[英]django - TypeError: expected string or buffer
您好,我向模型添加了一个字段,当我尝试在终端中进行migrate
,它给了我这个错误,有人知道这可能是什么吗?
================================================== ========================
File "manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "/Users/Derek/.virtualenvs/tasks/lib/python2.7/site-packages/django/core/management/__init__.py", line 385, in execute_from_command_line
utility.execute()
File "/Users/Derek/.virtualenvs/tasks/lib/python2.7/site-packages/django/core/management/__init__.py", line 377, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/Users/Derek/.virtualenvs/tasks/lib/python2.7/site-packages/django/core/management/base.py", line 288, in run_from_argv
self.execute(*args, **options.__dict__)
File "/Users/Derek/.virtualenvs/tasks/lib/python2.7/site-packages/django/core/management/base.py", line 338, in execute
output = self.handle(*args, **options)
File "/Users/Derek/.virtualenvs/tasks/lib/python2.7/site-packages/django/core/management/commands/migrate.py", line 161, in handle
executor.migrate(targets, plan, fake=options.get("fake", False))
File "/Users/Derek/.virtualenvs/tasks/lib/python2.7/site-packages/django/db/migrations/executor.py", line 68, in migrate
self.apply_migration(migration, fake=fake)
File "/Users/Derek/.virtualenvs/tasks/lib/python2.7/site-packages/django/db/migrations/executor.py", line 102, in apply_migration
migration.apply(project_state, schema_editor)
File "/Users/Derek/.virtualenvs/tasks/lib/python2.7/site-packages/django/db/migrations/migration.py", line 108, in apply
operation.database_forwards(self.app_label, schema_editor, project_state, new_state)
File "/Users/Derek/.virtualenvs/tasks/lib/python2.7/site-packages/django/db/migrations/operations/fields.py", line 139, in database_forwards
schema_editor.alter_field(from_model, from_field, to_field)
File "/Users/Derek/.virtualenvs/tasks/lib/python2.7/site-packages/django/db/backends/schema.py", line 454, in alter_field
self._alter_field(model, old_field, new_field, old_type, new_type, old_db_params, new_db_params, strict)
File "/Users/Derek/.virtualenvs/tasks/lib/python2.7/site-packages/django/db/backends/sqlite3/schema.py", line 199, in _alter_field
self._remake_table(model, alter_fields=[(old_field, new_field)])
File "/Users/Derek/.virtualenvs/tasks/lib/python2.7/site-packages/django/db/backends/sqlite3/schema.py", line 137, in _remake_table
self.create_model(temp_model)
File "/Users/Derek/.virtualenvs/tasks/lib/python2.7/site-packages/django/db/backends/schema.py", line 212, in create_model
definition, extra_params = self.column_sql(model, field)
File "/Users/Derek/.virtualenvs/tasks/lib/python2.7/site-packages/django/db/backends/schema.py", line 124, in column_sql
default_value = self.effective_default(field)
File "/Users/Derek/.virtualenvs/tasks/lib/python2.7/site-packages/django/db/backends/schema.py", line 187, in effective_default
default = field.get_db_prep_save(default, self.connection)
File "/Users/Derek/.virtualenvs/tasks/lib/python2.7/site-packages/django/db/models/fields/__init__.py", line 627, in get_db_prep_save
prepared=False)
File "/Users/Derek/.virtualenvs/tasks/lib/python2.7/site-packages/django/db/models/fields/__init__.py", line 1290, in get_db_prep_value
value = self.get_prep_value(value)
File "/Users/Derek/.virtualenvs/tasks/lib/python2.7/site-packages/django/db/models/fields/__init__.py", line 1269, in get_prep_value
value = super(DateTimeField, self).get_prep_value(value)
File "/Users/Derek/.virtualenvs/tasks/lib/python2.7/site-packages/django/db/models/fields/__init__.py", line 1171, in get_prep_value
return self.to_python(value)
File "/Users/Derek/.virtualenvs/tasks/lib/python2.7/site-packages/django/db/models/fields/__init__.py", line 1228, in to_python
parsed = parse_datetime(value)
File "/Users/Derek/.virtualenvs/tasks/lib/python2.7/site-packages/django/utils/dateparse.py", line 70, in parse_datetime
match = datetime_re.match(value)
TypeError: expected string or buffer
模型.py
class Lead(models.Model):
title = models.CharField(choices=TITLE_CHOICES, max_length=20, blank=True, default='')
first_name = models.CharField(max_length=80, blank=True, default='')
last_name = models.CharField(max_length=80, blank=True)
company = models.CharField(max_length=80, blank=True)
position = models.CharField(max_length=50, blank=True, default='')
location = models.CharField(max_length=100, blank=True)
currently_using_sms = models.CharField(choices=CURRENTLY_USING_SMS, default='', max_length=30)
services_interested_in = models.ManyToManyField(Services)
phone_number = models.CharField(blank=True, max_length=20, default='')
mobile_number = models.CharField(blank=True, max_length=11, default='')
email = models.EmailField(blank='True', default='')
best_day_to_contact = models.DateTimeField(blank=False, null=True)
notes = models.TextField(blank=True)
assign_to = models.ForeignKey(User, db_index=True, blank=True, null=True, default=None)
lead_source = models.ForeignKey(LeadSource, db_index=True, blank=True, null=True)
status = models.CharField(choices=LEAD_STATUS, max_length=100, default='1')
Django 的DateTimeField
通常适用于 Python datetime
和date
对象,但有一个未公开的特性,即能够自动将字符串解析为datetime
对象。 在您的DateTimeField
声明中,您有
default=False
这既不是datetime
也不是date
。 因此,Django 会尝试自动为您解析它。 如果不这样做,它会发出神秘的消息。
根据您的特定需要,您应该替换或删除default=False
参数。
我相信您在以下行的default=False
中有错误:
completion_date = models.DateTimeField(blank=False, null=True, default=False)
False
不是default
预期的有效日期。 请改用default=datetime.now
。
我以前也有同样的问题。 我试过 default=False 但它没有做任何改变。 然后我添加 default=timezone.now,它工作正常。 唯一的问题是日期字段未显示在管理部分。
更改此字段:
best_day_to_contact = models.DateTimeField(blank=False, null=True)
到这个领域:
from django.utils import timezone
best_day_to_contact = models.DateTimeField(default=timezone.now)
我想也许你的问题会用这个解决方案解决。
/* Example Model */
class user(models.Model):
created = models.DateField(auto_now_add=True)
def __str__(self):
return str(self.id)
/*When you generate migrations file then it will add (default=1)
*Remove default=1
*field=models.DateField(default=1, auto_now_add=True),
*To
*field=models.DateField(auto_now_add=True)
*Then do sqlmigrate or migrate.
*/
只是想权衡一下,因为这个问题让我很头疼。 在我添加了一个 models.DateField 之后,Django 陷入了一个糟糕的迁移。 直到我删除所有迁移并重新运行 makemigrations 后,它才自行修复。
希望这可以帮助!
要解决此问题,您可能需要返回文本编辑器并删除所有迁移。 它通常发生在 django 进行不良迁移时。 之后重新进行新的迁移。 希望这能解决你的问题
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.