Migrate a plugin from one type to another

0001_initial.py

from django.db import migrations


def migrate_to_new_plugin(apps, schema_editor):
    OldPluginModel = apps.get_model("myapp", "PluginModel")
    NewPluginModel = apps.get_model("myapp", "PluginModel")
    for obj in OldPluginModel.objects.all():
#                          
        new_obj = NewPluginModel()
        new_obj.id = obj.id
        new_obj.placeholder = obj.placeholder
        new_obj.parent = obj.parent
        new_obj.position = obj.position
        new_obj.language = obj.language
        new_obj.creation_date = obj.creation_date
        new_obj.depth = obj.depth
        new_obj.path = obj.path
        new_obj.numchild = obj.numchild
        new_obj.plugin_type = "MyNewPluginName"
        # Add something like `new_obj.field_name = obj.field_name` for any field in the the new plugin
        obj.delete()
        new_obj.save()
        # Copy any many to many field after save:`new_plugin.many2many.set(old_plugin.many2many.all())`

class Migration(migrations.Migration):

    dependencies = [
        ("myapp", "other_migration"),
    ]

    operations = [migrations.RunPython(migrate_to_new_plugin, migrations.RunPython.noop)]