I have a few models having User as Foreign Key. The User list is displaying the username, but I'd like to customize it. Do I have to extend the User model with a custom model and write my own __str__ function? Is there an easier way? I don't think you can use a callable for fieldset, right?
4 Answers
Answers 1
I think __unicode__() method is not the correct, you should use __str__() method.
For Python 2.x, __str__() method will return str(bytes) and __unicode__() method will return unicode (text).
The print statement and the str built-in call
__str__()to determine the human-readable representation of an object. The unicode built-in calls__unicode__()if it exists, and otherwise falls back to__str__()and decodes the result with the system encoding. Conversely, the Model base class automatically derives__str__()from__unicode__()by encoding to UTF-8. read here complete
But in Python 3.x there is just __str__(), no __unicode__() method.
Django provides a simple way to define
__str__()and__unicode__()methods that work on Python 2 and 3: you must define a__str__()method returning text and to apply the python_2_unicode_compatible() decorator.On Python 3, the decorator is a no-op. On Python 2, it defines appropriate
__unicode__()and__str__()methods (replacing the original__str__()method in the process).
Here is an example from django docs.
from django.utils.encoding import python_2_unicode_compatible @python_2_unicode_compatible class MyClass(object): def __str__(self): return "Instance of my class" SOLUTION : Decorate in the same way, as done above for your Class and in models.py, add a method which will be get added to the User model.
from django.contrib.auth.models import User def get_name(self): return '{} {}'.format(self.first_name, self.last_name) User.add_to_class("__str__", get_name) Answers 2
You can change the string representation of the Django default User by overriding the User __unicode__ method. Add the code below somewhere in your app, perhaps in models.py
def custom_user_display(self): return self.email + ', ' self.first_name # write your representation here User.add_to_class("__unicode__", custom_user_display) # override the __unicode__ method Answers 3
Assume you have a model like this
class UserProfile(models.Model): user = models.OneToOneField(User, unique=True, verbose_name=_('user'), related_name='profile') city = models.CharField(max_length=128, null=True, blank=True) And you want to show the user's email instead of username or userid in admin page, then you can do something like this
class UserProfileAdmin(admin.ModelAdmin): list_display = ('get_user', 'city') def get_user(self, obj): return obj.user.email get_user.short_description = 'User' get_user.admin_order_field = 'user__id' Answers 4
ForeignKeys in Django forms are represented by ModelChoiceFields. The ModelChoiceField class has a label_from_instance method, which decides how to render the choice. So in order to change this representation in the Admin, you need to modify this form field.
Here is a simple example.
class MyModelAdmin(admin.ModelAdmin): def formfield_for_foreignkey(self, db_field, request, **kwargs): field = super(MyModelAdmin, self).formfield_for_foreignkey(db_field, request, **kwargs) if db_field.name == "user": field.label_from_instance = lambda u: "My Object #%i" % u.id return field 
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