我正在尝试构建Web服务,但是我坚持使用我的模型。我做了一个“用户”模型,它有一个ListField()作为照片,“照片”是一个嵌入式文档。但是在保存此用户对象时,我得到一个错误:
Traceback (most recent call last):
File "E:\Challenge\trial\services\workspace\Service\src\appservices\trial.py",
line 7, in <module>
likedBy=["Name1", "Name2", "Name3", "Name4"]))
File "E:\Challenge\trial\Python27\lib\site-packages\djangotoolbox\fields.py",
line 253, in __init__
super(EmbeddedModelField, self).__init__(*args, **kwargs)
TypeError: __init__() got an unexpected keyword argument 'likedBy'
下面是我的模型文件:
from django.db import models
from djangotoolbox.fields import ListField, EmbeddedModelField
class User(models.Model):
username = models.CharField(max_length=100, blank=False, unique = True)
fname = models.CharField(max_length=100, blank=False)
lname = models.CharField(max_length=100, blank=True)
photos = ListField() #embedded list of photos uploaded by users
created = models.DateTimeField(auto_now_add=True)
def __unicode__(self):
return self.name
class Photo(EmbeddedModelField):
description = models.TextField()
link = models.TextField()
like = models.IntegerField
likedBy = ListField()
def __unicode__(self):
return self.name
我尝试保存User对象的方式是:
user = User(username="username", fname="Harshal", lname="Tripathi")
user.photos.append(Photo(description="This is a great photo uploaded for trial", link="http://image.com/images/user_photo.jpg", like="365", likedBy=["Name1", "Name2", "Name3", "Name4"]))
user.save()
在我看来,这无非是一个普通的Python问题。您已经从EmbeddedModelField继承了子类,但是尚未覆盖子类中的init方法。结果,当实例化提供特定于您的子类的参数的类时,这些参数将直接馈送到基类的init,然后该init被炸掉。
Django文档一目了然,您将要覆盖init并处理特定于类的args / kwargs,并将所有通用/通用参数传递给基类(以下示例下面的文档摘录)。
我不是Django开发人员,也没有时间安装和设置它,但是根据您上面提供的代码,我希望以下内容能正常工作,除非Django固有的某些我不愿意或不愿意做的事情文档一目了然。
from django.db import models
from djangotoolbox.fields import ListField, EmbeddedModelField
class User(models.Model):
username = models.CharField(max_length=100, blank=False, unique = True)
fname = models.CharField(max_length=100, blank=False)
lname = models.CharField(max_length=100, blank=True)
photos = ListField() #embedded list of photos uploaded by users
created = models.DateTimeField(auto_now_add=True)
def __unicode__(self):
return self.name
class Photo(EmbeddedModelField):
description = models.TextField()
link = models.TextField()
like = models.IntegerField
likedBy = ListField()
def __init__(self, link=None, like=None, likedBy=None, *args, **kwargs):
super(Photo, self).__init__(*args, **kwargs)
self.link = link or self.link
self.like = like or self.like
self.likedBy = likedBy or self.likedBy
def __unicode__(self):
return self.name
编写一个字段子类
在规划Field子类时,首先要考虑一下新字段与哪个现有Field类最相似。您可以继承现有的Django字段并为自己节省一些工作吗?如果不是,则应该对Field类进行子类化,从该类继承所有子类。
初始化新字段是要从通用参数中分离出特定于您案例的所有参数,然后将通用参数传递给Field(或您的父类)的__init __()方法。
在我们的示例中,我们将其称为字段HandField。(将Field子类称为Field是一个好主意,因此很容易将其标识为Field子类。)它的行为不像任何现有字段,因此我们直接从Field进行子类化:
from django.db import models
class HandField(models.Field):
description = "A hand of cards (bridge style)"
def __init__(self, *args, **kwargs):
kwargs['max_length'] = 104
super(HandField, self).__init__(*args, **kwargs)
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