django formfield_overrides conflicts with max_length in TextField

Question

So I have a model where one of the fields goes like this:

dirlab_cruce = models.CharField(verbose_name='Cruce', max_length=40, null=True, blank=True)

To be able to have all the textfields in the same length i did this in admin.py:

formfield_overrides = { models.CharField: {'widget': TextInput(attrs={'size':'100%'})} }

This made all the textfields tha same width as the form, but limits the text I can input to 4 characters.

Commenting the formfield_overrides block gives me a 40 character input like I wanted, the it shortens the charfield.

Am I doing something wrong?

Thanks

Joe Golton · Accepted Answer · 2013-03-28 18:47:27Z

I had the same issue. It's a Django 1.4 bug, so I just filed a report. Here's the ticket I filed, with an easy way to recreate the bug:

title: using formfield_overrides to set CharField size causes all admin fields to use last max_length in model definition

description: See how title and ISBN are defined with max_length of 100 and 14. The override cause both fields to have max_length of 14 with respect to a user who is editing in the change form - a 15th character cannot be inserted into the title field.

models.py:

from django.db import models class Book(models.Model): title = models.CharField(max_length=100,blank=True, null=True) ISBN13 = models.CharField(max_length=14,unique=True) def __unicode__(self): return self.title

admin.py:

from django.contrib import admin from django.db import models from django.forms import TextInput from books.models import Book class BookAdmin(admin.ModelAdmin): formfield_overrides = { # Django enforces maximum field length of 14 onto 'title' field when user is editing in the change form models.CharField: {'widget': TextInput(attrs={'size':'30'})}, }

admin.site.register(Book,BookAdmin)

EDIT: Within 48 hours of my bug submission, the amazing Django community verified the bug and issued a patch. I tested and confirmed that this bug was fixed in Django 1.5, which was released in March, 2013.

https://code.djangoproject.com/ticket/19423#ticket

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