django 将模型实例转换为 dict

Question

我是 Django 的初学者。我需要将 Model 实例转换为类似于 Model.objects.values 的字典，并带有关系字段。所以我写了一个小函数来做到这一点:

def _get_proper(instance, field):
    if field.__contains__("__"):
        inst_name = field.split("__")[0]
        new_inst = getattr(instance, inst_name)
        next_field = "__".join(field.split("__")[1:])
        value = _get_proper(new_inst, next_field)
    else:
        value = getattr(instance, field)

    return value

def instance_to_dict(instance, fields):
    return {key: _get_proper(instance, key) for key in fields}

所以，我可以这样使用它:

user_obj = User.objects.select_related(...).get(...)
print instance_to_dict(user_obj, ["name", "city__name", "city_id"])

你能提出更好的解决方案吗？谢谢!
附言对不起我的英语不好。

Answer 1

This actually already exists in Django, but its not widely documented.

from django.forms import model_to_dict
my_obj = User.objects.first()
model_to_dict(my_obj,
    fields = [...], # fields to include
    exclude =  [...], # fields to exclude
)