ValueError：字段“id”需要一个数字但得到“处理”

Question

我将在 DigitalOcean 上部署我的 django 应用程序。一切顺利，除了以下错误，我的问题是：我在哪里可以找到这个错误的来源，实际上是在哪个文件中？

Operations to perform:
  Apply all migrations: admin, auth, ccapp, contenttypes, sessions
Running migrations:
  Applying ccapp.0009_auto_20191207_2148...Traceback (most recent call last):
  File "/home/progbash/ccproject/env/lib/python3.6/site-packages/django/db/models/fields/__init__.py", line 1768, in get_prep_value
    return int(value)

ValueError: invalid literal for int() with base 10: 'Processing'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "manage.py", line 21, in <module>
    main()
  File "manage.py", line 17, in main
    execute_from_command_line(sys.argv)
  File "/home/progbash/ccproject/env/lib/python3.6/site-packages/django/core/management/__init__.py", line 401, in execute_from_command_line
    utility.execute()
  File "/home/progbash/ccproject/env/lib/python3.6/site-packages/django/core/management/__init__.py", line 395, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
...
  File "/home/progbash/ccproject/env/lib/python3.6/site-packages/django/db/models/fields/__init__.py", line 2361, in get_db_prep_value
    value = self.get_prep_value(value)
  File "/home/progbash/ccproject/env/lib/python3.6/site-packages/django/db/models/fields/__init__.py", line 1772, in get_prep_value
    ) from e
ValueError: Field 'id' expected a number but got 'Processing'.

models.py：

from datetime import datetime

# Create your models here.
class Question(models.Model):
    question_text = models.TextField(max_length=200)
    answer = models.TextField(max_length=200)

    def __str__(self):
        return self.question_text

class ApplicantStatus(models.Model):
    class Meta:
        verbose_name_plural = "Applicant Statuses"

    name = models.CharField(max_length=30)

    def __str__(self):
        return self.name

class Applicant(models.Model):
    name = models.CharField(max_length=20)
    surname = models.CharField(max_length=30)
    birth_date = models.DateField(blank=False)
    phone = models.CharField(max_length=15)
    email = models.EmailField(max_length=40)
    motivation_letter = models.TextField(max_length=200)
    status = models.ForeignKey(ApplicantStatus, on_delete=models.CASCADE, default=3)
    photo = models.FileField(upload_to='static/applicant_photos', blank=True)

    def __str__(self):
        return self.name


class Message(models.Model):
    message_text = models.CharField(max_length=200)
    sender_name = models.CharField(max_length=30)
    sender_email = models.EmailField(max_length=50)

    def __str__(self):
        return self.sender_name

Answer 1

只是为了分享处理我收到的类似错误的解决方案：在我的例子中，收到了同样的错误，因为我直接使用字段值创建模型实例，而不指定字段名称，所以 ID 总是采用第一个为默认值（ID=field1）。通过将属性名称也添加到即时创建中解决了这个问题。

曾是：

model_instant = YourModel(field1, field2,...etc)

解决方法：

model_instant = YourModel(field1 = field1, field2 = field2,...etc)

执行此操作，然后按照上面建议的操作：1）删除 dB 文件，2）删除迁移，然后 3）执行 makemigrations your_app_name，然后 4）迁移，然后 5）运行服务器，您应该可以开始了。

Answer 2

只需删除除init python文件之外的所有迁移文件，然后运行 ​​python manage.py makemigrations 然后 python manage.py migrate

Answer 3

问题出在迁移文件中。我刚刚打开并将默认值从字符串类型更改为整数。

Answer 4

从迁移文件中，我们可以找到以(001_initial.py,002_auto.py,003_,004_)开头的文件。在这些文件中，将默认值空字符串 (default= '') 或 django.utils.timezone.now() 替换为整数，例如 (default=1)。它可能会解决问题。