И снова здравствуйте!

(studentsdb)Inmar:studentsdb miletskiy$ python manage.py migrate
Operations to perform:
  Synchronize unmigrated apps: staticfiles, messages
  Apply all migrations: admin, students, contenttypes, auth, sessions
Synchronizing apps without migrations:
  Creating tables...
    Running deferred SQL...
  Installing custom SQL...
Running migrations:
  Rendering model states... DONE
  Applying contenttypes.0001_initial... OK
  Applying auth.0001_initial... OK
  Applying admin.0001_initial... OK
  Applying contenttypes.0002_remove_content_type_name... OK
  Applying auth.0002_alter_permission_name_max_length... OK
  Applying auth.0003_alter_user_email_max_length... OK
  Applying auth.0004_alter_user_username_opts... OK
  Applying auth.0005_alter_user_last_login_null... OK
  Applying auth.0006_require_contenttypes_0002... OK
  Applying sessions.0001_initial... OK
  Applying students.0001_initial... OK
  Applying students.0002_auto_20150816_2050... OK
  Applying students.0003_remove_group_last_name... OK
  Applying students.0004_auto_20150816_2150...Traceback (most recent call last):
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/data/work/buildouts/python/studentsdb/lib/python2.7/site-packages/django/core/management/__init__.py", line 338, in execute_from_command_line
    utility.execute()
  File "/data/work/buildouts/python/studentsdb/lib/python2.7/site-packages/django/core/management/__init__.py", line 330, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/data/work/buildouts/python/studentsdb/lib/python2.7/site-packages/django/core/management/base.py", line 393, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/data/work/buildouts/python/studentsdb/lib/python2.7/site-packages/django/core/management/base.py", line 444, in execute
    output = self.handle(*args, **options)
  File "/data/work/buildouts/python/studentsdb/lib/python2.7/site-packages/django/core/management/commands/migrate.py", line 221, in handle
    executor.migrate(targets, plan, fake=fake, fake_initial=fake_initial)
  File "/data/work/buildouts/python/studentsdb/lib/python2.7/site-packages/django/db/migrations/executor.py", line 110, in migrate
    self.apply_migration(states[migration], migration, fake=fake, fake_initial=fake_initial)
  File "/data/work/buildouts/python/studentsdb/lib/python2.7/site-packages/django/db/migrations/executor.py", line 148, in apply_migration
    state = migration.apply(state, schema_editor)
  File "/data/work/buildouts/python/studentsdb/lib/python2.7/site-packages/django/db/migrations/migration.py", line 115, in apply
    operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
  File "/data/work/buildouts/python/studentsdb/lib/python2.7/site-packages/django/db/migrations/operations/fields.py", line 201, in database_forwards
    schema_editor.alter_field(from_model, from_field, to_field)
  File "/data/work/buildouts/python/studentsdb/lib/python2.7/site-packages/django/db/backends/base/schema.py", line 484, in alter_field
    old_db_params, new_db_params, strict)
  File "/data/work/buildouts/python/studentsdb/lib/python2.7/site-packages/django/db/backends/base/schema.py", line 567, in _alter_field
    new_default = self.effective_default(new_field)
  File "/data/work/buildouts/python/studentsdb/lib/python2.7/site-packages/django/db/backends/base/schema.py", line 211, in effective_default
    default = field.get_db_prep_save(default, self.connection)
  File "/data/work/buildouts/python/studentsdb/lib/python2.7/site-packages/django/db/models/fields/related.py", line 1956, in get_db_prep_save
    return self.related_field.get_db_prep_save(value, connection=connection)
  File "/data/work/buildouts/python/studentsdb/lib/python2.7/site-packages/django/db/models/fields/__init__.py", line 710, in get_db_prep_save
    prepared=False)
  File "/data/work/buildouts/python/studentsdb/lib/python2.7/site-packages/django/db/models/fields/__init__.py", line 977, in get_db_prep_value
    value = self.get_prep_value(value)
  File "/data/work/buildouts/python/studentsdb/lib/python2.7/site-packages/django/db/models/fields/__init__.py", line 985, in get_prep_value
    return int(value)
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(studentsdb)Inmar:studentsdb miletskiy$