如何将数据添加到多个字段中?

我在任何地方都找不到它,所以您的帮助对我来说将是很好的:)这是该字段:

categories = models.ManyToManyField(fragmentCategory)

碎片类别:

class fragmentCategory(models.Model):

        CATEGORY_CHOICES = (
                        ('val1', 'value1'),
                        ('val2', 'value2'),
                        ('val3', 'value3'),
                        )

        name = models.CharField(max_length=20, choices=CATEGORY_CHOICES)

<input type="checkbox" name="val1" />
<input type="checkbox" name="val2" />
<input type="checkbox" name="val3" />

我试过这样的方法:

categories = fragmentCategory.objects.get(id=1),

categories = [1,2]