Django-model_to_dict的用法

def model_to_dict(instance, fields=None, exclude=None):
    """
    Return a dict containing the data in ``instance`` suitable for passing as
    a Form's ``initial`` keyword argument.

    ``fields`` is an optional list of field names. If provided, return only the
    named.

    ``exclude`` is an optional list of field names. If provided, exclude the
    named from the returned dict, even if they are listed in the ``fields``
    argument.
    """
    opts = instance._meta
    data = {}
    for f in chain(opts.concrete_fields, opts.private_fields, opts.many_to_many):
        if not getattr(f, 'editable', False):
            continue
        if fields is not None and f.name not in fields:
            continue
        if exclude and f.name in exclude:
            continue
        data[f.name] = f.value_from_object(instance)
    return data

from django.forms.models import model_to_dict
di = model_to_dict(order, exclude=［'create_time', 'update_time'］)

源码函数声明：def model_to_dict(instance, fields=None, exclude=None):
其中参数instance是对象实例，fields是指定需要哪些字段，exclude是指定排除哪些字段，exclude比fields优先级高。

这样查到某个实例后懒得去看model定义就可以直接用这个方法看有哪些字段了

重点：此时字典只包含django对象的直接对象

此model_to_dict函数不返回带有editable=False(因为它用于表单)的字段.

相关资料：

如何将Django Model对象转换为字典并仍然拥有其外键？