如何在 Django 中使用 call_command() 在特定数据库上进行 运行 迁移？

Question

我只是想知道在运行时使用 management.call_command() 函数调用 $ python manage.py migrate app_name --database db_name 的正确语法是什么。

到目前为止，我有以下内容：

from django.core import management
from django.core.management.commands import migrate

# Migrate the core.contrib.dynamics if needed to the pre-specified database:
management.call_command(migrate.Command(), 'dynamics', '--database {}'.format(DB_NAME))

但是，我在运行时遇到以下错误：

Cannot find a migration matching '--database default_node' from app 'dynamics'.

我 99% 确定我可能错误地调用了 -- 参数？谁能用这个给我指出正确的方向？

动态应用的迁移如下：

# Generated by Django 3.0.8 on 2020-07-02 14:28

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


class Migration(migrations.Migration):

    initial = True

    dependencies = [
    ]

    operations = [
        migrations.CreateModel(
            name='ModelSchema',
            fields=[
                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
                ('name', models.CharField(max_length=32, unique=True)),
                ('_modified', models.DateTimeField(auto_now=True)),
            ],
        ),
        migrations.CreateModel(
            name='FieldSchema',
            fields=[
                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
                ('name', models.CharField(max_length=63)),
                ('data_type', models.CharField(choices=[('character', 'character'), ('text', 'text'), ('integer', 'integer'), ('float', 'float'), ('boolean', 'boolean'), ('date', 'date')], editable=False, max_length=16)),
                ('null', models.BooleanField(default=False)),
                ('unique', models.BooleanField(default=False)),
                ('max_length', models.PositiveIntegerField(null=True)),
                ('model_schema', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='fields', to='dynamics.ModelSchema')),
            ],
            options={
                'unique_together': {('name', 'model_schema')},
            },
        ),
    ]

Answer 1

考虑到您已经 运行 迁移，您可以简单地使用

management.call_command('migrate', app_label='dynamics', database='dbname')