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POHow to Dynamically Access Fields from Foreign Key in Django Admin
 

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  1. POHow to Dynamically Access Fields from Foreign Key in Django Admin
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    <p>So I have models like this:</p> <pre><code>class Celebrity(models.Model): #30+ fields here ... class HoneyBadger(models.Model): name = models.CharField(max_length=10) celebrity_owner = models.ForeignKey(Celebrity) </code></pre> <p>Now I want the admin interface for HoneyBadger to show the name of the creature plus the celebrity owner fields.</p> <p>I know the standard advice is to do something like this:</p> <pre><code>class HoneyBadger(models.Model): name = models.CharField(max_length=10) celebrity_owner = models.ForeignKey(Celebrity) def owner_birth_date(self): return self.celebrity_owner.birth_date #And so on for every other field in celebrity_owner </code></pre> <p>And then reference those methods in the admin.</p> <p>Instead I want a way to save myself all that typing!</p> <p>Here's my first attempt at a lazy shortcut:</p> <pre><code>class HoneyBadger(models.Model): name = models.CharField(max_length=10) celebrity_owner = models.ForeignKey(Celebrity) def __getattr__(self, name): """Dynamically make derived fields for celebrity_owner fields so I don't have to type out""" field_lookup_prefix = 'celebrity_owner_field_' if name.startswith(field_lookup_prefix): field_name = name[len(field_lookup_prefix):] def wrapper(*args, **kwargs): return getattr(self.celebrity_owner, field_name) return wrapper else: raise AttributeError('%s not found' % name) </code></pre> <p>That does work when I run it in the shell, but the Django admin isn't liking it. I get this error:</p> <pre><code>ImproperlyConfigured at /admin/tracker/ HoneyBadgerAdmin.list_display[5], 'celebrity_owner_field_birth_date' is not a callable or an attribute of 'HoneyBadgerAdmin' or found in the model 'HoneyBadger'. </code></pre> <p>Does anyone know how I can make my code work with the admin or if there's another way to save typing out a method for every single celebrity field? (Perhaps some kind of runtime monkey patching?)</p>
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    1. COif it is just to display those fields you can use the __unicode__() method
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