Django：TypeError：int() 参数必须是字符串、类似字节的对象或数字，而不是

Question

请帮忙！我尝试寻找答案，但我认为这个问题过于具体，无法提供足够通用的解决方案。

我很难准确指出这个错误是什么时候开始的。我现在尝试了太多更改，不知道该站点上次工作的时间。我对此很陌生。并且完全是自学的。我可以向你保证，这将是显而易见的。

尝试迁移时收到此错误：

when attempting to migrate I receive this error:

     Apply all migrations: admin, auth, contenttypes, purchase_log, sessions
Running migrations:
  Applying purchase_log.0009_auto_20161005_1524...Traceback (most recent call la
  File "manage.py", line 22, in <module>
    execute_from_command_line(sys.argv)
  File "C:\Users\jdcar\AppData\Local\Programs\Python\Python35-32\lib\site-packag
    utility.execute()
  File "C:\Users\jdcar\AppData\Local\Programs\Python\Python35-32\lib\site-packag
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "C:\Users\jdcar\AppData\Local\Programs\Python\Python35-32\lib\site-packag
    self.execute(*args, **cmd_options)
  File "C:\Users\jdcar\AppData\Local\Programs\Python\Python35-32\lib\site-packag
    output = self.handle(*args, **options)
  File "C:\Users\jdcar\AppData\Local\Programs\Python\Python35-32\lib\site-packag
    fake_initial=fake_initial,
  File "C:\Users\jdcar\AppData\Local\Programs\Python\Python35-32\lib\site-packag
    state = self._migrate_all_forwards(state, plan, full_plan, fake=fake, fake_i
  File "C:\Users\jdcar\AppData\Local\Programs\Python\Python35-32\lib\site-packag
    state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_
  File "C:\Users\jdcar\AppData\Local\Programs\Python\Python35-32\lib\site-packag
    state = migration.apply(state, schema_editor)
  File "C:\Users\jdcar\AppData\Local\Programs\Python\Python35-32\lib\site-packag
    operation.database_forwards(self.app_label, schema_editor, old_state, projec
  File "C:\Users\jdcar\AppData\Local\Programs\Python\Python35-32\lib\site-packag
    field,
  File "C:\Users\jdcar\AppData\Local\Programs\Python\Python35-32\lib\site-packag
    self._remake_table(model, create_fields=[field])
  File "C:\Users\jdcar\AppData\Local\Programs\Python\Python35-32\lib\site-packag
    self.effective_default(field)
  File "C:\Users\jdcar\AppData\Local\Programs\Python\Python35-32\lib\site-packag
    default = field.get_db_prep_save(default, self.connection)
  File "C:\Users\jdcar\AppData\Local\Programs\Python\Python35-32\lib\site-packag
    return self.target_field.get_db_prep_save(value, connection=connection)
  File "C:\Users\jdcar\AppData\Local\Programs\Python\Python35-32\lib\site-packag
    prepared=False)
  File "C:\Users\jdcar\AppData\Local\Programs\Python\Python35-32\lib\site-packag
    value = self.get_prep_value(value)
  File "C:\Users\jdcar\AppData\Local\Programs\Python\Python35-32\lib\site-packag
    return int(value)
TypeError: int() argument must be a string, a bytes-like object or a number, not

我快疯了，不知道从哪里开始！请帮忙！

编辑：这里是 .models.py

from django.db import models
from django.contrib.auth.models import User


class Store(models.Model):
    name = models.CharField(max_length=250)
    owner = models.ForeignKey(User)

    def __str__(self):
        return self.name


class Product(models.Model):
    type = models.CharField(max_length=250)
    owner = models.ForeignKey(User)

    def __str__(self):
        return self.type


class Receipt(models.Model):
    store = models.ForeignKey(Store)
    date = models.DateField()
    line_items = models.ManyToManyField(Product, through='ReceiptProduct')
    owner = models.ForeignKey(User)

    def __str__(self):
        return self.store.name + ': ' + str(self.date)


class ReceiptProduct(models.Model):
    receipt = models.ForeignKey(Receipt)
    product = models.ForeignKey(Product)
    price = models.FloatField()
    sale = models.BooleanField()
    description = models.CharField(max_length=500, null=True, blank=True)
    owner = models.ForeignKey(User)

    def __str__(self):
        return self.product.type

编辑：这里是迁移 0009_auto_20161005_1524.py

# -*- coding: utf-8 -*-
# Generated by Django 1.10.1 on 2016-10-05 19:24
from __future__ import unicode_literals

from django.conf import settings
import django.contrib.auth.models
from django.db import migrations, models
import django.db.models.deletion


class Migration(migrations.Migration):

    dependencies = [
        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
        ('purchase_log', '0008_receiptproduct_sale'),
    ]

    operations = [
        migrations.AddField(
            model_name='product',
            name='owner',
            field=models.ForeignKey(default=django.contrib.auth.models.User, on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL),
        ),
        migrations.AddField(
            model_name='receipt',
            name='owner',
            field=models.ForeignKey(default=django.contrib.auth.models.User, on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL),
        ),
        migrations.AddField(
            model_name='receiptproduct',
            name='owner',
            field=models.ForeignKey(default=django.contrib.auth.models.User, on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL),
        ),
        migrations.AddField(
            model_name='store',
            name='owner',
            field=models.ForeignKey(default=django.contrib.auth.models.User, on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL),
        ),
    ]

Answer 1

感谢@MosesKoledoye，问题解决了。

我删除了导致问题的应用程序内的迁移文件夹。并通过运行“python manage.py makemigrations <appname>”重新创建它，然后我迁移到服务器，一切都很好。

谢谢你，@MosesKoledoye

Answer 2

这并没有回答最初的问题，但它可能会帮助其他根据标题最终来到这里的人。

获取此错误消息的多种方法之一是使用get_or_create()，而忘记它实际上返回tuple，如下例所示。

foo = Foo.objects.get_or_create(some_attribute='something')  # foo is actually a tuple...
Bar.objects.get_or_create(foo=foo)  # this will raise the error

对get_or_create() 的第二次调用引发了错误（至少在 Django 2.2 中）：

TypeError: int() argument must be a string, a bytes-like object or a number, not 'Foo'

在我看来，这条消息不是很有帮助。请注意，对Bar.objects.create()（而不是get_or_create()）的类似（错误）调用确实会产生非常清晰的错误消息。

这种情况下的解决方法很简单：

foo, created = Foo.objects.get_or_create(...