Django：如何在迁移之前将初始数据放入数据库中？

Question

Added models from existing code. I'd like to put in the initial data when I migrate the models I've added.

python3 -m pip install sqlparse

python3 manage.py makeemigations sbimage

//I have edited the generated 0002 file.

python3 manage.py Migrate image 0002

//Normal operation confirmed.

python3 manage.py sqlmigrate thimage 0002

//Normal operation confirmed.

However, the data did not enter the table when the database was verified.

from django.db import migrations, models

class Migration(migrations.Migration):
    dependencies = [
        ('sbimage', '0001_initial'),
    ]

    operations = [
        migrations.CreateModel(
            name='AuthNumberR',
            fields=[
                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
                ('auth_number_r', models.CharField(max_length=64)),
            ],
        ),
        migrations.RunSQL("INSERT INTO AuthNumberR (id, auth_number_r) VALUES (2, 'c');"),
    ]

Answer 1

You can use django fixtures to provide initial data to your database. It is quite useful for your case.

Answer 2

I think you should not use naked SQL queried, instead try using something like this

from django.db import migrations

def combine_names(apps, schema_editor):
    # We can't import the Person model directly as it may be a newer
    # version than this migration expects. We use the historical version.
    Person = apps.get_model('yourappname', 'Person')
    for person in Person.objects.all():
        person.name = '%s %s' % (person.first_name, person.last_name)
        person.save()

class Migration(migrations.Migration):

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

    operations = [
        migrations.RunPython(combine_names),
    ]

Reference : https://docs.djangoproject.com/en/2.2/topics/migrations/#data-migrations