Django 多项选择模型问题

Question

我在模型中有多个选择有两个不同的问题。

首先，我正在尝试进行多项选择，以便用户可以选择一周中的一天或多天:

DAYS_CHOICES = (
    (1, _('Monday')),
    ...
    (7, _('Sunday')),
)
...
day = models.ManyToManyField('day', choices=DAYS_CHOICES)

第二个问题:

我想与其他模型中定义的模型建立多对多关系:
首先(导入模型):

from events.models import Category

二(与模型相关的字段):

type = models.ManyToManyField('Category', null=True, blank=True)

我在同步数据库上收到此错误:

Error: One or more models did not validate: situ.situ: 'day' has an m2m relation with model day, which has either not been installed or is abstract.
situ.situ: 'type' has an m2m relation with model Category, which has either not been installed or is abstract.

Answer 1

你可以使用:

day = forms.ModelMultipleChoiceField(queryset=Day.objects.all())