在Django ModelForm中传递相关对象的字段 [英] Pass related object's field in Django ModelForm

问题描述

我有一个Django模型类，该类扩展了 django.contrib.auth.models.User :

  class MyModel(models.Model):user = models.OneToOneField(User，models.CASCADE，unique = True)bio = models.TextField()date_of_birth = models.DateField() 

根据这个模型，我正在制作一个ModelForm:

  class MyModelForm(forms.ModelForm):类Meta:型号= MyModel字段= ['bio'，'date_of_birth'] 

如何告诉MyModelForm接受用户的字段，例如 username ， first_name ， last_name ?

类别Meta字段中的示例我可以添加 ['bio'，'date_of_birth'，'user'] ，但这将为我提供一个下拉列表，以选择MyModel与MyModelForm有关.

执行 ['bio'，'date_of_birth'，'user.first_name'] 会引发异常 django.core.exceptions.FieldError:未知字段(user.first_name)为MyModel指定的

这是回溯 https://pastebin.com/0T42VKEP

解决方案

我通过重写ModelForm的 __ init __ 方法找到了自己的解决方案:

  class MyModelForm(forms.ModelForm):first_name = Forms.CharField()类Meta:型号= MyModel字段= ['bio'，'date_of_birth']def __init __(self，* args，** kwargs):超级(MyModelForm，self).__ init __(* args，** kwargs)my_user = kwargs.get('instance')first_name = my_user.user.first_nameself.fields ['first_name'].initial = first_name#当我请求实例时，这将在html页面中显示名字 

当我实例化表单时，我只是将MyModel的实例作为kwarg: form = MyModelForm(instance = my_model_instance)

I have a Django model class that extends the django.contrib.auth.models.User:

class MyModel(models.Model):
  user = models.OneToOneField(User, models.CASCADE, unique=True)
  bio = models.TextField()
  date_of_birth = models.DateField()

and out of this model I'm making a ModelForm:

class MyModelForm(forms.ModelForm):

  class Meta:
    model = MyModel
    fields = ['bio', 'date_of_birth']

How can I tell the MyModelForm to take in the User's fields such as username, first_name, last_name?

Example in the class Meta fields I can add ['bio', 'date_of_birth', 'user'] but that will just provide me with the dropdown to select to whom shall the MyModel in the MyModelForm be related to.

Doing ['bio', 'date_of_birth', 'user.first_name'] throws an exception django.core.exceptions.FieldError: Unknown field(s) (user.first_name) specified for MyModel

Edit: here's the traceback https://pastebin.com/0T42VKEP

解决方案

I kinda found my own solution, by overriding ModelForm's __init__ method:

class MyModelForm(forms.ModelForm):

  first_name = forms.CharField()

  class Meta:
    model = MyModel
    fields = ['bio', 'date_of_birth']

  def __init__(self, *args, **kwargs):
    super(MyModelForm, self).__init__(*args, **kwargs)
    my_user = kwargs.get('instance')
    first_name = my_user.user.first_name
    self.fields['first_name'].initial = first_name #this will show the first name in the html page when i request the instance

And when I'm instantiating my form I just pass an instance of MyModel as a kwarg: form = MyModelForm(instance=my_model_instance)

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