Give our models meaningful reprs.

>>> from zephyr.models import UserProfile, Recipient, Zephyr, ZephyrClass
>>> for klass in [UserProfile, Recipient, Zephyr, ZephyrClass]:
...     print klass.objects.all()[:2]
...
[<UserProfile: othello>, <UserProfile: iago>]
[<Recipient: Verona (1, class)>, <Recipient: Denmark (2, class)>]
[<Zephyr: Scotland / Scotland3 / <UserProfile: prospero>>, <Zephyr: Venice / Venice3 / <UserProfile: iago>>]
[<ZephyrClass: Verona>, <ZephyrClass: Denmark>]

(imported from commit 9998ffe40800213a5425990d6e85f5c5a43a5355)

zephyr/models.py

@@ -2,17 +2,41 @@ from django.db import models
 from django.contrib.auth.models import User
 from django.db.models.signals import post_save
 
+def get_display_recipient(recipient):
+    """
+    recipient: an instance of Recipient.
+
+    returns: an appropriate string describing the recipient (the class
+    name, for a class, or the username, for a user).
+    """
+    if recipient.type == "class":
+        zephyr_class = ZephyrClass.objects.get(pk=recipient.user_or_class)
+        return zephyr_class.name
+    else:
+        user = User.objects.get(pk=recipient.user_or_class)
+        return user.username
+
 class UserProfile(models.Model):
     user = models.OneToOneField(User)
     pointer = models.IntegerField()
 
+    def __repr__(self):
+        return "<UserProfile: %s>" % (self.user.username,)
+
 class ZephyrClass(models.Model):
     name = models.CharField(max_length=30)
 
+    def __repr__(self):
+        return "<ZephyrClass: %s>" % (self.name,)
+
 class Recipient(models.Model):
     user_or_class = models.IntegerField()
     type = models.CharField(max_length=30)
 
+    def __repr__(self):
+        display_recipient = get_display_recipient(self)
+        return "<Recipient: %s (%d, %s)>" % (display_recipient, self.user_or_class, self.type)
+
 class Zephyr(models.Model):
     sender = models.ForeignKey(UserProfile)
     recipient = models.ForeignKey(Recipient) # personal or class
@@ -20,6 +44,10 @@ class Zephyr(models.Model):
     content = models.CharField(max_length=200)
     pub_date = models.DateTimeField('date published')
 
+    def __repr__(self):
+        display_recipient = get_display_recipient(self.recipient)
+        return "<Zephyr: %s / %s / %r>" % (display_recipient, self.instance, self.sender)
+
 def create_user_profile(**kwargs):
     """When creating a new user, make a profile for him or her."""
     u = kwargs["instance"]