Question

我正在创建一个django应用程序，用户可以在其帐户中存储多个网址。问题是，我面临的是单个用户能够存储单个网址，在添加多个网址时会出现完整性错误。 那么如何将多个网址添加到单个用户对象

models.py

class Userprofile(models.Model):
    user        = models.OneToOneField(User)    
    url         = models.CharField(max_length = 100 ,)
    shortcode   = models.CharField(max_length = 10 ,blank = True)
    timestamp   = models.DateTimeField(auto_now_add = True)

    def save(self , *args , **kwargs):
        if self.shortcode is None or self.shortcode is '':
            self.shortcode = create_shortcode(self)
            super(Userprofile, self).save(*args , **kwargs)

    def __str__(self):
        return self.user.username

forms.py

class URLForm(forms.ModelForm):
    class Meta:
       model    = Userprofile 
       fields   = ('url',)
       widgets={
       'url':forms.TextInput(attrs={'placeholder':'Long URL','class':'form-control'}),
            }

    def clean_url(self):
        url  = self.cleaned_data['url']
        url_validator = URLValidator()
    try:
        url_validator(url)
    except:
        raise forms.ValidationError('Enter a proper URL ')
    return url

Views.py

def user_url_info(request):
  if request.method == 'POST':
    form = URLForm(request.POST)
    if form.is_valid():
        # try:
        #   obj = Userprofile.objects.get(url = form.cleaned_data['url'])
        #   print('already')
        # except:
        obj = form.save(commit = False)
        obj.user = request.user
        obj.save()
        return render(request , 'detaail.html',{'obj':obj}) 
  else:
    form    = URLForm() 
return render(request , 'urlform.html' ,{'form':form})

所以我想要一个request.user可以解决Userprofile的多个对象

Answer 1

您需要为网址创建模型，并使用网址模型中的外键用户ID进行连接。存储冗余数据意味着数据库未规范化。将数据存储在这个问题中，进行了规范化，充分利用了Django的对象关系模型。

Answer 2

您可以将url字段设为外键，并创建一个新模型以仅存储url

class UserURL(models.Model):    
    url = models.CharField(max_length = 100 ,)



class Userprofile(models.Model):
    user        = models.OneToOneField(User)    
    url         = models.Foreignkey(UserURL)
    shortcode   = models.CharField(max_length = 10 ,blank = True)
    timestamp   = models.DateTimeField(auto_now_add = True)

Answer 3

如果您询问如何将用户与多个网址相关联，则不应该执行OneToOne字段。

class UserUrlRelationship(models.Model):
    url = models.CharField(...)
    user = models.ManyToManyField(User)

或

class Url(models.Model):
    url = models.CharField(...)

class UserUrlRelationship(models.Model):
    url = models.ForeignKey(Url)
    user = models.ForeignKey(User)
    # This is literally what a ManyToManyField does in the background.
    # If you investigate the database, you will see extra tables that
    # represent your many to many fields. each entry is a relationship. Make sure that you
    # don't have unique constraints on these 2 fields via OneToManyFields,
    # OneToOneFields or unique=True.

不要对OneToOne字段进行限制，否则会限制您，以便一个用户只能映射到一个URL，而另一个用户只能映射到一个url（一个url只有一个用户）。

django - 单个用户对象可以存储多个模型对象

3 个答案: