Django - Change the max_length error message on a CharField TextInput

Question

I am trying to customize the error message displayed when a user inputs text longer than the max length for a CharField in my model. The model defines the field as follows:

name = models.CharField(max_length=200)

I have a ModelForm for this model that defines the form field as follows:

name = forms.CharField(widget=forms.TextInput(attrs={'class':"span8", 'placeholder':'e.g. How do I setup a wi-fi network? How to sync my iPhone with iCloud?'}), error_messages={'required': 'Please enter a question.', 'max_length': 'Your question is too long.'})

This works fine for the 'required' error message, but the 'max_length' error message still uses Django's default message here. Am I doing something wrong or should this text be customized in some other way?

okm · Accepted Answer · 2012-05-02 16:26:32Z

3

The 'max_length' is checked by 'django.core.validators.MaxLengthValidator', which has hard-coded error message. You could replace it w/ your own version by:

# after the name or ModelForm definition name.validators[-1].message = 'Your question is too long.'

answered May 2, 2012 at 16:26

okm

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2 Comments

Jamie Forrest Over a year ago

That worked, but after the name definition in the Model. I tried putting it after the name definition in the ModelForm but at that point name.validators is an empty list.

okm Over a year ago

@JamieForrest The validator only applied for form.CharField having not None max_length. You could check isinstance(validator, MaxLengthValidator) for validator inside validators instead of hard-coded [-1] also

rtbortolin · Accepted Answer · 2016-06-18 15:25:38Z

I'm not sure from which version it is working, but now you can do this:

class YouForm(forms.ModelForm): def __init__(self, *args, **kwargs): self.fields['you_field'].error_messages = {'max_length': 'Ensure this value has at most %(limit_value)d character (it has %(show_value)d).'}

MOHRE · Accepted Answer · 2016-07-16 20:33:59Z

You can create subclass of 'django.core.validators.MaxLengthValidator'

from django.core.validators import MaxValueValidator class MyValidator(MaxValueValidator): message = 'Your question is too long.'

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