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I am using django 1.7 and I just added a custom user model. When I run either python3 manage.py makemigrations or python3 manage.py migrate I get the error: TypeError: __init__() got an unexpected keyword argument 'preserve_default'. This issue came along after adding the new custom user model. The complete traceback is:
Traceback (most recent call last): File "manage.py", line 10, in <module> execute_from_command_line(sys.argv) File "/usr/local/lib/python3.4/dist-packages/django/core/management/__init__.py", line 385, in execute_from_command_line utility.execute() File "/usr/local/lib/python3.4/dist-packages/django/core/management/__init__.py", line 377, in execute self.fetch_command(subcommand).run_from_argv(self.argv) File "/usr/local/lib/python3.4/dist-packages/django/core/management/base.py", line 288, in run_from_argv self.execute(*args, **options.__dict__) File "/usr/local/lib/python3.4/dist-packages/django/core/management/base.py", line 338, in execute output = self.handle(*args, **options) File "/usr/local/lib/python3.4/dist-packages/django/core/management/commands/migrate.py", line 63, in handle executor = MigrationExecutor(connection, self.migration_progress_callback) File "/usr/local/lib/python3.4/dist-packages/django/db/migrations/executor.py", line 17, in __init__ self.loader = MigrationLoader(self.connection) File "/usr/local/lib/python3.4/dist-packages/django/db/migrations/loader.py", line 48, in __init__ self.build_graph() File "/usr/local/lib/python3.4/dist-packages/django/db/migrations/loader.py", line 173, in build_graph self.load_disk() File "/usr/local/lib/python3.4/dist-packages/django/db/migrations/loader.py", line 103, in load_disk migration_module = import_module("%s.%s" % (module_name, migration_name)) File "/usr/lib/python3.4/importlib/__init__.py", line 109, in import_module return _bootstrap._gcd_import(name[level:], package, level) File "<frozen importlib._bootstrap>", line 2231, in _gcd_import File "<frozen importlib._bootstrap>", line 2214, in _find_and_load File "<frozen importlib._bootstrap>", line 2203, in _find_and_load_unlocked File "<frozen importlib._bootstrap>", line 1200, in _load_unlocked File "<frozen importlib._bootstrap>", line 1129, in _exec File "<frozen importlib._bootstrap>", line 1448, in exec_module File "<frozen importlib._bootstrap>", line 321, in _call_with_frames_removed File "/home/denny/workspace/teenvestor/core/migrations/0003_auto_20141017_1749.py", line 7, in <module> class Migration(migrations.Migration): File "/home/denny/workspace/teenvestor/core/migrations/0003_auto_20141017_1749.py", line 46, in Migration preserve_default=True, TypeError: __init__() got an unexpected keyword argument 'preserve_default' 
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Django can't automatically generate data migrations for you, as it does with schema migrations, but it's not very hard to write them. Migration files in Django are made up of Operations, and the main operation you use for data migrations is RunPython .
migrate, which is responsible for applying migrations, as well as unapplying and listing their status. makemigrations, which is responsible for creating new migrations based on the changes you have made to your models.
Django 1.7.1 added support for the preserve_default param in AlterField. Therefore an upgrade of Django from version 1.7 will resolve the issue.
pip install django --upgrade python manage.py migrate
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