adding an amo compatiblity model and translation helpers

apps/amo/__init__.py

@@ -1,3 +1,5 @@
 """
 Miscellaneous helpers that make Django compatible with AMO.
 """
+
+from .models import LegacyModel, TranslatedField

apps/amo/models.py

@@ -0,0 +1,32 @@
+from django.db import models
+
+
+class LegacyModel(models.Model):
+    """Adds automatic created and modified fields to the model."""
+    created = models.DateTimeField(auto_now_add=True)
+    modified = models.DateTimeField(auto_now=True)
+
+    class Meta:
+        abstract = True
+
+
+class TranslatedField(models.IntegerField):
+    __metaclass__ = models.SubfieldBase
+
+    def to_python(self, value):
+        locale = 'en-US'
+        q = Translation.objects.filter(id=value, locale=locale)
+        v = q.values_list('localized_string', flat=True)
+        return v[0] if v else value
+
+
+# Putting Translation in here since TranslatedField depends on it.
+class Translation(LegacyModel):
+
+    autoid = models.AutoField(primary_key=True)
+    id = models.IntegerField()
+    locale = models.CharField(max_length=10)
+    localized_string = models.TextField()
+
+    class Meta:
+        db_table = 'translations'

settings.py

@@ -84,6 +84,8 @@ TEMPLATE_DIRS = (
 )
 
 INSTALLED_APPS = (
+    'amo',
+
     'django.contrib.auth',
     'django.contrib.contenttypes',
     'django.contrib.sessions',