Django admin: How to display a field that is marked as editable=False' in the model?

Question

Use Readonly Fields. Like so (for django >= 1.2):

class MyModelAdmin(admin.ModelAdmin):
    readonly_fields=('first',)

Update

This solution is useful if you want to keep the field editable in Admin but non-editable everywhere else. If you want to keep the field non-editable throughout then @Till Backhaus' answer is the better option.

Original Answer

One way to do this would be to use a custom ModelForm in admin. This form can override the required field to make it editable. Thereby you retain editable=False everywhere else but Admin. For e.g. (tested with Django 1.2.3)

# models.py
class FooModel(models.Model):
    first = models.CharField(max_length = 255, editable = False)
    second  = models.CharField(max_length = 255)

    def __unicode__(self):
        return "{0} {1}".format(self.first, self.second)

# admin.py
class CustomFooForm(forms.ModelForm):
    first = forms.CharField()

    class Meta:
        model = FooModel
        fields = ('second',)

class FooAdmin(admin.ModelAdmin):
    form = CustomFooForm

admin.site.register(FooModel, FooAdmin)

Your read-only fields must be in fields also:

fields = ['title', 'author', 'content', 'published_date', 'updated_date', 'created_date']
readonly_fields = ('published_date', 'updated_date', 'created_date')

You could also set the readonly fields as editable=False in the model (django doc reference for editable here). And then in the Admin overriding the get_readonly_fields method.

# models.py
class MyModel(models.Model):
  first = models.CharField(max_length=255, editable=False)

# admin.py
class MyModelAdmin(admin.ModelAdmin):
  def get_readonly_fields(self, request, obj=None):
    return [f.name for f in obj._meta.fields if not f.editable]