Initial entry of models

project_directory/common/admin.py

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+from django.contrib import admin
+from common.models import Category, Sample
+
+admin.site.register(Category)
+admin.site.register(Sample)

project_directory/common/migrations/0001_initial.py

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+# -*- coding: utf-8 -*-
+import datetime
+from south.db import db
+from south.v2 import SchemaMigration
+from django.db import models
+
+
+class Migration(SchemaMigration):
+
+    def forwards(self, orm):
+        # Adding model 'Category'
+        db.create_table(u'common_category', (
+            (u'id', self.gf('django.db.models.fields.AutoField')(primary_key=True)),
+            ('name', self.gf('django.db.models.fields.CharField')(max_length=100)),
+            ('active', self.gf('django.db.models.fields.BooleanField')(default=True)),
+            ('parent', self.gf('django.db.models.fields.related.ForeignKey')(to=orm['common.Category'], null=True, on_delete=models.SET_NULL, blank=True)),
+        ))
+        db.send_create_signal(u'common', ['Category'])
+
+        # Adding model 'Sample'
+        db.create_table(u'common_sample', (
+            (u'id', self.gf('django.db.models.fields.AutoField')(primary_key=True)),
+            ('name', self.gf('django.db.models.fields.CharField')(max_length=100)),
+            ('active', self.gf('django.db.models.fields.BooleanField')(default=True)),
+            ('parent', self.gf('django.db.models.fields.related.ForeignKey')(to=orm['common.Category'], null=True, on_delete=models.SET_NULL, blank=True)),
+        ))
+        db.send_create_signal(u'common', ['Sample'])
+
+
+    def backwards(self, orm):
+        # Deleting model 'Category'
+        db.delete_table(u'common_category')
+
+        # Deleting model 'Sample'
+        db.delete_table(u'common_sample')
+
+
+    models = {
+        u'common.category': {
+            'Meta': {'object_name': 'Category'},
+            'active': ('django.db.models.fields.BooleanField', [], {'default': 'True'}),
+            u'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '100'}),
+            'parent': ('django.db.models.fields.related.ForeignKey', [], {'to': u"orm['common.Category']", 'null': 'True', 'on_delete': 'models.SET_NULL', 'blank': 'True'})
+        },
+        u'common.sample': {
+            'Meta': {'object_name': 'Sample'},
+            'active': ('django.db.models.fields.BooleanField', [], {'default': 'True'}),
+            u'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '100'}),
+            'parent': ('django.db.models.fields.related.ForeignKey', [], {'to': u"orm['common.Category']", 'null': 'True', 'on_delete': 'models.SET_NULL', 'blank': 'True'})
+        }
+    }
+
+    complete_apps = ['common']

project_directory/common/models.py

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+from django.db import models
+
+
+class CommonInfo(models.Model):
+    name = models.CharField(max_length=100)
+    active = models.BooleanField(default=True)
+
+    def __unicode__(self):
+        return self.name
+
+    class Meta:
+        abstract = True
+
+
+class Category(CommonInfo):
+    parent = models.ForeignKey('self', blank=True, null=True,
+                               on_delete=models.SET_NULL)
+
+
+class Sample(CommonInfo):
+    parent = models.ForeignKey(Category, blank=True, null=True,
+                               on_delete=models.SET_NULL)

project_directory/common/tests.py

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+"""
+This file demonstrates writing tests using the unittest module. These will pass
+when you run "manage.py test".
+
+Replace this with more appropriate tests for your application.
+"""
+
+from django.test import TestCase
+
+
+class SimpleTest(TestCase):
+    def test_basic_addition(self):
+        """
+        Tests that 1 + 1 always equals 2.
+        """
+        self.assertEqual(1 + 1, 2)

project_directory/common/views.py

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+# Create your views here.