Field encoding

import datetime

import types

from django.db import models

class MigrationWriter(object):

        # Simple types

        elif isinstance(value, (int, long, float, str, unicode, bool, types.NoneType)):

            return repr(value), set()

        # Django fields

        elif isinstance(value, models.Field):

            attr_name, path, args, kwargs = value.deconstruct()

            module, name = path.rsplit(".", 1)

            if module == "django.db.models":

                imports = set()

            else:

                imports = set("import %s" % module)

                name = path

            arg_strings = []

            for arg in args:

                arg_string, arg_imports = cls.serialize(arg)

                arg_strings.append(arg_string)

                imports.update(arg_imports)

            for kw, arg in kwargs.items():

                arg_string, arg_imports = cls.serialize(arg)

                imports.update(arg_imports)

                arg_strings.append("%s=%s" % (kw, arg_string))

            return "%s(%s)" % (name, ", ".join(arg_strings)), imports

        # Functions

        elif isinstance(value, (types.FunctionType, types.BuiltinFunctionType)):

            # Special-cases, as these don't have im_class

import datetime

from django.test import TransactionTestCase

from django.db.migrations.writer import MigrationWriter

from django.db import migrations

from django.db import models, migrations

class WriterTests(TransactionTestCase):

        migration = type("Migration", (migrations.Migration,), {

            "operations": [

                migrations.DeleteModel("MyModel"),

                migrations.AddField("OtherModel", "field_name", models.DateTimeField(default=datetime.datetime.utcnow))

            ],

            "dependencies": [("testapp", "some_other_one")],

        })