Python Django`migrate`命令失败,原因是:ValueError:int()的文本无效,以10为基数:''&引用;IntegerField";

Python Django`migrate`命令失败,原因是:ValueError:int()的文本无效,以10为基数:''&引用;IntegerField";,python,django,django-models,Python,Django,Django Models,你能给我解释一下吗?为什么这是我的模特?我收到以下错误消息:ValueError:以10为基数的int()的文本无效:“” 您正试图通过int()模型中的某个地方将字符串转换为整数。IntegerField失败,因为int()不知道如何处理字符串 要解决此问题,请确保您的数据输入都是整数或数字。您在评论中发布了以下日志: >python manage.py migrate Operations to perform: Apply all migrations: admin, auth,

你能给我解释一下吗?为什么这是我的模特?我收到以下错误消息:ValueError:以10为基数的int()的文本无效:“”


您正试图通过
int()
模型中的某个地方将字符串转换为整数。IntegerField失败,因为
int()
不知道如何处理字符串


要解决此问题,请确保您的数据输入都是整数或数字。

您在评论中发布了以下日志:

>python manage.py migrate
Operations to perform:
  Apply all migrations: admin, auth, contacts, contenttypes, sessions
Running migrations:
  Applying contacts.0003_contact_nomor_hp...Traceback (most recent call last):
  File "manage.py", line 15, in <module>
    execute_from_command_line(sys.argv)
  File "C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\core\management\__init__.py", line 381, in execute_from_command_line
    utility.execute()
  File "C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\core\management\__init__.py", line 375, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\core\management\base.py", line 316, in run_from_argv
    self.execute(*args, **cmd_options)
  File "C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\core\management\base.py", line 353, in execute
    output = self.handle(*args, **options)
  File "C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\core\management\base.py", line 83, in wrapped
    res = handle_func(*args, **kwargs)
  File "C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\core\management\commands\migrate.py", line 203, in handle
    fake_initial=fake_initial,
  File "C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\db\migrations\executor.py", line 117, in migrate
    state = self._migrate_all_forwards(state, plan, full_plan, fake=fake, fake_initial=fake_initial)
  File "C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\db\migrations\executor.py", line 147, in _migrate_all_forwards
    state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)
  File "C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\db\migrations\executor.py", line 244, in apply_migration
    state = migration.apply(state, schema_editor)
  File "C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\db\migrations\migration.py", line 124, in apply
    operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
  File "C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\db\migrations\operations\fields.py", line 84, in database_forwards
    field,
  File "C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\db\backends\mysql\schema.py", line 42, in add_field
    super().add_field(model, field)
  File "C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\db\backends\base\schema.py", line 421, in add_field
    definition, params = self.column_sql(model, field, include_default=True)
  File "C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\db\backends\base\schema.py", line 168, in column_sql
    default_value = self.effective_default(field)
  File "C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\db\backends\base\schema.py", line 239, in effective_default
    return field.get_db_prep_save(default, self.connection)
  File "C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\db\models\fields\__init__.py", line 790, in get_db_prep_save
    return self.get_db_prep_value(value, connection=connection, prepared=False)
  File "C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\db\models\fields\__init__.py", line 785, in get_db_prep_value
    value = self.get_prep_value(value)
  File "C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\db\models\fields\__init__.py", line 1807, in get_prep_value
    return int(value)
ValueError: invalid literal for int() with base 10: ''
>python manage.py迁移
要执行的操作:
应用所有迁移:管理、身份验证、联系人、内容类型、会话
运行迁移:
正在应用contacts.0003\u contact\u nomor\u hp…回溯(最近一次呼叫最后一次):
文件“manage.py”,第15行,在
从命令行(sys.argv)执行命令
文件“C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site packages\django\core\management\\ uuuuuuuuuuuuuuuuuu init.py”,第381行,从命令行执行
utility.execute()
文件“C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site packages\django\core\management\\ uuuuuu init\uuuuuu.py”,第375行,在execute中
self.fetch_命令(子命令)。从_argv(self.argv)运行_
文件“C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site packages\django\core\management\base.py”,第316行,从\u argv运行
self.execute(*args,**cmd_选项)
文件“C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site packages\django\core\management\base.py”,第353行,执行
输出=self.handle(*args,**选项)
文件“C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site packages\django\core\management\base.py”,第83行,以包装形式
res=句柄函数(*args,**kwargs)
文件“C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site packages\django\core\management\commands\migrate.py”,第203行,位于句柄中
假首字母=假首字母,
文件“C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site packages\django\db\migrations\executor.py”,第117行,在migrate中
状态=self.\u迁移\u所有\u转发(状态,计划,完整计划,假=假,假首字母=假首字母)
文件“C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site packages\django\db\migrations\executor.py”,第147行,全部向前迁移
state=self.apply\u迁移(state,migration,false=false,false\u initial=false\u initial)
文件“C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site packages\django\db\migrations\executor.py”,第244行,在apply\u migration中
state=migration.apply(状态,模式编辑器)
文件“C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site packages\django\db\migrations\migration.py”,第124行,应用
操作。数据库转发(self.app\u标签、模式编辑器、旧状态、项目状态)
数据库中第84行的文件“C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site packages\django\db\migrations\operations\fields.py”
领域
文件“C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site packages\django\db\backends\mysql\schema.py”,第42行,在add\u字段中
super().添加_字段(模型,字段)
文件“C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site packages\django\db\backends\base\schema.py”,第421行,在add\u字段中
定义,params=self.column\u sql(模型,字段,include\u默认值=True)
文件“C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site packages\django\db\backends\base\schema.py”,第168行,sql列
默认值=自生效默认值(字段)
文件“C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site packages\django\db\backends\base\schema.py”,第239行,默认有效
返回字段.get\u db\u prep\u save(默认,self.connection)
文件“C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site packages\django\db\models\fields\\ uuu init\uuu.py”,第790行,位于get\u db\u prep\u save中
返回self.get_db_prep_值(值,connection=connection,prepared=False)
文件“C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site packages\django\db\models\fields\\ uuuu init\uuuuu.py”,第785行,位于get\u db\u prep\u值中
value=self.get\u prep\u值(value)
文件“C:\Users\Heri Prastio\AppData\Local\Programs\Python\Python37-32\lib\site packages\django\db\models\fields\\ uuuuu init\uuuuu.py”,第1807行,在get\u prep\u值中
返回int(值)
ValueError:基数为10的int()的文本无效:“”
问题可能是数据库中已有一些数据,因此无法添加列
nomor\u hp

这里有两个选项:

  • 向该字段添加默认值(
    IntegerField(默认值=0)
  • 使字段为空(
    IntegerField(null=True,blank=True)

  • 我怀疑发生的是这件事。您在您的
    联系人
    型号中添加了
    nomor\u hp
    字段。然后运行
    makemigrations
    ,得到如下输出:

    You are trying to add a non-nullable field 'num' to foo without a default; we can't do that (the database needs something to populate existing rows).
    Please select a fix:
     1) Provide a one-off default now (will be set on all existing rows with a null value for this column)
     2) Quit, and let me add a default in models.py
    Select an option: 1
    Please enter the default value now, as valid Python
    The datetime and django.utils.timezone modules are available, so you can do e.g. timezone.now
    Type 'exit' to exit this prompt
    
    您可能选择了1(如上所述),然后只需按enter键或
    '
    。由于
    '
    不是整数,因此
    迁移
    会因您发布的消息而失败。要做的是:

    1) 将Contact.nomor\u hp字段固定到此
    nomor\u hp=models.IntegerField(默认值=None)

    2) 再次运行makemigrations

    3) 编辑有问题的迁移文件(您可以在跟踪输出中找到),在您的情况下,它是
    0003\u contact\u nomor\u hp.py
    文件。在该文件中,您应该更改

       operations = [
            migrations.AddField(
                model_name='contact',
                name='nomor_hp',
                field=models.IntegerField(default=''),
                preserve_default=False,
            ),
        ]
    
    …到

       operations = [
            migrations.AddField(
                model_name='contact',
                name='nomor_hp',
                field=models.IntegerField(default=0),
                preserve_default=False,
            ),
        ]
    
    4) 运行
    migrate


    那你应该很好。

    你的模特看起来不错。您能发布错误的完整跟踪吗?问题不在于此代码。显示使用此模型的零件,以及
       operations = [
            migrations.AddField(
                model_name='contact',
                name='nomor_hp',
                field=models.IntegerField(default=0),
                preserve_default=False,
            ),
        ]