunPython`.
Another way I can see this working, is if sqlmigrate could also output all
the sql that was issued, including those issued by `RunPython`, so that if
I had the following migration [#migration '[0]'] it would output something
similar to [#output '[1]']
[=#migration [0]] Migration:
{{{#!python
# -*- coding: utf-8 -*-
from __future__ import unicode_literals
from django.db import models, migrations
def update_contenttypes(apps, schema_editor):
ContentType = apps.get_models('contenttypes', 'ContentType')
ContentType.objects.get(pk = 1)
class Migration(migrations.Migration):
dependencies = [
('everdeal', '0001_initial'),
]
operations = [
migrations.RunPython(update_contenttypes)
]
}}}
[=#output [1]] Output:
{{{#!bash
BEGIN;
--
-- MIGRATION NOW PERFORMS OPERATION THAT CANNOT BE WRITTEN AS SQL:
-- Raw Python operation
SELECT * FROM contenttypes_contenttype WHERE id=1;
--
ROLLBACK;
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/23347>
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