Django - Empty admin form of Model

Question

I have one model "Inventario" like this:

class Inventario(models.Model):
    producto = models.ForeignKey(Producto)
    cantidad = models.DecimalField(default=0, decimal_places=2, max_digits=10)
    ubicacion = models.ForeignKey(Ubicacion, null=True, blank=True, related_name='en_inventario')
    epc = models.CharField(max_length=25)
    serial = models.CharField(max_length=35)
    fecha = models.DateTimeField(auto_now_add=True)

    def __unicode__(self):
        return '%s (%s)' % (self.producto.item, self.epc)

and registered in the admin.py like this:

from almacen.models import Inventario
admin.site.register(Inventario)

The List of Entries are shown in the Admin

But inside the details of one of that entries, nothing appears

Even if I try to save and continue, an error is thrown

What is happening? This error is affecting only this Model

What version of Django are you using?

RevolutionTech
– RevolutionTech

2015-10-08 18:32:34 +00:00
Commented Oct 8, 2015 at 18:32 — RevolutionTech
– RevolutionTech, Commented Oct 8, 2015 at 18:32

Sarah Messer · Accepted Answer · 2018-01-04 20:01:25Z

2

You probably can't use the default admin.py. Turn on DEBUG and try something like this:

from django.contrib import admin
from almacen.models import Inventario

class InventarioAdmin(admin.ModelAdmin):
    readonly_fields = ['producto', 'fecha', 'ubicacion']

admin.site.register(Inventario, InventarioAdmin)

I suspect that something (the ForeignKey? the auto_now_add field?) isn't being well-handled by the default Admin. Try shrinking the number of fields available.

1 Comment

Alex Lord Mordor Over a year ago

You were right, one of the Foreign Key fields were doing a mess, I had an error in the unicode of one of the ForeignKeyFields, the strange thing is that the DEBUG doesn't show anything. Thnks

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