Question

我正在开发一个Django项目，并使用相同模型的几个models.ForeignKey实例创建了一个模型。

class Country(models.Model):
    name = models.CharField(max_length=100)
    primary_language = models.ForeignKey('Language', related_name='primary_language', default="")
    secondary_language = models.ForeignKey('Language', related_name='secondary_language', default="")
    tertiary_language = models.ForeignKey('Language', related_name='tertiary_language', default="")

    def __str__(self):
        return self.name

这是语言模型：

class Language(models.Model):
    name = models.CharField(max_length=50)
    abbreviation = models.CharField(max_length=2)

    def __str__(self):
        return self.name

在执行$python3 manage.py makemigration base时，它运行正常，没有错误。我已经把我认为最重要的2个迁移文件放了。

class Migration(migrations.Migration):

    dependencies = [
        ('base', '0002_country_country_code'),
    ]

    operations = [
        migrations.CreateModel(
            name='Currency',
            fields=[
                ('id', models.AutoField(serialize=False, auto_created=True, verbose_name='ID', primary_key=True)),
                ('name', models.CharField(max_length=50)),
                ('abbreviation', models.CharField(max_length=3)),
            ],
        ),
        migrations.CreateModel(
            name='Language',
            fields=[
                ('id', models.AutoField(serialize=False, auto_created=True, verbose_name='ID', primary_key=True)),
                ('name', models.CharField(max_length=50)),
                ('abbreviation', models.CharField(max_length=2)),
            ],
        ),
        migrations.AddField(
            model_name='country',
            name='phone_country_code',
            field=models.CharField(default='', max_length=7),
        ),
        migrations.AlterField(
            model_name='country',
            name='country_code',
            field=models.CharField(default='', max_length=2),
        ),
        migrations.AddField(
            model_name='country',
            name='primary_language',
            field=models.ForeignKey(to='base.Language', default=''),
        ),
        migrations.AddField(
            model_name='country',
            name='secondary_language',
            field=models.ForeignKey(related_name='secondary_language', to='base.Language', default=''),
        ),
        migrations.AddField(
            model_name='country',
            name='tertiary_language',
            field=models.ForeignKey(related_name='tertiary_language', to='base.Language', default=''),
        ),
    ]

class Migration(migrations.Migration):

    dependencies = [
        ('base', '0006_auto_20151023_0918'),
    ]

    operations = [
        migrations.AddField(
            model_name='country',
            name='primary_language',
            field=models.ForeignKey(default='', related_name='primary_language', to='base.Language'),
        ),
        migrations.AddField(
            model_name='country',
            name='secondary_language',
            field=models.ForeignKey(default='', related_name='secondary_language', to='base.Language'),
        ),
        migrations.AddField(
            model_name='country',
            name='tertiary_language',
            field=models.ForeignKey(default='', related_name='tertiary_language', to='base.Language'),
        ),
        migrations.AlterField(
            model_name='language',
            name='abbreviation',
            field=models.CharField(max_length=2),
        ),
        migrations.AlterField(
            model_name='language',
            name='name',
            field=models.CharField(max_length=50),
        ),
    ]

现在，在运行迁移时，我收到一条错误消息，我无法弄清楚。我认为这些是堆栈跟踪中重要的行：

johan@johan-pc:~/sdp/gezelligehotelletjes_com$ python3 manage.py migrate
Operations to perform:
  Synchronize unmigrated apps: staticfiles, messages
  Apply all migrations: auth, base, sessions, admin, contenttypes, hotel
Synchronizing apps without migrations:
  Creating tables...
    Running deferred SQL...
  Installing custom SQL...
Running migrations:
  Rendering model states... DONE
  Applying base.0003_auto_20151023_0912...Traceback (most recent call last):
  File "/usr/local/lib/python3.4/dist-packages/django/db/backends/utils.py", line 64, in execute
    return self.cursor.execute(sql, params)
psycopg2.IntegrityError: column "primary_language_id" contains null values


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

django.db.utils.IntegrityError: column "primary_language_id" contains null values

首先，我没有专栏＆＃34; primary_language_id＆＃34;但我猜这是由Django创建的。即使删除整个语言模型和Country模型中的语言行，我仍然会收到此错误。

有人可以帮我解决这个问题吗？

Answer 1

您的数据库中已有Country个对象。

当您向其添加primary_language_id列（代表primary_language ForeignKey）时，这些国家/地区最终会显示空primary_language（因为您没有＆＃39; t指定默认值），这会引发错误（因为您不允许primary_language的空值。）

解决方案取决于您希望迁移如何工作。您可以将blank = True添加到primary_language ForeignKey定义，添加默认设置，或者在3次迁移中细分迁移（添加blank = True列，设置值，删除blank = True）。

迁移时出错：django.db.utils.IntegrityError：column＆＃34; primary_language_id＆＃34;包含空值

1 个答案: