如何通过字段名称获取相关对象？

Question

I have these models:

class Category(models.Model):
        name =   models.CharField(blank=True)

class Element(models.Model):
    name =   models.CharField(blank=True)
    categories = models.ManyToManyField(Category, related_name='places', blank=False, null=True)

How to get all categories by name of field?

element._meta.get_field('category') return ManyToManyField. How to get all categories from this object

UPD: I need an access by name: I iterated by field names and collect related objects.

Example:

names = []
for field_name in ['categories', 'some_another_m2m_field_name']:
    for related_object in objects._meta.get_field(field_name).all():
        names.append(related_object.name)

thank you

Answer 1

我猜这会做到：

element._meta.get_field('categories').value_from_object(element)