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dj-migration-test's Introduction

Hi there 👋

My name is Philipp. I have a B. Sc. in Mathematics and am a big software engineering entusiast that loves to explore numerical and statistical methods to solve problems.

  • 🧙‍♂️ Over the past years I've been cooking several things
  • 🌱 I’m currently learning techniques of Game Development 👾, Machine Learning 🤖, Computer Vision 🌎, Reinforced Deep-Q-Learning 🐤 and solving differential equations 📈.
  • ✍️ You can contact me via Mail or other social channels listed in my profile

Check out my contributions on other platforms, like HuggingFace 🤗

https://philipp-zettl-my-heatmap.static.hf.space

  • 👨‍🏫 Early 2022 I wrote my Thesis with the topic: "Machine Learning Methods for Localiazation and Classification of Insects in Images" and plan to build a more advanced guideline for object detection / image classification tasks.
  • 🧑‍🏫 In summer 2023 I taught an introductory class to Machine Learning at Berliner Hochschule für Technik (BHT)

dj-migration-test's People

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dj-migration-test's Issues

add support for factories

I noticed using factory-boy breaks test cases having factories using models with newly introduced fields.

version

current release: dj-migration-test-0.1a0

minimal setup to begin with

model.py

import factory
from django.db import models


class ModelA(models.Model):
    field1 = models.BooleanField(default=True)


class ModelB(models.Model):
    relation_field = models.ForeignKey(to='ModelA', on_delete=models.CASCADE)


class ModelAFactory(factory.DjangoModelFactory):
    class Meta:
        model = ModelA


class ModelBFactory(factory.DjangoModelFactory):
    relation_field = factory.SubFactory(ModelAFactory)
    field2 = models.BooleanField(default=False)

    class Meta:
        model = ModelB
Generated migrations

0001_initial.py

from django.db import migrations, models
import django.db.models.deletion


class Migration(migrations.Migration):

    initial = True

    dependencies = [
    ]

    operations = [
        migrations.CreateModel(
            name='ModelA',
            fields=[
                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
                ('field1', models.BooleanField(default=True)),
            ],
        ),
        migrations.CreateModel(
            name='ModelB',
            fields=[
                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
                ('relation_field', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='factories.ModelA')),
            ],
        ),
    ]

0002_modelb_field2.py

from django.db import migrations, models


class Migration(migrations.Migration):

    dependencies = [
        ('factories', '0001_initial'),
    ]

    operations = [
        migrations.AddField(
            model_name='modelb',
            name='field2',
            field=models.BooleanField(default=False),
        ),
    ]

test.py

from dj_migration_test import MigrationTestCase

from factories.factories import ModelBFactory


class FirstMigrationTestCase(MigrationTestCase):
    migrate_to = ('factories', '0002_modelb_field2')

    @staticmethod
    def setUpDataBeforeMigration(self, apps):
        model_b = ModelBFactory()
        self.model_b_id = model_b.id

    def test_thread_migration(self):
        model_b_class = self.apps.get_model('factories', 'ModelB')
        model_b = model_b_class.objects.get(id=self.model_b_id)

        self.assertFalse(model_b.field2)

running the test suite results in

[...]
django.db.utils.OperationalError: table factories_modelb has no column named field2

and fails already in setUpDataBeforeMigration.

update readme

the readme still contains the badge from circle-ci

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