*I meet some errors when I migrate database, and the error code is
following:*
> Operations to perform:
> Synchronize unmigrated apps: staticfiles, messages
> Apply all migrations: admin, contenttypes, api, auth, sessions
> Synchronizing apps without migrations:
> Creating tables...
> Running deferred SQL...
> Installing custom SQL...
> Running migrations:
> Rendering model states... DONE
> Applying api.0004_auto_20151119_1545...Traceback (most recent call last
> ):
> File "manage.py", line 10, in <module>
> execute_from_command_line(sys.argv)
> File
> "/Library/Python/2.7/site-packages/django/core/management/__init__.py",
> line 354, in execute_from_command_line
> utility.execute()
> File
> "/Library/Python/2.7/site-packages/django/core/management/__init__.py",
> line 346, in execute
> self.fetch_command(subcommand).run_from_argv(self.argv)
> File "/Library/Python/2.7/site-packages/django/core/management/base.py",
> line 394, in run_from_argv
> self.execute(*args, **cmd_options)
> File "/Library/Python/2.7/site-packages/django/core/management/base.py",
> line 445, in execute
> output = self.handle(*args, **options)
> File
> "/Library/Python/2.7/site-packages/django/core/management/commands/migrate.py"
> , line 222, in handle
> executor.migrate(targets, plan, fake=fake, fake_initial=fake_initial)
> File
> "/Library/Python/2.7/site-packages/django/db/migrations/executor.py",
> line 110, in migrate
> self.apply_migration(states[migration], migration, fake=fake,
> fake_initial=fake_initial)
> File
> "/Library/Python/2.7/site-packages/django/db/migrations/executor.py",
> line 148, in apply_migration
> state = migration.apply(state, schema_editor)
> File
> "/Library/Python/2.7/site-packages/django/db/migrations/migration.py",
> line 115, in apply
> operation.database_forwards(self.app_label, schema_editor, old_state,
> project_state)
> File
> "/Library/Python/2.7/site-packages/django/db/migrations/operations/fields.py"
> , line 62, in database_forwards
> field,
> File
> "/Library/Python/2.7/site-packages/django/db/backends/sqlite3/schema.py",
> line 179, in add_field
> self._remake_table(model, create_fields=[field])
> File
> "/Library/Python/2.7/site-packages/django/db/backends/sqlite3/schema.py",
> line 77, in _remake_table
> self.effective_default(field)
> File
> "/Library/Python/2.7/site-packages/django/db/backends/base/schema.py",
> line 211, in effective_default
> default = field.get_db_prep_save(default, self.connection)
> File
> "/Library/Python/2.7/site-packages/django/db/models/fields/__init__.py",
> line 710, in get_db_prep_save
> prepared=False)
> File
> "/Library/Python/2.7/site-packages/django/db/models/fields/__init__.py",
> line 1322, in get_db_prep_value
> value = self.get_prep_value(value)
> File
> "/Library/Python/2.7/site-packages/django/db/models/fields/__init__.py",
> line 1317, in get_prep_value
> return self.to_python(value)
> File
> "/Library/Python/2.7/site-packages/django/db/models/fields/__init__.py",
> line 1274, in to_python
> parsed = parse_date(value)
> File "/Library/Python/2.7/site-packages/django/utils/dateparse.py",
> line 60, in parse_date
> match = date_re.match(value)
> TypeError: expected string or buffer
> *and the code of models.py is,*
> from django.core.exceptions import ValidationError
> from django.utils.dateformat import format
> from django.contrib.auth.models import AbstractUser
> from datetime import date
> import datetime
> from django.conf import settings
> from django.db.models import Sum
> from django.utils import timezone
> from django.utils.dateformat import format
> # Create your models here.
> #Users, Contacts, Events
>
>
>
> class User(models.Model):
> phonenum = models.CharField(max_length=20)
> username = models.CharField(max_length=20)
>
> def get_usr_info(self):
> data = {} # dictionary
> data['phonenum'] = self.phonenum
> data
> data['name'] = self.username
>
>
>
>
>
> return data
>
>
>
>
>
>
>
>
> class Contacts(models.Model):
> user = models.ForeignKey(User)
>
>
>
> class UpdateEvents(models.Model):
> user = models.ForeignKey(User)
> events = models.CharField(max_length=50)
> latitude = models.CharField(max_length=10)
> longitude = models.CharField(max_length=10)
> city = models.CharField(max_length=10)
> arriveDate = models.DateTimeField(blank=True, null=True)
> leaveDate = models.DateTimeField(blank=True, null=True)
> #arriveDate = models.CharField(max_length=15, default="")
> #leaveDate = models.CharField(max_length=15, default="")
> def get_events_info(self):
> data = {}
> data['phonenum'] = self.user.phonenum
> data
> data['name'] = self.user.username
> data
> data['events'] = self.events
> data
> data['latitude'] = self.latitude
> data
> data['longitude'] = self.longitude
> data
> data['city'] = self.city
> data
> data['arriveDate'] = format(self.arriveDate, "U")
> data['leaveDate'] = format(self.leaveDate, "U")
>
> return data
>
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