無法分配“1”：“Plugins.category”必須是“PluginsCategory”實例。 Django 和 ForeignKey

Question

我正在嘗試將新記錄保存到數據庫中，並且在寫入 ForeignKey 時發生錯誤

無法分配“1”：“Plugins.category”必須是“PluginsCategory”實例。

怎么了？

模型.py

class Plugins(models.Model):
    title = models.CharField(max_length=150, verbose_name='Название')
    category = models.ForeignKey('PluginsCategory', on_delete=models.PROTECT, related_name='get_category')

    def get_absolute_url(self):
        return reverse('urls_view_current_plugins', kwargs={'pk': self.pk})

    def __str__(self):
        return self.title


class PluginsCategory(models.Model):
    title = models.CharField(max_length=150, db_index=True, verbose_name='Наименования категории')

    def __str__(self):
        return self.title

標簽.py

def add_plugin_in_db():
    plugin = Plugins()
    plugin.title = 'title'
    plugin.category = 1
    plugin.save(force_insert=True)

在網站上

C:\PythonProject\ServiceCRM3\venv\lib\site-packages\django\db\models\fields\related_descriptors.py, line 215, in __set__
            raise ValueError( …
▼ Local vars
Variable    Value
instance    
<Plugins: Заказы>
self    
<django.db.models.fields.related_descriptors.ForwardManyToOneDescriptor object at 0x000000000438DAF0>
value   
1

Answer 1

您將其分配給category_id字段，因此：

ef add_plugin_in_db():
    plugin = Plugins()
    plugin.title = 'title'
    plugin.category_id = 1
    plugin.save(force_insert=True)

但是，您可以使其更緊湊：

def add_plugin_in_db():
    plugin = Plugins.objects.create(
        title = 'title'
        category_id=1
    )