blocks|key|3275566|text|好的，我已经解决了。似乎使用cleaned_data‘’field_name‘访问额外的字段会引发一个KeyError，但是使用cleaned_data.get('field_name')是可行的。这很奇怪，因为模型的普通字段可以通过cleaned_data‘’field_name‘来访问。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3275567|更新：不，它不工作。使用get()时，它不会引发KeyError，但会将值设置为None，因为额外的字段不在cleaned_data字典中。|offset|length|style|BOLD|3275568|下面是代码。在模板中有一个自动完成，所以在表单中有一个呈现为CharField的“艺术家”字段和一个隐藏的IntegerField，它将用给定的艺术家id自动填充。在clean_artist方法中，我希望选择艺术家对象并将其存储在表单的艺术家字段中。|3275569|models.py|3275570|class+Music(models.Model):
++++artist+=+models.ForeignKey(Artist,+related_name='music',+blank=True,+null=True)
++++#+other+fields...|code-block|syntax|javascript|3275571|forms.py|3275572|class+MusicForm(forms.ModelForm):
++++artist_id+=+forms.IntegerField(label="",+widget=forms.HiddenInput(),+required=False)
++++artist+=+forms.CharField(required=False)
++++#+other+fields+...

++++class+Meta:
++++++++model+=+Music

++++def+clean_artist(self):
++++++++if+self.cleaned_data.get('artist')+==+'':
++++++++++++artist+=+None
++++++++else:
++++++++++++artist_id+=+self.cleaned_data.get('artist_id')+#+this+returns+always+None+because+artist_id+is+not+in+cleaned_fields+(this+seemed+to+work+with+previous+django+versions+but+not+with+current+SVN+version)
++++++++++++if+artist_id+!=+None:
++++++++++++++++artist+=+Artist.objects.get(id=artist_id)
++++++++++++else:
++++++++++++++++artist+=+None

++++return+artist|3275573|entityMap^0|0|0|3|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@$D|Y|E|Z|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|10|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|11|8|@]|9|@]|A|$]]|$1|L|3|M|5|N|7|12|8|@]|9|@]|A|$O|P]]|$1|Q|3|R|5|6|7|13|8|@]|9|@]|A|$]]|$1|S|3|T|5|N|7|14|8|@]|9|@]|A|$O|P]]|$1|U|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|V|$]]

Ok I have resolved it. It seems that accessing the extra fields with cleaned_data['field_name'] raises a KeyError but using cleaned_data.get('field_name') works. That's weird because normal fields for the model can be accessed via cleaned_data['field_name'].

Update: No, it doesn't work. With get() it doesn't raise a KeyError but it sets a value of None because the extra fields are not in the cleaned_data dictionary.

Here is the code. In the templates there is an autocomplete, so in the form there is an "artist" field rendered as a CharField and an hidden IntegerField that will be autopopulated with the given artist id. In the clean_artist method I want to select the artist object and store it in the artist field of the form.

models.py

<pre><code>class Music(models.Model):
 artist = models.ForeignKey(Artist, related_name='music', blank=True, null=True)
 # other fields...
</code></pre>

forms.py

<pre><code>class MusicForm(forms.ModelForm):
 artist_id = forms.IntegerField(label="", widget=forms.HiddenInput(), required=False)
 artist = forms.CharField(required=False)
 # other fields ...

 class Meta:
 model = Music

 def clean_artist(self):
 if self.cleaned_data.get('artist') == '':
 artist = None
 else:
 artist_id = self.cleaned_data.get('artist_id') # this returns always None because artist_id is not in cleaned_fields (this seemed to work with previous django versions but not with current SVN version)
 if artist_id != None:
 artist = Artist.objects.get(id=artist_id)
 else:
 artist = None

 return artist
</code></pre>

blocks|key|319605|text|首先，你不应该有artist_id和artist字段。它们是从模型中构建的。如果你需要一些艺术家的名字，添加artist_name字段，即CharField。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|319606|此外，您正在尝试从cleaned_data中检索clean+value中的内容。可能没有您需要的数据-您应该使用来自self.data的值，其中是直接来自POST的数据。|319607|entityMap^0|1X|9|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|N|8|@]|D|@]|E|$]]]|I|$]]

First, you shouldn't have artist_id and artist fields. They are build from the model. If you need some artist name, add artist_name field, that is CharField.

Furthermore, you are trying to retrieve something from cleaned_data inside clean value. There might not be data you need - you should use values from self.data, where is data directly from POST.

blocks|key|317696|text|编辑2020+(Django+2或更高版本)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|317697|在Django+2%2B中，你可以像这样添加额外的字段：|317698|class+ProfileForm(forms.ModelForm):
++++
++++extra_field+=+forms.ImageField()

++++class+Meta:
++++++++model+=+User
++++++++fields+=+['username',+'country',+'website',+'biography']|code-block|syntax|javascript|317699|原始答案(Django+1)|317700|可以使用额外的字段扩展Django+ModelForm。假设你有一个自定义的用户模型和这个ModelForm|offset|length|style|CODE|317701|class+ProfileForm(forms.ModelForm):

++++class+Meta:
++++++++model+=+User
++++++++fields+=+['username',+'country',+'website',+'biography']|317702|现在，假设你想包括一个额外的字段(不在你的用户模型中，比方说一个图像头像)。通过执行以下操作扩展表单：|317703|from+django+import+forms

class+AvatarProfileForm(ProfileForm):

++++profile_avatar+=+forms.ImageField()

++++class+Meta(ProfileForm.Meta):
++++++++fields+=+ProfileForm.Meta.fields+%2B+('profile_avatar',)|317704|最后(假设表单有一个ImageField)，记住在视图中实例化表单时要包含request.FILES：|317705|#+(view.py)

def+edit_profile(request):
++++...
++++form+=+AvatarProfileForm(
++++++++request.POST+or+None,+
++++++++request.FILES+or+None,+
++++++++instance=request.user
++++)
++++...|317706|希望能有所帮助。祝好运!|317707|编辑：|317708|我在AvatarProfileForm.Meta.fields属性中得到一个“只能连接元组(不能连接"list")到元组”错误。将其更改为元组，它起作用了。|317709|entityMap^0|0|0|0|0|I|9|19|9|0|0|0|0|A|A|11|D|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|18|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|19|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|1A|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|1B|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|1C|8|@$M|1D|N|1E|O|P]|$M|1F|N|1G|O|P]]|9|@]|A|$]]|$1|Q|3|R|5|F|7|1H|8|@]|9|@]|A|$G|H]]|$1|S|3|T|5|6|7|1I|8|@]|9|@]|A|$]]|$1|U|3|V|5|F|7|1J|8|@]|9|@]|A|$G|H]]|$1|W|3|X|5|6|7|1K|8|@$M|1L|N|1M|O|P]|$M|1N|N|1O|O|P]]|9|@]|A|$]]|$1|Y|3|Z|5|F|7|1P|8|@]|9|@]|A|$G|H]]|$1|10|3|11|5|6|7|1Q|8|@]|9|@]|A|$]]|$1|12|3|13|5|6|7|1R|8|@]|9|@]|A|$]]|$1|14|3|15|5|6|7|1S|8|@]|9|@]|A|$]]|$1|16|3|-4|5|6|7|1T|8|@]|9|@]|A|$]]]|17|$]]

<h2>EDIT 2020 (Django 2 or higher)</h2>
In Django 2+ you can add the extra fields like this:
<pre><code>class ProfileForm(forms.ModelForm):
 
 extra_field = forms.ImageField()

 class Meta:
 model = User
 fields = ['username', 'country', 'website', 'biography']
</code></pre>
<h2>Original answer (Django 1)</h2>
It's possible to extend Django <code>ModelForm</code> with extra fields. Imagine you have a custom User model and this <code>ModelForm</code>:
<pre><code>class ProfileForm(forms.ModelForm):

 class Meta:
 model = User
 fields = ['username', 'country', 'website', 'biography']
</code></pre>
Now, imagine you want to include an extra field (not present in your User model, lets say an image avatar). Extend your form by doing this:
<pre><code>from django import forms

class AvatarProfileForm(ProfileForm):

 profile_avatar = forms.ImageField()

 class Meta(ProfileForm.Meta):
 fields = ProfileForm.Meta.fields + ('profile_avatar',)
</code></pre>
Finally (given that the form has an <code>ImageField</code>), remember to include <code>request.FILES</code> when instantiating the form in your view:
<pre><code># (view.py)

def edit_profile(request):
 ...
 form = AvatarProfileForm(
 request.POST or None, 
 request.FILES or None, 
 instance=request.user
 )
 ...
</code></pre>
Hope it helps. Good luck!
EDIT:
I was getting a &quot;can only concatenate tuple (not &quot;list&quot;) to tuple&quot; error in AvatarProfileForm.Meta.fields attribute. Changed it to a tuple and it worked.

blocks|key|316727|text|对于最初的发帖人来说，这个答案可能太晚了，但我认为它可能会对其他人有所帮助。我也遇到了同样的问题，我确实注意到可以在clean()方法中访问self.cleaned_data('artist_id')，但不能在clean_artist()方法中访问。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|316728|当我在Meta的‘field’声明中添加额外的字段时，它起作用了。|316729|++++class+Meta:
++++++++model+=+Music
++++++++fields=[...,+'artist_id']|code-block|syntax|javascript|316730|您应该能够在clean_artist()中访问self.cleaned_data('artist_id')。|316731|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

This answer may be too late for the original poster, but I thought it might help others. I had the same problem and I did notice that self.cleaned_data('artist_id') can be accessed in the clean() method, but not in the clean_artist(). 

When I added the extra fields in the 'fields' declaration of Meta, then it worked.

<pre><code> class Meta:
 model = Music
 fields=[..., 'artist_id']
</code></pre>

You should be able to access the self.cleaned_data('artist_id') in clean_artist().

blocks|key|317766|text|我有一个非常类似的问题，只是看起来我做了所有需要做的事情，但当Django启动时，我得到了这个错误：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|317767|django.core.exceptions.FieldError:+Unknown+field(s)+(my_new_field)+specified+for+MyModel|code-block|syntax|javascript|317768|这是我犯的一个愚蠢的错误，我不小心使用了窗口小部件类声明了我的字段：|offset|length|style|BOLD|317769|class+MyForm(forms.ModelForm):
++++my_new_field+=+forms.HiddenInput()|317770|而不是字段类：|317771|class+MyForm(forms.ModelForm):
++++my_new_field+=+forms.CharField(widget=forms.HiddenInput())|317772|这里没有回答手头的问题(已经回答得很好了)，但可能会对其他人有所帮助。|317773|entityMap^0|0|0|K|5|0|0|3|2|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@$I|Z|J|10|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|12|8|@$I|13|J|14|K|L]]|9|@]|A|$]]|$1|Q|3|R|5|D|7|15|8|@]|9|@]|A|$E|F]]|$1|S|3|T|5|6|7|16|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|V|$]]

I had a very similar problem except it looked like I did all the required thing, but I was getting this error when Django was starting:

<pre><code>django.core.exceptions.FieldError: Unknown field(s) (my_new_field) specified for MyModel
</code></pre>

This was a silly mistake from me, I accidentally declared my field using a Widget class:

<pre><code>class MyForm(forms.ModelForm):
 my_new_field = forms.HiddenInput()
</code></pre>

Instead of a Field class:

<pre><code>class MyForm(forms.ModelForm):
 my_new_field = forms.CharField(widget=forms.HiddenInput())
</code></pre>

Not answering the question at hand here (which is answered well already), but might help others.

blocks|key|317777|text|首先在表单中添加字段|type|unstyled|depth|inlineStyleRanges|entityRanges|data|317778|class+CreateForm(forms.ModelForm):

extra_field+++++=+forms.CharField(label+=+'extra_field',+required+=+False)|code-block|syntax|javascript|317779|现在，在清理数据时，您需要从self.data+而不是+self.cleaned_data检索额外的字段|offset|length|style|BOLD|317780|正确的|317781|+self.data.get('extra_field')|317782|错误的|317783|+self.cleaned_data.get('extra_field')|317784|entityMap^0|0|0|O|3|0|0|3|0|0|0|3|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@$I|Z|J|10|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|11|8|@$I|12|J|13|K|L]]|9|@]|A|$]]|$1|O|3|P|5|D|7|14|8|@]|9|@]|A|$E|F]]|$1|Q|3|R|5|6|7|15|8|@$I|16|J|17|K|L]]|9|@]|A|$]]|$1|S|3|T|5|D|7|18|8|@]|9|@]|A|$E|F]]|$1|U|3|-4|5|6|7|19|8|@]|9|@]|A|$]]]|V|$]]

First add the field in the form

<pre><code>class CreateForm(forms.ModelForm):

extra_field = forms.CharField(label = 'extra_field', required = False)
</code></pre>

Now while cleaning you data, you need to retrive the extra field from self.data NOT self.cleaned_data

Correct:

<pre><code> self.data.get('extra_field')
</code></pre>

Wrong:

<pre><code> self.cleaned_data.get('extra_field')
</code></pre>

blocks|key|317791|text|在Django+2中，您可以像添加普通表单一样添加字段|type|unstyled|depth|inlineStyleRanges|entityRanges|data|317792|class+CreateCompanyForm(forms.ModelForm):

++++password_confirmation+=+forms.CharField(
++++++++label=translate('Password+confirmation'),
++++++++max_length=70,
++++++++widget=forms.PasswordInput(),
++++++++required=True,
++++)
++++company_name+=+forms.CharField(
++++++++label="Nombre+de+la+Compañía",
++++++++max_length=90,
++++++++widget=forms.TextInput(),
++++++++required=True,
++++)

++++class+Meta:
++++++++model+=+AppUser
++++++++fields+=+(
++++++++++++"email",
++++++++++++"first_name",
++++++++++++"last_name",
++++++++++++"password",
++++++++)|code-block|syntax|javascript|317793|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

In Django 2 you can just add the fields as it was a normal form 

<pre><code>class CreateCompanyForm(forms.ModelForm):

 password_confirmation = forms.CharField(
 label=translate('Password confirmation'),
 max_length=70,
 widget=forms.PasswordInput(),
 required=True,
 )
 company_name = forms.CharField(
 label="Nombre de la Compañía",
 max_length=90,
 widget=forms.TextInput(),
 required=True,
 )

 class Meta:
 model = AppUser
 fields = (
 "email",
 "first_name",
 "last_name",
 "password",
 )
</code></pre>

I have done a ModelForm adding some extra fields that are not in the model. I use these fields for some calcualtions when saving the form.

The extra fields appear on the form and they are sent in the POST request when uploading the form. The problem is they are not added to the <code>cleaned_data</code> dictionary when I validate the form. How can I access them?

Django ModelForm with extra fields that are not in the model

Django

我做了一个ModelForm，在模型中添加了一些不是的额外字段。在保存表单时，我使用这些字段进行一些计算。额外的字段出现在表单上，并在上传表单时在POST请求中发送。问题是，当我验证表单时，它们没有添加到cleaned_data字典中。我如何访问它们？

问Django ModelForm包含模型中没有的额外字段
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