Data migration script populating db table - testing

[Murthy Sandeep]

Hi

I have created an data migration script for populating one of
app db tables with data from a JSON file. First I ran

python manage.py makemigrations --empty TPP_App



(‘TPP_App’ is the name of my app) and then I added a custom
method called populate_db which will use bulk_create to add
multiple entries to the table, and then do a save() to write the
changes to the db. At the moment the custom method is empty
because I am still working on it, but the script looks like this right
now

# -*- coding: utf-8 -*-
from __future__ import unicode_literals

from django.db import models, migrations

def populate_db( apps, schema_editor ):
print ‘Populating db from JSON file...'

class Migration(migrations.Migration):

dependencies = [
('TPP_App', '0003_auto_20150224_2024'),
]

operations = [
migrations.RunPython( populate_db ),
]

How do I test this script to make sure the custom method works
as expected, before I run it fully? Can I call this from the interpreter
and test it with the db API?

At the moment if I do

python manage.py migrate

it reports there are no migrations to apply.

Sandeep

[Filipe Ximenes]

One way to do it is to run all operations, don't call "save" and verify "manually" if objects are correct.

I don't know about other methods, but if someone else does it would be great.

Sandeep


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Filipe Ximenes +55 (81) 8245-9204 Vinta Software Studio http://www.vinta.com.br