Django migrations RunPython not able to call model methods

Question

I\'m creating a data migration using the RunPython method. However when I try to run a method on the object none are defined. Is it possible to call a method de

Answer 1

did you call your model like said in the documentation ?

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()

Data-Migration Because at this point, you can't import your Model directly :

from yourappname.models import Person

Update

The internal Django code is in this file django/db/migrations/state.py django.db.migrations.state.ModelState#construct_fields

def construct_fields(self):
    "Deep-clone the fields using deconstruction"
    for name, field in self.fields:
        _, path, args, kwargs = field.deconstruct()
        field_class = import_string(path)
        yield name, field_class(*args, **kwargs)

There is only fields that are clones in a "fake" model instance:

MyModel.__module__ = '__fake__'

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