how to create migrations in django
//to create migration files
python manage.py makemigrations
//to migrate migration files
python manage.py migratehow to create migrations in django
//to create migration files
python manage.py makemigrations
//to migrate migration files
python manage.py migraterunpython django migration
from django.db import migrations
def forwards_func(apps, schema_editor):
# We get the model from the versioned app registry;
# if we directly import it, it'll be the wrong version
Country = apps.get_model("myapp", "Country")
db_alias = schema_editor.connection.alias
Country.objects.using(db_alias).bulk_create([
Country(name="USA", code="us"),
Country(name="France", code="fr"),
])
def reverse_func(apps, schema_editor):
# forwards_func() creates two Country instances,
# so reverse_func() should delete them.
Country = apps.get_model("myapp", "Country")
db_alias = schema_editor.connection.alias
Country.objects.using(db_alias).filter(name="USA", code="us").delete()
Country.objects.using(db_alias).filter(name="France", code="fr").delete()
class Migration(migrations.Migration):
dependencies = []
operations = [
migrations.RunPython(forwards_func, reverse_func),
]python3 manage.py migrate
class Genre(models.Model):
"""Model representing a book genre."""
name = models.CharField(max_length=200, help_text='Enter a book genre (e.g. Science Fiction)')
def __str__(self):
"""String for representing the Model object."""
return self.nameCopyright © 2021 Codeinu
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